Thematische Bibliographien / AGN activity

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Auswahl der wissenschaftlichen Literatur zum Thema „AGN activity“

Autor: Grafiati

Veröffentlicht am 26. Juni 2021

Zuletzt aktualisiert am 17. Februar 2022

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Zeitschriftenartikel zum Thema "AGN activity"

Umemura, Masayuki, Jun Fukue und Shin Mineshige. „AGN activity triggered by circumnuclear starbursts“. Advances in Space Research 23, Nr. 5-6 (Januar 1999): 1095–100. http://dx.doi.org/10.1016/s0273-1177(99)00238-0.

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Li, Cheng, Guinevere Kauffmann, Timothy M. Heckman, Simon D. M. White und Y. P. Jing. „Interactions, star formation and AGN activity“. Monthly Notices of the Royal Astronomical Society 385, Nr. 4 (April 2008): 1915–22. http://dx.doi.org/10.1111/j.1365-2966.2008.13023.x.

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Amiri, Amirnezam. „Role of environment on AGN activity“. Proceedings of the International Astronomical Union 15, S356 (Oktober 2019): 171. http://dx.doi.org/10.1017/s1743921320002835.

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AbstractMotivated by the apparently conflicting results reported in the literature on the effect of environment on nuclear activity, we have carried out a new analysis by comparing the fraction of galaxies hosting active galactic nuclei (AGNs) in the most overdense regions (rich galaxy clusters) and the most underdense ones (voids) in the local universe. Exploiting the classical BPT diagnostics, we have extracted volume limited samples of star forming and AGN galaxies. We find that, at variance with star-forming galaxies, AGN galaxies have similar distributions of specific star formation rates and of galactic ages (as indicated by the Dn4000 parameter) both in clusters and in voids. In both environments galaxies hosting AGNs are generally old, with low star formation activity. The AGN fraction increases faster with stellar mass in clusters than in voids, especially above 1010.2 M⊙. Our results indicate that, in the local universe, the nuclear activity correlates with stellar mass and galaxy morphology and is weakly, if at all, affected by the local galaxy density.

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Man, Zhong-yi, Ying-jie Peng, Xu Kong, Ke-xin Guo, Cheng-peng Zhang und Jing Dou. „The dependence of AGN activity on environment in SDSS“. Monthly Notices of the Royal Astronomical Society 488, Nr. 1 (20.06.2019): 89–98. http://dx.doi.org/10.1093/mnras/stz1706.

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ABSTRACT Environment is one of the key external drivers of the galaxies, while active galactic nucleus (AGN) is one of the key internal drivers. Both of them play fundamental roles in regulating the formation and evolution of galaxies. We explore the interrelationship between environment and AGN in SDSS. At a given stellar mass, the specific star formation rate distribution of the AGN host galaxies remains unchanged with overdensity, with the peak of the distribution around the Green Valley. We show that, at a given stellar mass, the AGN fraction that has been commonly used in previous studies (defined as the number of AGNs relative to all galaxies including passive and star forming ones) does decrease with increasing overdensity for satellites. This is largely due to the fact that the fraction of passive galaxies strongly depends on environment. In order to investigate the intrinsic correlation between AGN and environment, especially under the assumption that AGN feedback is responsible for star formation quenching, the AGN fraction should be defined as the number of AGNs relative to the star-forming galaxies only. With the new definition, we find little dependence of AGN fraction on overdensity, central/satellite, and group halo mass. There is only marginal evidence that AGN may prefer denser regions, which is possibly due to more frequent interaction of galaxies or higher merger rate in groups. Our results support the scenario that internal secular evolution is the predominant mechanism of triggering AGN activity, while external environment related processes only play a minor role.

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González Delgado, R. M., C. N. Tadhunter, E. Pérez, M. Villar-Martín, J. Holt und J. Rodríguez. „The relation between mergers and AGN activity“. Astronomische Nachrichten 327, Nr. 2-3 (März 2006): 159–66. http://dx.doi.org/10.1002/asna.200510499.

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De Rosa, A., S. Bianchi, T. Bogdanović, R. Decarli, J. Heidt, R. Herrero-Illana, B. Husemann et al. „Unveiling multiple AGN activity in galaxy mergers“. Astronomische Nachrichten 338, Nr. 2-3 (März 2017): 262–68. http://dx.doi.org/10.1002/asna.201713340.

