Relevant bibliographies by topics / Quasars : absorption

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Quasars : absorption'

Author: Grafiati
Published: 30 November 2024

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Journal articles on the topic "Quasars : absorption"

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Mishra, Sapna, M. Vivek, Hum Chand, and Ravi Joshi. "Appearance versus disappearance of broad absorption line troughs in quasars." Monthly Notices of the Royal Astronomical Society 504, no. 3 (2021): 3187–202. http://dx.doi.org/10.1093/mnras/stab782.

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ABSTRACT We present a new set of 84 broad absorption line (BAL) quasars (1.7 < zem < 4.4) exhibiting an appearance of C iv BAL troughs over 0.3–4.8 rest-frame years by comparing the Sloan Digital Sky Survey Data Release (SDSSDR)-7, SDSSDR-12, and SDSSDR-14 quasar catalogues. We contrast the nature of BAL variability in this appearing BAL quasar sample with a disappearing BAL quasar sample studied in the literature by comparing the quasar’s intrinsic, BAL trough, and continuum parameters between the two samples. We find that appearing BAL quasars have relatively higher redshift an
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Chen, Zhi-Fu, Huan-Chang Qin, Jin-Ting Cai, et al. "The Study of the Circumgalactic Medium with Quasar Pairs." Astrophysical Journal Supplement Series 265, no. 2 (2023): 46. http://dx.doi.org/10.3847/1538-4365/acbe01.

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Abstract We have collected 10,025 foreground–background quasar pairs with projected distances d p < 500 kpc from the large quasar catalog of the Sloan Digital Sky Survey DR16Q. We investigate the properties of the Mg ii absorption lines with W r > 0.15 Å around foreground quasars, including both the line of sight (LOS; of foreground quasars) and transverse (TRA; perpendicular to the LOS) absorptions. Both the equivalent width (the correlation coefficient ρ = −0.915 and the probability P < 10−4 of no correlation) and incident rate (ρ = −0.964 and P < 10−6) of TRA Mg ii absorption li
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Harutyunian, Haik A. "Are There Quasars at Non-Cosmological Distances?" Symposium - International Astronomical Union 194 (1999): 428–31. http://dx.doi.org/10.1017/s0074180900162485.

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In Dravskikh & Dravskikh (1996) the results of a statistical analysis of quasar luminosity as a function of redshift, if it is assumed to be cosmological, are given (see Fig.1). Three quasar samples were analyzed separately: •quasars with absorption lines;•quasars associated with galaxies or association-quasars not having absorption lines (from Burbidge et al. 1996);•other quasars not included in the first two groups.
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Wang, Xilin. "Direct observation evidence for the origin of broad emission lines in quasars: Understanding emission via absorption." Theoretical and Natural Science 26, no. 1 (2023): 261–72. http://dx.doi.org/10.54254/2753-8818/26/20241105.

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This year marks the 60^th anniversary of quasar discovery in 1963. The kinematics of gaseous clouds in quasars have been the subject of decades-long debate, focusing on two modelsrotation and blowing-wind. The rotation model, wherein gaseous clouds orbit black holes, is widely accepted by astronomers and frequently used to measure supermassive black hole (SMBH) masses in quasars. Another model is blowing-wind model, in which the gaseous clouds are outflows and in linear motion toward all directions. Our study creatively employs the quasar absorption line technique, utilizing atomic hydrogen Ba
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Peng, Xing-Long, Zhi-Fu Chen, Zhi-Cheng He, Ting-Ting Pang, and Zhi-Wen Wang. "Comprehensive Connection among the Quasars with Different Types of Outflow Absorption Lines." Astrophysical Journal 963, no. 1 (2024): 3. http://dx.doi.org/10.3847/1538-4357/ad1e5e.

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Abstract It is commonly accepted that outflows from the central regions of quasars play a substantial role in regulating the global properties of the host galaxy. These outflows are typically detected through blueshifted absorption lines. However, the question remains whether outflows observed with different absorption line types indeed reflect the same environmental or evolutionary stage of the host galaxy. In this study, we use the Sloan Digital Sky Survey quasar catalog and employ the flux ratio of [O II] and [Ne V] emission lines as indicators to compare star formation rates (SFRs) within
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Misawa, Toru, Rikako Ishimoto, Satoshi Kobu, et al. "Exploratory Study of the Transverse Proximity Effect around BAL Quasars." Astrophysical Journal 933, no. 2 (2022): 239. http://dx.doi.org/10.3847/1538-4357/ac7715.

