Relevant bibliographies by topics / Circinus

Academic literature on the topic 'Circinus'

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Published: 10 March 2023

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Journal articles on the topic "Circinus"

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Do Duy, Tho, and Warrick A. Lawson. "Evidence for the absorption of crystalline silicates at 11.1 $\mu$m in the spectra of the nucleus of the Circinus galaxy." Monthly Notices of the Royal Astronomical Society: Letters 488, no. 1 (June 18, 2019): L75—L79. http://dx.doi.org/10.1093/mnrasl/slz096.

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Abstract Several mid-infrared spectra of the Circinus galaxy nucleus taken with T-ReCS on Gemini South and MIDI on VLTI have consistently shown an inflection centred around 11 $\mu$m. We ascribe this feature to the absorption of crystalline silicate, based on their similarity in profile shape and improvement in fitting quality using a partially crystalline silicate model, compared to entirely amorphous models. Spectral fits reveal a fraction of 0.6–2.0 per cent of crystalline forsterite in the nucleus of the Circinus galaxy, which is similar to the values obtained for the interstellar medium (ISM) of the Milky Way. This is probably the first detection of crystalline silicate absorption in the nucleus of this Seyfert 2 galaxy. In addition, the presence of large grain-size amorphous silicates, together with the similarity in profile shape of the optical depth of Circinus with those of young stellar objects in the Milky Way, implies that most of the contribution to the spectra of Circinus comes from dust in the star formation regions near the centre of the nucleus or along the line of sight to the Earth, rather than in the ISM of Circinus. We also compare our optical depths of Circinus with those in previous studies.
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Veilleux, Sylvain, and Jonathan Bland-Hawthorn. "Artillery Shells over Circinus." Astrophysical Journal 479, no. 2 (April 20, 1997): L105—L108. http://dx.doi.org/10.1086/310588.

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Lutz, D., R. Genzel, E. Sturm, A. F. M. Moorwood, E. Oliva, A. Marconi, and H. Netzer. "AGN Spectra as Seen by the Infrared Space Observatory: First Results." International Astronomical Union Colloquium 159 (1997): 333–36. http://dx.doi.org/10.1017/s0252921100040379.

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AbstractWe discuss 2.5–45 µm spectra of the Circinus galaxy and of Cen A, obtained with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory. The large number of detected ionic fine structure lines, observable also in visually obscured sources, provides strong constraints on the shape of the ionizing spectrum, which is found to exhibit a UV bump peaking at ~ 70 eV in the case of Circinus. Pure rotational emission of molecular hydrogen, directly probing warm molecular gas, can for the first time be detected in external galaxies.
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Mondal, Samaresh, Agata Różańska, Patrycja Bagińska, Alex Markowitz, and Barbara De Marco. "Spectral state transitions in Circinus ULX5." Astronomy & Astrophysics 651 (July 2021): A54. http://dx.doi.org/10.1051/0004-6361/202140459.

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Context. We performed timing and spectral analyses of multi-epoch Suzaku, XMM-Newton, and NuSTAR observations of the ultraluminous X-ray source (ULX) Circinus ULX5 with the aim of putting constraints on the mass of the central object and the accretion mode operating in this source. Aims. We investigate whether the source contains a stellar mass black hole (BH) with a super-Eddington accretion flow or an intermediate mass black hole accreting matter in a sub-Eddington mode. Moreover, we search for major observed changes in spectra and timing and determine whether they are associated with major structural changes in the disk, similarly to those in black hole X-ray binaries. Methods. We collected all available broadband data from 2001 to 2018 including Suzaku, XMM-Newton, and NuSTAR. We a performed timing and spectral analyses to study the relation between luminosity and inner disk temperature. We proceeded with time-averaged spectral analysis using phenomenological models of different accretion modes. Finally, we constructed the hardness ratio versus intensity diagram to reveal spectral state transitions in Circinus ULX5. Results. Our spectral analysis revealed at least three distinctive spectral states of Circinus ULX5 that are analagous to state transitions in Galactic black hole X-ray binaries. Disk-dominated spectra are found in high flux states and the power-law dominated spectra are found in lower flux states. The source was also observed in an intermediate state, where the flux was low, but the spectrum is dominated by a disk component. Over eighteen years of collected data, ULX5 appeared two times in the high, three times in the low, and two times in the intermediate state. The fastest observed transition was ∼seven months. Conclusions. Our analysis suggests that the central object in Circinus ULX5 is a stellar mass BH (< 10 M⊙) or, possibly, a neutron star (NS) despite there being no detection of pulsations in the light curves. The fractional variability amplitudes are consistent with state transitions in Circinus ULX5, wherein higher variability from the power law-like Comptonized emission becomes suppressed in the thermal disk-dominated state.
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Yang, Y., A. S. Wilson, G. Matt, Y. Terashima, and L. J. Greenhill. "SUZAKUOBSERVATIONS OF THE CIRCINUS GALAXY." Astrophysical Journal 691, no. 1 (January 7, 2009): 131–39. http://dx.doi.org/10.1088/0004-637x/691/1/131.