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Noordeh, E., R. E. A. Canning, A. King, S. W. Allen, A. Mantz, R. G. Morris, S. Ehlert et al. „The environmental dependence of X-ray AGN activity at z ∼ 0.4“. Monthly Notices of the Royal Astronomical Society 498, Nr. 3 (07.09.2020): 4095–108. http://dx.doi.org/10.1093/mnras/staa2682.

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ABSTRACT We present an analysis of the X-ray active galactic nucleus (AGN) population in a sample of seven massive galaxy clusters in the redshift range 0.35 < z < 0.45. We utilize high-quality Chandra X-ray imaging to robustly identify AGN and precisely determine cluster masses and centroids. Follow-up VIsible Multi-Object Spectrograph optical spectroscopy allows us to determine which AGN are cluster members. Studying the subset of AGN with 0.5–8 keV luminosities >6.8 × 1042 erg s−1, within r ≤ 2r500 (approximately the virial radius), we find that the cluster AGN space density scales with cluster mass as $\sim M^{-2.0^{+0.8}_{-0.9}}$. This result rules out zero mass dependence of the cluster X-ray AGN space density at the 2.5σ level. We compare our cluster X-ray AGN sample to a control field with identical selection and find that the cluster AGN fraction is significantly suppressed relative to the field when considering the brightest galaxies with V < 21.5. For fainter galaxies, this difference is not present. Comparing the X-ray hardness ratios of cluster member AGN to those in the control field, we find no evidence for enhanced X-ray obscuration of cluster member AGN. Lastly, we see tentative evidence that disturbed cluster environments may contribute to enhanced AGN activity.

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Farrah, D., J. Afonso, A. Efstathiou, M. Rowan-Robinson, M. Fox und D. Clements. „Starburst and AGN activity in ultraluminous infrared galaxies“. Monthly Notices of the Royal Astronomical Society 343, Nr. 2 (01.08.2003): 585–607. http://dx.doi.org/10.1046/j.1365-8711.2003.06696.x.

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Blank, Marvin, und Wolfgang J. Duschl. „Viscous time lags between starburst and AGN activity“. Monthly Notices of the Royal Astronomical Society 462, Nr. 2 (28.07.2016): 2246–55. http://dx.doi.org/10.1093/mnras/stw1804.

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Foord, Adi, Elena Gallo, Edmund Hodges-Kluck, Brendan P. Miller, Vivienne F. Baldassare, Kayhan Gültekin und Oleg Y. Gnedin. „AGN Activity in Nucleated Galaxies as Measured byChandra“. Astrophysical Journal 841, Nr. 1 (23.05.2017): 51. http://dx.doi.org/10.3847/1538-4357/aa6d63.

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Dissertationen zum Thema "AGN activity"

Blank, Marvin, und Wolfgang J. Duschl. „Viscous time lags between starburst and AGN activity“. OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/621734.

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There is strong observational evidence indicating a time lag of order of some 100 Myr between the onset of starburst and AGN activity in galaxies. Dynamical time lags have been invoked to explain this. We extend this approach by introducing a viscous time lag the gas additionally needs to flow through the AGN's accretion disc before it reaches the central black hole. Our calculations reproduce the observed time lags and are in accordance with the observed correlation between black hole mass and stellar velocity dispersion.

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Molnár, Dániel Csaba. „Tracing star formation and AGN activity at radio frequencies“. Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/79453/.