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Abstract We aim to determine why there exists anisotropic H i absorption around quasars; i.e., the environments around quasars are highly biased toward producing strong H i absorption in the transverse direction while there exists a significant deficit of H i absorption within a few megaparsecs of quasars along the line of sight. The most plausible explanation for this opposite trend is that the transverse direction is shielded from quasar UV radiation by dust torus. However, a critical weakness of this explanation is that we do not have any information on the inclination angle of our sightlin
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Hennawi, Joe. "The Circumgalactic Medium of Quasars." Proceedings of the International Astronomical Union 9, S304 (2013): 355. http://dx.doi.org/10.1017/s174392131400430x.

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AbstractI will argue that observations of the diffuse gas in the outskirts of quasar host galaxies, or the so called circumgalactic medium, are essential for understanding how luminous quasars evolve in a cosmological context. Such observations also provide a fruitful comparison to theory, because hydrodynamics at moderate overdensities is much easier to simulate than the complicated processes which trigger quasar activity. A novel technique will be introduced, whereby a foreground quasar can be studied in absorption against a background quasar, resolving scales as small as 30 kpc. This experi
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Aldcroft, T., J. Bechtold, P. Smith, C. Foltz, and G. Schmidt. "Optical Polarization and Line Variability in Quasars with Associated Absorption." International Astronomical Union Colloquium 163 (1997): 681–82. http://dx.doi.org/10.1017/s0252921100043396.

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AbstractThe physical origin of associated absorption lines (zabs ≈ zqso) which are observed in radio-loud quasar is generally not well understood. Two observable properties, line variability and quasar optical polarization, can serve to constrain the possibilities. To this end, we have obtained high-resolution spectra (1 Å) and broad-band optical polarizations for over 30 radio-loud quasars with known CIV associated absorption. The quasars are at redshifts between about 1 and 2, and were previously observed spectroscopically at similar resolution between 1985 – 1986 by Foltz et al (1987). The
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Ennesser, Lauren, Paul Martini, Andreu Font-Ribera та Ignasi Pérez-Ràfols. "The impact and mitigation of broad-absorption-line quasars in Lyman α forest correlations". Monthly Notices of the Royal Astronomical Society 511, № 3 (2022): 3514–23. http://dx.doi.org/10.1093/mnras/stac301.

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ABSTRACT Correlations in and with the flux transmission of the Lyman α (Ly α) forest in the spectra of high-redshift quasars are powerful cosmological tools, yet these measurements can be compromised if the intrinsic quasar continuum is significantly uncertain. One particularly problematic case is broad-absorption-line (BAL) quasars, which exhibit blueshifted absorption associated with many spectral features that are consistent with outflows of up to ∼0.1c. As these absorption features can both fall in the forest region and be difficult to distinguish from Ly α absorption, cosmological analyse
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Miller, Timothy R., Nahum Arav, Xinfeng Xu, and Gerard A. Kriss. "The contribution of quasar absorption outflows to AGN feedback." Monthly Notices of the Royal Astronomical Society 499, no. 1 (2020): 1522–29. http://dx.doi.org/10.1093/mnras/staa2981.

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ABSTRACT Determining the distance of quasar absorption outflows from the central source (R) and their kinetic luminosity ($\dot{E}_\mathrm{\scriptstyle k}$) is crucial for understanding their contribution to active galactic nucleus (AGN) feedback. Here, we summarize the results for a sample of nine luminous quasars that were observed with the Hubble Space Telescope. We find that the outflows in more than half of the objects are powerful enough to be the main agents for AGN feedback, and that most outflows are found at R > 100 pc. The sample is representative of the quasar absorption out
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Dissertations / Theses on the topic "Quasars : absorption"

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Storrie-Lombardi, Lisa Jo. "Absorption in the highest redshift quasars." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339500.

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Krogager, J. K., J. P. U. Fynbo, K. E. Heintz, et al. "THE EXTENDED HIGH A(V) QUASAR SURVEY: SEARCHING FOR DUSTY ABSORBERS TOWARD MID-INFRARED-SELECTED QUASARS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/624064.

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We present the results of a new spectroscopic survey for dusty intervening absorption systems, particularly damped Ly alpha absorbers (DLAs), toward reddened quasars. The candidate quasars are selected from mid-infrared photometry from the Wide-field Infrared Survey Explorer combined with optical and near-infrared photometry. Out of 1073 candidates, we secure low-resolution spectra for 108 using the Nordic Optical Telescope on La Palma, Spain. Based on the spectra, we are able to classify 100 of the 108 targets as quasars. A large fraction (50%) is observed to have broad absorption lines (BALs
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Xu, Xinfeng. "How Do Quasars Impact Their Host Galaxies? From the Studies of Quasar Outflows in Absorption and Emission." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/98572.

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``Quasar-mode feedback'' occurs when momentum and energy from the environment of accreting supermassive black hole couple to the host galaxy. One mechanism for such a coupling is by high-velocity (up to $sim$ 0.2c) quasar-driven ionized outflows, appearing as blue-shifted absorption and emission lines in quasar spectra. Given enough energy and momentum, these outflows are capable of affecting the evolution of their host galaxies. This dissertation presents the studies of emission and absorption quasar outflows from different perspectives. (1). By conducting large broad absorption line (BAL)
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Morrison, Sean Stephen. "Using quasar absorption to study inhomogeneities in the UV background." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0501.