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Smith, David A., and Andrew S. Wilson. "AChandraObservation of the Circinus Galaxy." Astrophysical Journal 557, no. 1 (August 10, 2001): 180–92. http://dx.doi.org/10.1086/321667.

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Noroozi, S., M. Haas, Z. Chen, and R. Chini. "Hα emission objects in Circinus." Astronomische Nachrichten 334, no. 3 (March 2013): 282–87. http://dx.doi.org/10.1002/asna.201211843.

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Rector, T. A., L. Prato, and A. L. Strom. "Herbig–Haro Outflows in Circinus W." Astronomical Journal 160, no. 4 (September 29, 2020): 189. http://dx.doi.org/10.3847/1538-3881/abb3d3.

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Haynes, RF. "Cir X-1 Revisited: 843 MHz Observations of Cir X-1 and G321·9?0·3." Australian Journal of Physics 40, no. 6 (1987): 741. http://dx.doi.org/10.1071/ph870741.

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New high-sensitivity results at 843 MHz are presented for the Circinus X-I (Cir X-I) and SNR G 3 21 �9 - 0 . 3 regions. We summarise current observational data for Cir X-I and discuss appropriate models.
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Mikami, T., and K. Ogura. "H emission stars in the Circinus region." Monthly Notices of the Royal Astronomical Society 270, no. 1 (September 1, 1994): 199–204. http://dx.doi.org/10.1093/mnras/270.1.199.

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Dissertations / Theses on the topic "Circinus"

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Shirley, Robert Edward 1972. "Mass transfer and accretion in the eccentric neutron-star binary Circinus X-1." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47699.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
Includes bibliographical references (p. 199-206).
I have carried out a project to study the eccentric neutron-star binary Circinus X-1 through an extensive series of observational studies with the Rossi X-ray Timing Explorer satellite and through theoretical computer models I developed to explore mass transfer and evolution in an eccentric binary. We also organized two multi-frequency campaigns to study correlated variability in different frequency bands. The X-ray observations showed that the intensity of Cir X- 1 currently maintains a bright baseline level, with strong flares occurring after phase zero of each 16.55-day cycle of the source. This behavior is thought to be due to enhanced mass transfer occurring near periastron of a highly eccentric binary orbit. Dips below the baseline intensity level also occur near phase zero. I modeled the evolution of the energy spectrum during dips with a variably absorbed bright component plus a fainter unabsorbed component. I show that variability not attributable to absorption dips is related to the spectral/intensity states of the "Z source" class of low-mass X-ray binaries (LMXBs), namely motion along (or shifts of) the horizontal, normal, and flaring branches of the "Z" track in color-color and hardness-intensity diagrams. I found rapid X-ray variability properties associated with each spectral/intensity state: On the horizontal branch, quasi-periodic oscillations (QPOs) in the X-ray intensity shift in frequency from 1.3 to 35 Hz. On the normal branch, a different QPO occurs at about 4 Hz. On the flaring branch only strong aperiodic variability occurs. I modeled the evolution of the energy spectra associated with each of these branches. To study mass transfer in an eccentric binary, I developed computer codes for transfer via Rochelobe overflow and from a stellar wind. I derive theoretical mass accretion profiles and compare them to the observed profile of the X-ray intensity. In order to explore the possible evolutionary history of Circinus X-1, I developed a binaryevolution computer code for a neutron-star and low-mass companion in an eccentric orbit. I use this code in a population-synthesis study to show that the number of systems in the Galaxy expected to resemble Cir X-1 is of order unity, consistent with its unique status as an LMXB with high eccentricity.
by Robert E. Shirley.
Ph.D.
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Moin, Aquib. "Rapid response monitoring of transient radio emission associated with gamma-ray bursts and circinus X-1." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/1113.