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My research has focused on locating and measuring star formation and AGN activity in different environments with interferometric and single-dish radio observations. As my first PhD project, I studied the complex interaction between an intermediate redshift (z 0.3) starburst galaxy and a nearby ( 7 kpc separation) QSO using sub-arcsecond VLA observations. I found new evidence for jet-induced star formation activity in the companion galaxy, making the system a strong candidate for this rare, and potentially important process in the early Universe. In my second paper, I investigated the infrared-radio correlation (IRRC) of spheroid- and disc-dominated galaxies in the COSMOS field out to z 1.5. With 1.4 GHz data and Herschel photometry I found that the redshift evolution reported in recent works is due to an increasing radio excess emission associated with spheroid-dominated galaxies, compared to disc-dominated ones, i.e. the ‘purest' star-forming systems in our sample. I theorize that the extra radio power in spheroid-dominated systems is due to low-level AGN activity, even though these sources were not identified by most commonly-used diagnostics as AGN hosts. This finding will significantly increase the accuracy of future high-redshift radio surveys measuring star formation. In my third project I assembled and analysed the largest-to-date low-z IRRC sample of galaxies. I demonstrated the importance of selection effects influencing IRRC statistics, and carried out an improved IRRC analysis that yielded more accurate measures of the correlation's properties. With rich ancillary data it will provide insight into the physical processes that give rise to the IRRC. Finally, I adopted an MCMC-based model optimization to fit a radiative transfer model to ammonia line spectra of a binary molecular cloud core. I determined the physical structures and the masses of the cores and found they are gravitationally unbound.

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Omma, Henrik Nilsen. „Jet-powered cooling cores : reversing cooling flows through AGN activity“. Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419330.

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Laporte, Nicolas, Kimihiko Nakajima, Richard S. Ellis, Adi Zitrin, Daniel P. Stark, Ramesh Mainali und G. W. Roberts-Borsani. „A Spectroscopic Search for AGN Activity in the Reionization Era“. IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626417.

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The ubiquity of Lyman alpha (Ly alpha) emission in a sample of four bright [O III]- strong star-forming galaxies with redshifts above seven has led to the suggestion that such luminous sources represent a distinct population compared with their fainter, more numerous counterparts. The presence of Lya emission within the reionization era could indicate that these sources created early ionized bubbles due to their unusually strong radiation, possibly because of the presence of active galactic nuclei. To test this hypothesis, we secured long integration spectra with XSHOOTER on the VLT for three z similar or equal to 7 sources selected to have similar luminosities and prominent excess fluxes in the IRAC 3.6 or 4.5 mu m band, usually attributed to strong [O III] emission. We secured additional spectroscopy for one of these galaxies at z = 7.15 using MOSFIRE at the Keck telescope. For the most well-studied source in our sample with the strongest IRAC excess, we detect significant nebular emission from He II and N V indicative of a non-thermal source. For the other two sources at z = 6.81 and z = 6.85, for which no previous optical/near-infrared spectroscopy was available, Ly alpha is seen in one and C III] emission in the other. Although based on a modest sample, our results further support the hypothesis that the phenomenon of intense [O III] emission is associated preferentially with sources lying in early ionized bubbles. However, even though one of our sources at z = 7.15 suggests the presence of non-thermal radiation, such ionized bubbles may not uniquely arise in this manner. We discuss the unique advantages of extending such challenging diagnostic studies with JWST.

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Kolwa, Sthabile. „The effects of environment on radio-loud AGN activity in Stripe 82“. University of the Western Cape, 2016. http://hdl.handle.net/11394/5318.

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>Magister Scientiae - MSc
We investigate the link between environment and radiative accretion efficiency using a sample of 8946 radio-loud AGN detected at 1 − 2 GHz in the SDSS Stripe 82 region. We quantify their environments using the surface-density parameter, ƩN, which measures galaxy density based on distances to Nth nearest neighbours. Comparing Ʃ2 and Ʃ5 between AGN and control galaxies, we obtain relative densities that quantify the degree of galaxy clustering around each AGN. Using this, we examine the relation between density and the HERG-LERG dichotomy (accretion-modes) classified using a 1.4 GHz luminosity (L1.4GHz) threshold. Our results indicate that, in the low-redshift interval (0.1 < z < 0.2), LERGs occupy environments denser than the field. At intermediate redshifts (0.2 < z < 1.2), both LERGs and HERGs occupy regions denser than the field. Spearman’s rank tests show that correlations between density and L1.4GHz in both redshift intervals are weak. We conclude that the absence of a strong correlation is confirmation of the idea that galaxy density plays a more secondary role on AGN activity and also, accretion-mode classification (both measured using L1.4GHz). It is likely that the rate of gas accretion or properties of galactic-scale magnetic fields correlate more strongly with L1.4GHz, hence being primarily influential.
National Research Foundation (NRF)

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Ma, Jingzhe, Anthony H. Gonzalez, J. D. Vieira, M. Aravena, M. L. N. Ashby, M. Béthermin, M. S. Bothwell et al. „SPT0346-52: NEGLIGIBLE AGN ACTIVITY IN A COMPACT, HYPER-STARBURST GALAXY AT z = 5.7“. IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622449.