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L'étude du fond UV (UVB) est importante pour comprendre l'évolution de l'Univers. Le UVB évolue et est inhomogène. Cette thèse se concentre sur l'étude des inhomogénéités à grande échelle dans le UVB extragalactique, et les modifications des métaux du fait de proximité des quasars. Nous commençons par explorer les échelles dominante de ces inhomogénéités dans le UVB en combinant l'absorption intergalactique par l'hydrogène, l'hélium (HeII) et l'oxygène dans les lignes de visée du 2 quasars. Elle a révélé des inhomogénéités sur des échelles de ~10cMpc et \gtrsim 200cMpc à \bar{z}\approx 2.6. Ce
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Maureira, Pinochet María José. "The structure of MgII absorption systems from spectra of gravitationally lensed quasars." Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/111198.

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Magíster en Ciencias, Mención Astronomía<br>In this thesis I present a search for MgII absorption systems in the resolved spectra of 10 high redshifts gravitationally lensed quasars. The goal of the thesis is to study the spatial structure of MgII systems. The quasars were observed at resolutions $R\sim4\,500$ and $R\sim40\,000$. The search yielded a sample of 31 MgII absorption systems at $0.4<z<1.6$ and probing transverse separations between lines of sight (LOS) in the range 0.29-23 $h^{-1}_{70}$ kpc. Adding systems from the literature increased the number of systems to 95. The range of tran
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Brienza, Marisa. "Multy-frequency continuum radio observations of broad absorption line quasars." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5672/.

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Bruni, Gabriele <1981&gt. "Origin and Nature of Radio-Loud Broad Absorption Line Quasars." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4402/1/bruni_gabriele_tesi.pdf.

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The origin of Broad Absorption Line Quasars (BAL QSOs) is still an open issue. Accounting for ~20% of the QSO population, these objects present broad absorption lines in their optical spectra generated from outflows with velocities up to 0.2 c. Nowadays, the hypotheses about their nature are principally related to orientation or evolutionary scenarios. In the first one, absorption lines are produced by outflows originated by the accretion disk, basically present in all QSOs, but seen only when they intercept the line of sight. In the second hypothesis, BAL QSOs would be young or recently r
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Bruni, Gabriele <1981&gt. "Origin and Nature of Radio-Loud Broad Absorption Line Quasars." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4402/.

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The origin of Broad Absorption Line Quasars (BAL QSOs) is still an open issue. Accounting for ~20% of the QSO population, these objects present broad absorption lines in their optical spectra generated from outflows with velocities up to 0.2 c. Nowadays, the hypotheses about their nature are principally related to orientation or evolutionary scenarios. In the first one, absorption lines are produced by outflows originated by the accretion disk, basically present in all QSOs, but seen only when they intercept the line of sight. In the second hypothesis, BAL QSOs would be young or recently r
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BECHTOLD, JILL ELEANOR. "HIGH RESOLUTION SPECTROSCOPY OF QUASAR ABSORPTION LINES (INTERGALACTIC MEDIUM, EXTRAGALACTIC, GALAXIES)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188085.

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This dissertation investigates the properties of the metal-containing absorption lines seen in quasar spectra which have Z(abs) < < Z(em). These systems, which probably originate in the halos of galaxies at high redshift, are then compared to observations of the halo and interstellar medium of the Milky Way. We obtained echelle spectra at the Multiple Mirror Telescope (MMT) of the Z = 1.79 absorption system of the quasar B2 1225+317. The velocity profiles showed complex structure which varied from ion to ion, with ionization and column densities varying from component to component. The relati
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Murphy, Michael T. Physics Faculty of Science UNSW. "Probing variations in the fundamental constants with quasar absorption lines." Awarded by:University of New South Wales. School of Physics, 2002. http://handle.unsw.edu.au/1959.4/19062.

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Precision cosmology challenges many aspects of fundamental physics. In particular, quasar absorption lines test the assumed constancy of fundamental constants over cosmological time-scales and distances. Until recently, the most reliable technique was the alkali doublet (AD) method where the measured doublet separation probes variations in the fine-structure constant, ???? e2/??c. However, the recently introduced many-multiplet (MM) method provides several advantages, including a demonstrated ???10-fold precision gain. This thesis presents detailed MM analyses of 3 independent Keck/HIRES sampl
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Books on the topic "Quasars : absorption"

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United States. National Aeronautics and Space Administration., ed. High-resolution spectroscopy of quasars and quasar absorption-line systems. National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. High-resolution spectroscopy of quasars and quasar absorption-line systems. National Aeronautics and Space Administration, 1995.