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This PhD project was aimed at carrying out comprehensive observational studies of radio sources associated with two types of transients: a) Gamma- Ray Bursts (GRBs) b) an X-ray binary system Circinus X-1, by exploring and utilising new technologies and the enhanced capabilities of radio astronomy facilities in Australia. The emergence of the electronic-Very Long Baseline Interferometry (e-VLBI) capability of the Australian Long Baseline Array (LBA) and the new broadband backend for the Australia Telescope Compact Array (ATCA) has opened up new observational possibilities. These new upgrades enabled the rapid-response, high sensitivity and high resolution observations of transient radio sources.As part of this project, the radio behaviour of the peculiar X-ray binary system, Circinus X-1, was studied by executing an unprecedented e-VLBI observation campaign aimed at tracking the system along its entire binary orbit. Following the e-VLBI campaign, Target-of-Opportunity VLBI observations of Circinus X-1 allowed for the first time the detection of milliarcsecond-scale jets associated with it. The second part of this project involved a coordinated and systematic GRB detection and monitoring program, leading to the detection of the radio afterglow of an unusual gamma-ray burst, GRB 100418a which was studied in detail in an attempt to understand the underlying physical processes associated with GRBs. This program also allowed us to build-up some observational statistics and maintain a record of southern GRBs.
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McCallum, Jamie Nigel. "Scintillation in Circinus." Thesis, 2009. https://eprints.utas.edu.au/20710/1/whole_McCallumJamieNigel2009_thesis.pdf.

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This work is an investigation of the Circinus H20 megamasers, especially the unusual rapid variability seen in their flux density. It has been previously hypothesized that this was due to interstellar scintillation and one of the aims of this study was to test this. If scintillation proved to be the cause, then there was the potential application of Earth-Orbit synthesis to study the pas structure of the masers themselves. This was carried out by a monitoring campaign using the Tidbinbilla 70m telescope, joint VLBI imaging / time-delay detection experiments with the LBA (Long Baseline Array) and fullpolarization observations using the ATCA (Australia Telescope Compact Array). The results have shown good but not definitive evidence for the scintillation hypothesis, and specifically for quenched diffractive scintillation. The strongest single piece of evidence is in the detection of an apparent annual cycle at the 3σ significance level. The fitted annual cycle is consistent with the non-detections of a time delay between the Tidbinbilla and ATCA telescopes in the simultaneous observations made in 2004. The quenched diffractive scintillation model successfully accounts for the observed properties of the variability by proposing a certain range of size and morphologies within the population of the Circinus megamasers. While consistent with the observations, the models have proved difficult to usefully test due to the extremely high levels of intrinsic variability that the monitoring campaign has revealed. It is hoped that future work will enable a more rigorous testing of the proposed models.
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Venturi, Giacomo. "The impact of galactic outflows on their host galaxies through spatially resolved spectroscopy." Doctoral thesis, 2019. http://hdl.handle.net/2158/1160629.