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We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This galaxy has also been observed with ALMA, HST, Spitzer, Herschel, Atacama Pathfinder EXperiment, and the Very Large Telescope. Previous observations indicate that if the infrared (IR) emission is driven by star formation, then the inferred lensing-corrected star formation rate (SFR) (similar to 4500 M-circle dot yr(-1)) and SFR surface density Sigma(SFR) (similar to 2000 M-circle dot yr(-1) kpc(-2)) are both exceptionally high. It remained unclear from the previous data, however, whether a central active galactic nucleus (AGN) contributes appreciably to the IR luminosity. The Chandra upper limit shows that SPT0346-52 is consistent with being star formation dominated in the X-ray, and any AGN contribution to the IR emission is negligible. The ATCA radio continuum upper limits are also consistent with the FIR-to-radio correlation for star-forming galaxies with no indication of an additional AGN contribution. The observed prodigious intrinsic IR luminosity of (3.6 +/- 0.3) x 10(13) L-circle dot originates almost solely from vigorous star formation activity. With an intrinsic source size of 0.61 +/- 0.03 kpc, SPT0346-52 is confirmed to have one of the highest Sigma(SFR) of any known galaxy. This high Sigma(SFR), which approaches the Eddington limit for a radiation pressure supported starburst, may be explained by a combination of very high star formation efficiency and gas fraction.

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Noirot, Gaël. „The CARLA-Hubble survey : spectroscopic confirmation and galaxy stellar activity of rich structures at 1.4 < z < 2.8“. Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC153.

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Les études détaillées d'amas de galaxies confirmés à grands redshifts sont peu nombreuses. L’objectif de cette Thèse est d’établir le premier catalogue d'amas confirmés spectroscopiquement à grand redshift et, pour la première fois à ces redshifts, d’étudier de manière statistique les propriétés des galaxies membres des amas. Dans cette Thèse, nous caractérisons et étudions 20 candidats amas à redshifts 1.4 < z < 2.8 parmi les candidats les plus prometteurs de l’échantillon CARLA. Nous réduisons et analysons des données spectroscopiques grism sans fente et imagerie proche-infrarouge des amas candidats, obtenues avec le télescope spatial Hubble. Nous mesurons plus de 700 redshifts au sein des champs observés, et confirmons spectroscopiquement 16 amas CARLA dans l’intervalle 1.4 < z < 2.8; ces amas sont associés à des noyaux galactiques actifs à fortes émissions radios (RLAGN) en leur centre, par sélection. Cet effort fait plus que doubler le nombre d’amas confirmés à ces redshifts. Nous étudions également le taux de formation stellaire des galaxies membres des amas en fonction de leur masses stellaires, et de la distance aux RLAGN. Nous trouvons que les galaxies membres massives sont situées sous la séquence principale jusqu’à z=2, ce qui suggère déjà à ces redshifts une évolution accélérée des galaxies massives au sein des amas. Nous trouvons également une concentration plus importante de membres actifs à plus petits rayons des RLAGN, jusqu’à z=2. Ceci est en accord avec un renversement de la relation densité vs. taux de formation stellaire pour nos amas CARLA à 1.4 < z < 2.0, ce qui suggère que les amas CARLA représentent une phase de transition de l’évolution des galaxies au sein des amas. Nous étudions également les populations stellaires de deux de nos amas confirmés à redshift z=2.0. Nous analysons les relations couleurs-couleurs et couleurs-magnitudes de ces deux amas et montrons que l’une des structures à z=2 possède une séquence rouge de galaxies passives. Globalement, nos résultats démontrent que les amas CARLA représentent des structures riches comprenant des populations mixtes de galaxies évoluées et massives sans formation stellaire, et des galaxies actives formant des étoiles. Cet échantillon sans précédent de 16 amas confirmés spectroscopiquement dans l’intervalle de redshift 1.4 < z < 2.8 constitue un échantillon idéal pour étudier statistiquement la phase de transition des amas de galaxies, ainsi que les mécanismes de suppression de la formation stellaire. (Abrégé)
Detailed studies of high-redshift confirmed galaxy clusters are based on a few individual objects. In this Thesis, we therefore aim at building the first sample of spectroscopically confirmed clusters at high-redshifts and, for the first time at these redshifts, statistically infer cluster member galaxy properties. In this Thesis, we study and characterize 20 cluster candidates at redshifts 1.4 < z < 2.8, which represent the most promising cluster candidates from the CARLA sample. We reduce and analyze slitless grism spectroscopic and near-infrared imaging data of the fields, obtained with the Hubble Space Telescope. We measure redshifts for over 700 star-forming sources in the 20 fields, and we spectroscopically confirm 16 CARLA clusters in the range 1.4 < z < 2.8; by selection, these clusters are associated with powerful radio-loud active galactic nuclei (RLAGN) at their center. This effort alone more than doubles the number of confirmed clusters at these redshifts. We study cluster member star-formation rates (SFRs) as a function of their stellar masses and distances from the RLAGN. We find that massive members are located below their star-forming main-sequence up to z=2. This implies that the massive star-forming end of the cluster population already followed an accelerated evolution at these high redshifts. We also find an increasing concentration of star-forming members with smaller radii relative to the RLAGN, at all redshifts up to z=2. Our 1.4 < z < 2.0 cluster members are therefore consistent with a reversal of the SFR-density relation. This is a first evidence showing that CARLA clusters represent a transition phase for cluster galaxy evolution. We also study stellar populations of two of our confirmed CARLA clusters at z=2.0. We study their color-color and color-magnitude relations and show that one of the two structures is comprised of a z=2 red sequence of passive candidate members. Together, these results provide clear evidence that our confirmed CARLA clusters represent rich structures comprised of mixed populations, including both evolved, passive, massive galaxies, and galaxies with ongoing star formation. Together, this unprecedented sample of 16 confirmed clusters at 1.4 < z < 2.8 constitutes an ideal sample for further statistical investigation of the cluster transition phase, including study of quenching mechanisms. (Abridged)

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Alberts, Stacey, Alexandra Pope, Mark Brodwin, Sun Mi Chung, Ryan Cybulski, Arjun Dey, Peter R. M. Eisenhardt et al. „STAR FORMATION AND AGN ACTIVITY IN GALAXY CLUSTERS FROM z = 1–2: A MULTI-WAVELENGTH ANALYSIS FEATURING HERSCHEL /PACS“. IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621395.

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We present a detailed, multi-wavelength study of star formation (SF) and active galactic nucleus (AGN) activity in 11 near-infrared (IR) selected, spectroscopically confirmed massive (greater than or similar to 10(14)M(circle dot)) galaxy clusters at 1 < z < 1.75. Using new deep Herschel/PACS imaging, we characterize the optical to far-IR spectral energy distributions (SEDs) for IR-luminous cluster galaxies, finding that they can, on average, be well described by field galaxy templates. Identification and decomposition of AGNs through SED fittings allows us to include the contribution to cluster SF from AGN host galaxies. We quantify the star-forming fraction, dust-obscured SF rates (SFRs) and specific SFRs for cluster galaxies as a function of cluster-centric radius and redshift. In good agreement with previous studies, we find that SF in cluster galaxies at z greater than or similar to 1.4 is largely consistent with field galaxies at similar epochs, indicating an era before significant quenching in the cluster cores (r < 0.5 Mpc). This is followed by a transition to lower SF activity as environmental quenching dominates by z similar to 1. Enhanced SFRs are found in lower mass (10.1< logM(kappa)/M-circle dot < 10.8) cluster galaxies. We find significant variation in SF from cluster to cluster within our uniformly selected sample, indicating that caution should be taken when evaluating individual clusters. We examine AGNs in clusters from z = 0.5-2, finding an excess AGN fraction at z greater than or similar to 1, suggesting environmental triggering of AGNs during this epoch. We argue that our results-a transition from field-like to quenched SF, enhanced SF in lower mass galaxies in the cluster cores, and excess AGNs-are consistent with a co-evolution between SF and AGNs in clusters and an increased merger rate in massive halos at high redshift.