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The observed properties of galaxies and supermassive black holes (BH) at their centers suggest that there must be a non-gravitational feedback mechanism regulating their evolution. These are the discrepancy at low and high masses between the observed stellar mass function of galaxies and that predicted by ΛCDM models, the scaling relations between the mass of BHs and the velocity dispersion, mass and luminosity of the host galaxy spheroid and the similarity between BH growth and star formation cosmic histories. Models of galaxy formation and evolution in fact routinely include feedback from active galactic nuclei (AGN) and supernovae (SNe), which can successfully reproduce the observed properties cited above. Models consider the following two types of AGN feedback: the radiative mode (or quasar mode), that operates during a luminous AGN phase through winds powered by radiation pressure, and the kinetic (or radio) mode, in which kinetic energy is released by the AGN on longer timescales through relativistic jets, which heat the surrounding halo in galaxy clusters, thus preventing cooling and further accretion on the central galaxy, and consequently further star formation. So far, the clearest observational evidence of AGN feedback comes from the kinetic mode in massive central cluster galaxies. Radiative feedback is instead more elusive, and has been recently revealed in action only in a few luminous quasars around the peak of AGN activity history (z~2), where most powerful outflows are observed. However, it is not possible to study high-z quasar outflows on small spatial scales (<100 pc), being poorly-resolved or even unresolved in observations, due to their large distances. This can lead to systematics and uncertainties in the determination of outflow properties and forces to make some assumptions on them, which further increases the uncertainties on the outflow energetics and complicates the evaluation of the impact of outflows on host galaxies and the comparison with models. On the contrary, due to their vicinity, nearby active galaxies are ideal laboratories to explore in detail outflow properties, their formation and acceleration mechanisms, as well as the effects of AGN activity on host galaxies. This work focuses on investigating the properties of outflows in nearby Seyfert galaxies, the physical conditions of the ionized gas and the interplay between nuclear activity and star formation in the galaxy, thanks to the unprecedented combination of spatial and spectral coverage provided by the integral field spectrograph MUSE at the Very Large Telescope (VLT). We introduce our optically- and X-ray selected sample of nearby Seyferts, called MAGNUM survey. We present our MUSE emission-line flux and kinematic maps of the 10 objects we have analyzed so far, including a star-forming galaxy, NGC 6810, to study the properties of a starburst outflow for comparison as well. We map the ionized gas down to spatial scales as low as ~10 pc. We find ubiquitous ionization cones and outflows with various morphologies and extensions, from a few hundred pc to several kpc. We detect peculiar kinematic features suggestive of outflows with hollow-conical structures. We also identify enhanced linewidths perpendicular to radio jets, which point to a correlation between the presence of jets and perpendicular turbulent or outflowing gas motions. We then focus on a detailed multi-wavelength study of the ionized gas and outflow, in terms of physical properties, kinematics, and ionization mechanisms, in one specific galaxy of our sample, NGC 1365, from MUSE in optical band and Chandra satellite in X-rays. Here we map a kpc-scale biconical outflow ionized by the AGN prominent in [O III], while Hα emission traces star formation in a circumnuclear ring and along the bar of the galaxy. Soft X-rays are mostly due to thermal emission from the star-forming regions, but we manage to isolate the AGN photoionized component which matches the [O III] emission from MUSE. We map the mass outflow rate of the galactic ionized outflow, which matches that of the nuclear X-ray wind and then decreases with radius. The integrated mass outflow rate, kinetic energy rate, and outflow velocity are broadly consistent with the typical relations observed in more luminous AGN. We extend our analysis to the nearby star-forming galaxy NGC 6810, whose bipolar galactic ionized outflow we map with MUSE. We determine the dominant ionization mechanism in the outflow, its density and ionization parameter, discovering the first case of star formation occurring within an outflow in an unambiguously star-forming galaxy. We finally investigate with MUSE also the kinetic AGN feedback, by studying the ionized gas enshrouding the X-ray cavity inflated by radio jets around the massive radio-galaxy 3C 317 at the center of the local cluster Abell 2052. Thanks to MUSE capabilities, by mapping the warm gas filaments enshrouding the bubble we are able to directly measure the expansion velocity of the cavity, which usually is instead assumed or derived from indirect and model-dependent methods.
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Tichich, Ryan P. "Evaluation of pseudomonas syringae pv. tagetis as a biosuppression agent for Canada thistle (circium arvense l.)." 2003. http://catalog.hathitrust.org/api/volumes/oclc/52125832.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2003.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 78-81).
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Books on the topic "Circinus"

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United States. National Aeronautics and Space Administration., ed. Final report for two XTE A01 projects: A multifrequency study of Circinus X-1 and A search for microsecond variability from bright galactic X-ray source. [Washington, DC: National Aeronautics and Space Administration, 1998.

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Scott, A. M. Lightwave: Circini Search. Independently Published, 2019.

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NCCER. 33204-10 Semiconductors and Integrated Circits TG. Pearson Education, Limited, 2011.

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Ltd, ICON Group. PENTEX SCHWEIZER CIRCIUTS LTD: International Competitive Benchmarks and Financial Gap Analysis (Financial Performance Series). 2nd ed. Icon Group International, Inc., 2000.

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Book chapters on the topic "Circinus"

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Oosterbroek, T., M. Van Der Klis, E. Kuulkers, and J. Van Paradijs. "Fast Timing Behaviour of Circinus X-1." In Astrophysics and Space Science Library, 619–20. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0794-5_89.

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Kramer, Carsten, Marc Hitschfeld, Manuel Aravena, Frank Bertoldi, Jürgen Stutzki, and Yasuo Fukui. "CO 4–3 and [CI] 1–0 in Circinus and NGC 4945." In Astrophysics and Space Science Proceedings, 291–92. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6933-8_70.

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Weiss, Werner W., Hartmut Schneider, Rainer Kuschnig, and Patrice Bouchet. "α Circini: Variability in the infrared and visible." In Progress of Seismology of the Sun and Stars, 393–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/3-540-53091-6_105.

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Arnold, HJP, P. Doherty, P. Moore, and Arnold Wolfendale. "Centaurus, Circinus, Lupus, Norma." In The Photographic Atlas of the Stars, 172–77. Routledge, 2020. http://dx.doi.org/10.1201/9780203736258-39.