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Zaheer, Farah. „Adaptations in motor unit activity with age and physical activity“. Thesis, Boston University, 2012. https://hdl.handle.net/2144/12693.

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Thesis (Sc.D.)--Boston University PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
The hypothesis that age-related alterations to the morphological properties of a motor unit (MU) are accompanied by modifications in their control properties has been supported by data that compared young (24-37 y.o.) and elderly (65-88 y.o.) adults (Erim et al. J. Neurophys., 1999). The objective of the present dissertation was to characterize whether such modifications in MU control properties are progressive across a continuum of ages from childhood to senescence, and whether such adaptations are muscle and usage dependent. Multiple concurrently active MUs were assayed from the first dorsal interosseous (FDI) and vastus lateralis (VL) muscles in healthy subjects from 8-86 years of age. Surface EMG (sEMG) signals were acquired while the participants isometrically tracked a trapezoidal force trajectory at 20%, 50% and 80% of their maximal voluntary force capacity. Data were decomposed into MU trains using a recently developed sEMG decomposition procedure (De Luca et al. J. Neurophys., 2006; Nawab et al. J Clin. Neurophys., 2010) that provides a much greater yield (typically 3- 6 X) than that of prev1ous needle sensor based technologies. Results from n=65 subjects (representing approximately 5307 analyzed MUs) indicate that the average firing rates of the earliest recruited MU trains were significantly reduced with increasing age (p<0.05)) for both muscles and the three normalized force levels tested. Characteristics of MU behavior in young children were reported for the first time, and demonstrated unique properties compared to findings in adults and the elderly. Additionally, those elderly adults who scored at the high end of a physical activity scale deviated least in their firing rate properties from young adults, demonstrating that habitual physical activity can modify the effects of ageing. These findings indicate an age and usage-dependency to MU control properties that is progressive.

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Mata, Joe I. (Joe Israel). „The Effects of Age-Graded Associations on the Political Activism of the Elderly“. Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc501086/.

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Although the graying of the American society has been well documented, the question as to whether the elderly populace will indeed become a political factor has yet to be determined. Some studies indicate that the elderly will soon develop the consensus needed for political action; other studies counter that the elderly will never be a viable political factor. Among the determinants listed as influencing the political participation equation are standard socioeconomic variables (e.g., race, social status, education, and income). These factors have been studied extensively (Campbell 1960; Key 1950; Milbrath 1965; Nagel 1987; Rose 1965). Trela recently added an item that could possibly influence the political activism of the elderly: membership in age-graded associations. This study addresses the questions raised by Trela (1971), namely, whether age-graded associations influence the political activity of senior citizens, and if so, in what direction elderly participation is swayed. Unlike previous reports, the preliminary data gathered for this study suggest that the age-graded associations of the elderly cannot accurately predict their political activism.

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Bücher zum Thema "AGN activity"

Freedman, B., und B. J. Freedman. A Natural Lizard Activity. U.S.A. eBook: Smashwords, 2010.

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Physical activity and aging. 2. Aufl. Rockville, Md: Aspen Publishers, 1987.

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Shephard, Roy J. Physical activity and aging. 2. Aufl. London: Croom Helm, 1987.

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Canada. Library of Parliament. Parliamentary Research Branch. Canada's legal age of consent to sexual activity. Ottawa: Library of Parliament, 1999.

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Aging, physical activity, and health. Champaign, IL: Human Kinetics, 1997.

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The Robert Wood Johnson Foundation. Increasing physical activity among adults age 50 and older. Princeton, NJ: Robert Wood Johnson Foundation, 2001.

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Billington, Rachel. A woman's age. London: Pan, 1996.

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Pickard, Edited by Victor, und Guobin Yang. Media Activism in the Digital Age. Herausgegeben von Victor Pickard und Guobin Yang. London ; New York : Routledge, 2017.: Routledge, 2017. http://dx.doi.org/10.4324/9781315393940.

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Wadsworth, Gail M. Pamoja: A learning activity for the information age : facilitator's guide. Bahama, N.C: World Library Partnership, 1999.

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Harris, Sara. Physical activity, aging and sports. Albany, NY: Center for the Study of Aging, 1989.

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Buchteile zum Thema "AGN activity"

Stasinska, Grazyna. „Statistical Studies of AGN and QSOs“. In Observational Evidence of Activity in Galaxies, 143–46. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3851-9_22.

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Chatterjee, Tapan K. „Nuclear Activity in Interacting Galaxies“. In Multi-Wavelength Continuum Emission of AGN, 499. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_197.

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Márquez, Isabel, und Josefa Masegosa. „Galaxies Hosting AGN Activity and Their Environments“. In Astrophysics and Space Science Proceedings, 119–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11250-8_11.

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Kontorovich, V. M., A. V. Kats und D. S. Krivitsky. „Activity as the Result of Merging“. In Multi-Wavelength Continuum Emission of AGN, 513. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_209.

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Schalinski, C. J., P. Biermann, A. Eckart, K. J. Johnston, T. Ph Krichbaum und A. Witzel. „Bulk Relativistic Motion in a Complete Sample of Radio Selected AGN“. In Observational Evidence of Activity in Galaxies, 287–93. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3851-9_41.

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Hjelm, M., P. O. Lindblad und S. Jörsäter. „Nuclear Activity in the Seyfert Galaxy NGC 1365“. In Multi-Wavelength Continuum Emission of AGN, 448. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_154.

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Storchi-Bergmann, Thaisa, Andrew S. Wilson und Jack A. Baldwin. „Star-Formation and Nuclear Activity in Three Galaxies with Nuclear Rings“. In Multi-Wavelength Continuum Emission of AGN, 460. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_166.

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Magdziarz, P., und J. Machalski. „Time Scale of Radio Sources Activity from the Statistical Model of Variability“. In Multi-Wavelength Continuum Emission of AGN, 398. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_112.

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Harrison, Christopher Mark. „Energetic Galaxy-Wide Outflows in High-z ULIRGs Hosting AGN Activity“. In Observational Constraints on the Influence of Active Galactic Nuclei on the Evolution of Galaxies, 47–81. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28454-5_3.

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Bîrzan, L., B. R. McNamara, C. L. Carilli, P. E. J. Nulsen und M. W. Wise. „Radio Properties of Cavities in the ICM: Imprints of AGN Activity“. In Eso Astrophysics Symposia, 115–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73484-0_22.

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Konferenzberichte zum Thema "AGN activity"

JOHNSON, O., P. BEST und O. ALMAINI. „AGN ACTIVITY IN HIGH REDSHIFT CLUSTERS AND PROTOCLUSTERS“. In Proceedings of the Guillermo Haro Conference 2003. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702432_0103.

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Magliocchetti, Manuela, Dieter Lutz, Paola Santini, Mara Salvato, Popesso Paola, Stefano Berta, Pozzi Francesca und David Rosario. „Is there any feedback between AGN and star-forming activity in radio-selected AGN?“ In The many facets of extragalactic radio surveys: towards new scientific challenges. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.267.0056.

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Teräsranta, Harri. „The burst activity of millimeter wavelengths compared to gamma-activity of AGN“. In The fourth compton symposium. AIP, 1997. http://dx.doi.org/10.1063/1.53958.

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Smolcic, Vernesa, Paolo Padovani, Jacinta Delhaize, Isabella Prandoni, Nicholas Seymour, Matt Jarvis, Jose Afonso et al. „Exploring AGN Activity over Cosmic Time with the SKA“. In Advancing Astrophysics with the Square Kilometre Array. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.215.0069.

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Šimon, V. „Activity of the dwarf nova CH UMa“. In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434781.

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Mancuso, Claudia, Matteo Bonato, Andrea Lapi, Gianfranco De Zotti und Luigi Danese. „Modeling star formation and AGN activity in sub-mJy radio surveys“. In The many facets of extragalactic radio surveys: towards new scientific challenges. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.267.0054.

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de Gouveia Dal Pino, Elisabete. „3D MHD Simulations of the Central Region of the Perseus Galaxy Cluster: the Role of Starburst and AGN Activity and Particle Acceleration by Magnetic Reconnection“. In AGN Physics in the CTA Era. Trieste, Italy: Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.141.0031.