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"Colletotrichum circinans." In Encyclopedia of Genetics, Genomics, Proteomics and Informatics, 391. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6754-9_3345.

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"Pemphigus circinatus." In Dermatology Therapy, 447. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/3-540-29668-9_2070.

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"On the violence of the wind Circius." In OLAUS MAGNUS Historia de Gentibus Septentrionalibus Romæ 1555, edited by Peter Foote and †John Granlund, 32–33. Routledge, 2018. http://dx.doi.org/10.4324/9781315598758-12.

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Conference papers on the topic "Circinus"

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Fender, R. P. "New radio observations of Circinus X-1." In The fourth compton symposium. AIP, 1997. http://dx.doi.org/10.1063/1.53979.

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BOUTLOUKOS, S., M. VAN DER KLIS, D. ALTAMIRANO, M. KLEIN-WOLT, and R. WIJNANDS. "kHz QPO PAIRS EXPOSE THE NEUTRON STAR OF CIRCINUS X-1." In Proceedings of the MG11 Meeting on General Relativity. World Scientific Publishing Company, 2008. http://dx.doi.org/10.1142/9789812834300_0105.

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Ebrahim, Rozeena, Andrew Chen, Dmitry Prokhorov, Kshitij Thorat, Gyula I.G. Jozsa, and Paolo Serra. "Multi-wavelength study of large-scale outflows from the Circinus galaxy." In 7th Annual Conference on High Energy Astrophysics in Southern Africa. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.371.0018.

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Tudose, Valeriu M. "Long-term Radio Behaviour of the X-ray Binary Circinus X-1." In Bursts, Pulses and Flickering: wide-field monitoring of the dynamic radio sky. Trieste, Italy: Sissa Medialab, 2008. http://dx.doi.org/10.22323/1.056.0014.

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Roy, A. L. "Radio Recombination Lines from Starbursts: NGC 3256, NGC 4945 and the Circinus Galaxy." In THE EVOLUTION OF STARBURSTS: The 331st Wilhelm and Else Heraeus Seminar. AIP, 2005. http://dx.doi.org/10.1063/1.2034998.

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Bauer, F. E., S. Smartt, S. Immler, W. N. Brandt, K. W. Weiler, Stefan Immler, and Kurt Weiler. "SN 1996cr: Confirmation of a Luminous Type IIn Supernova in the Circinus Galaxy." In SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. AIP, 2007. http://dx.doi.org/10.1063/1.2803602.

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Bauer, F. E., S. Smartt, S. Immler, W. N. Brandt, K. W. Weiler, Stefan Immler, and Kurt Weiler. "SN 1996cr: Confirmation of a Luminous Type IIn Supernova in the Circinus Galaxy." In SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. AIP, 2007. http://dx.doi.org/10.1063/1.3682939.

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Schulz, Norbert S., Reba M. Bandyopadhyay, Stefanie Wachter, Dawn Gelino, and Christopher R. Gelino. "Jets, Winds & Warm Absorbers: Is Circinus X-l unique among Galactic X-Ray Binaries?" In A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP, 2008. http://dx.doi.org/10.1063/1.2945100.

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Schüssler, Fabian, Pol Bordas, Paula Chadwick, Hugh Dickinson, and Jean-Pierre ERNENWEIN. "Simultaneous H.E.S.S. and RXTE observations of the microquasars GRS 1915+105, Circinus X-1 and V4641 Sgr." In The 34th International Cosmic Ray Conference. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.236.0727.

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Boutloukos, Stratos, Frederick K. Lamb, C. Bassa, Z. Wang, A. Cumming, and V. M. Kaspi. "Implications of kHz QPOs for the Spin Frequencies and Magnetic Fields of Neutron Stars: New Results from Circinus X-1." In 40 YEARS OF PULSARS: Millisecond Pulsars, Magnetars and More. AIP, 2008. http://dx.doi.org/10.1063/1.2900291.

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Reports on the topic "Circinus"

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Saz Parkinson, Pablo. Long term X-ray variability of Circinus X-1. Office of Scientific and Technical Information (OSTI), March 2003. http://dx.doi.org/10.2172/812964.

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Saz Parkinson, Pablo M. Timing and Spectral Studies of the Peculiar X-ray Binary Circinus X-1. Office of Scientific and Technical Information (OSTI), August 2003. http://dx.doi.org/10.2172/815635.

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