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Šimon, V. „Color variations during activity states of the binary V Sge“. In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434780.

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Boller, Th. „Narrow-line Seyfert 1 galaxies as an extreme of Seyfert activity“. In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434616.

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Alonso-Herrero, Almudena. „AGN and star formation activity in local luminous and ultraluminous infrared galaxies (review)“. In Nuclei of Seyfert galaxies and QSOs - Central engine & conditions of star formation. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.169.0043.

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Berichte der Organisationen zum Thema "AGN activity"

Schwartzstein, Joshua, und Andrei Shleifer. An Activity-Generating Theory of Regulation. Cambridge, MA: National Bureau of Economic Research, Februar 2009. http://dx.doi.org/10.3386/w14752.

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Munroe, Donna. Crime as a routine activity : an investigation. Portland State University Library, Januar 2000. http://dx.doi.org/10.15760/etd.3271.

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Gertler, Mark. Financial Structure and Aggregate Economic Activity: An Overview. Cambridge, MA: National Bureau of Economic Research, April 1988. http://dx.doi.org/10.3386/w2559.

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Lee, Jason S., Richard I. Ray, Brenda J. Little, Daniel R. DeMarco und Michael H. Dorsey. An Evaluation of an Inline Sensor for Detection of Microbial Activity. Fort Belvoir, VA: Defense Technical Information Center, Januar 2005. http://dx.doi.org/10.21236/ada430220.

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Goldschlag, Nathan, Julia Lane, Bruce Weinberg und Nikolas Zolas. Proximity and Economic Activity: An Analysis of Vendor‐University Transactions. Cambridge, MA: National Bureau of Economic Research, Januar 2017. http://dx.doi.org/10.3386/w23018.

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Verch, Richard L. Nongame Breeding Bird Activity in an Intensively Cultured Populus Plantation. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1986. http://dx.doi.org/10.2737/nc-rn-336.

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Zakharova L.M., Zakharova V.S. Physical Activity Influence on Cognitive Development of Late Pre-School Age Children. Povolzhskaya State Academy of Physical Culture of Sports and Tourism, September 2017. http://dx.doi.org/10.14526/03_2017_244.

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Evenson, Kelly R., Ty A. Ridenour, Jacqueline Bagwell und Robert D. Furberg. Sustaining Physical Activity Following Cardiac Rehabilitation Discharge. RTI Press, Februar 2021. http://dx.doi.org/10.3768/rtipress.2021.rr.0043.2102.

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Annotation:

Because many patients reduce exercise following outpatient cardiac rehabilitation (CR), we developed an intervention to assist with the transition and evaluated its feasibility and preliminary efficacy using a one-group pretest–posttest design. Five CR patients were enrolled ~1 month prior to CR discharge and provided an activity tracker. Each week during CR they received a summary of their physical activity and steps. Following CR discharge, participants received an individualized report that included their physical activity and step history, information on specific features of the activity tracker, and encouraging messages from former CR patients for each of the next 6 weeks. Mixed model trajectory analyses were used to test the intervention effect separately for active minutes and steps modeling three study phases: pre-intervention (day activity tracking began to CR discharge), intervention (day following CR discharge to day when final report sent), and maintenance (day following the final report to ~1 month later). Activity tracking was successfully deployed and, with weekly reports following CR, may offset the usual decline in physical activity. When weekly reports ceased, a decline in steps/day occurred. A scaled-up intervention with a more rigorous study design with sufficient sample size can evaluate this approach further.

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Lee, Che-Hung, Robert Brown, Elizabeth A. Jajane und Hsiu-Ying T. Yang. Monoclonal Antibody to an Endogenous Neuropeptide with Putative Morphine-Modulating Activity. Fort Belvoir, VA: Defense Technical Information Center, Dezember 1988. http://dx.doi.org/10.21236/ada205386.

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Bergmann, D. W., F. J. Mollerus und J. L. Wray. An assessment of KW Basin radionuclide activity when opening SNF canisters. Office of Scientific and Technical Information (OSTI), Februar 1995. http://dx.doi.org/10.2172/10119293.

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