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Lin, Zuo, and United States. National Aeronautics and Space Administration., eds. The dust-to-gas ratio in the damped LyÜ clouds toward the gravitationally lensed QSO 0957+561. National Aeronautics and Space Administration, 1997.

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Lin, Zuo, and United States. National Aeronautics and Space Administration., eds. The dust-to-gas ratio in the damped LyÜ clouds toward the gravitationally lensed QSO 0957+561. National Aeronautics and Space Administration, 1997.

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Columbia Astrophysics Laboratory (Columbia University) and United States. National Aeronautics and Space Administration., eds. Strong associated C IV absorption in low redshift quasars. National Aeronautics and Space Administration, Astrophysics Data Program, 1989.

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Ćirković, Milan M. QSO absorption spectroscopy and baryonic dark matter. Astronomical Observatory, 2005.

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M, Viegas Sueli, Gruenwald Ruth, and Carvalho Reinaldo R. de, eds. Young galaxies and QSO absorption-line systems: Proceedings of a workshop held in Santos, Brazil, 8-12 April 1996. Astronomical Society of the Pacific, 1997.

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Colloquium, International Astronomical Union. Probing galaxies through quasar absorption lines: Proceedings of the 199th colloquium of the International Astronomical Union held in Shanghai, People's Republic of China, March 14-18, 2005. Cambridge University Press, 2005.

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G, Meylan, and European Southern Observatory, eds. QSO absorption lines: Proceedings of the ESO workshop held at Garching, Germany, 21-24 November 1994. Springer, 1995.

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C, Begelman Mitchell, and United States. National Aeronautics and Space Administration., eds. Radiation pressure-driven magnetic disk winds in broad absorption line quasi-stellar objects. National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Quasars : absorption"

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Turnshek, David A. "Broad Absorption Line QSOs." In Quasars. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4716-0_76.

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Swarup, G., D. J. Saikia, M. Beltrametti, R. P. Sinha, and C. J. Salter. "Absorption Lines and the Radio Structure of Quasars." In Quasars. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4716-0_51.

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Peterson, Bruce A. "QSO Absorption Lines: Heavy Elements and Lyman-α Clouds." In Quasars. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4716-0_130.

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Hunstead, R. W., H. S. Murdoch, J. C. Blades, and M. Pettini. "Absorption spectrum of the z=3.78 QSO 2000-330 at High Resolution." In Quasars. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4716-0_132.

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Blades, J. Chris, Richard W. Hunstead, Hugh S. Murdoch, and Max Pettini. "High Resolution Spectroscopy of Absorption Lines in the Z = 1.7 BL LAC Object 0215+015." In Quasars. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4716-0_133.

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Weymann, Ray. "Broad Absorption Line Quasars: An Overview." In QSO Absorption Lines. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-540-49458-4_45.

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Friaca, Amancio C. S., and Sueli M. Viegas. "Hot Galactic Halos and Lyman Limit Systems of Quasars." In QSO Absorption Lines. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-540-49458-4_94.

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Combes, Françoise, Patrick Boissé, Alain Mazure, and Alain Blanchard. "The Absorption-Line Systems of Quasars." In Galaxies and Cosmology. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-662-03190-2_11.

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Elvis, Martin, and Fabrizio Fiore. "Associated X-Ray Absorption in High Redshift Quasars." In Cold Gas at High Redshift. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1726-2_25.

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Fried, Josef W. "Galaxies Close to the Line of Sight to two z=1 Quasars — Implications for Galactic Halos and Gravitational Lensing." In QSO Absorption Lines. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-540-49458-4_57.

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Conference papers on the topic "Quasars : absorption"

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Ceglowski, M., Magdalena Kunert-Bajraszewska, B. Pazderska, and Marcin Gawronski. "30 GHz monitoring of broad absorption line (BAL) quasars." In 11th European VLBI Network Symposium & Users Meeting. Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.178.0080.

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Danezis, E., L. Č Popović, E. Lyratzi, and M. S. Dimitrijević. "The Peculiar Absorption And Emission Phenomena From Stars To Quasars." In THE PHYSICS OF IONIZED GASES: 23rd Summer School and International Symposium on the Physics of Ionized Gases; Invited Lectures, Topical Invited Lectures and Progress Reports. AIP, 2006. http://dx.doi.org/10.1063/1.2406047.

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RISALITI, G., M. ELVIS, and E. MEMOLA. "X-RAY WEAK QUASARS: ABSORPTION OR AN INTRINSICALLY DIFFERENT SED?" In Proceedings of the Guillermo Haro Conference 2003. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702432_0066.

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Bruni, Gabriele. "Morphology and orientation of radio-loud Broad Absorption Line quasars." In 10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the new generation of radio arrays. Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.125.0036.

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Gawronski, Marcin. "High resolution studies of Broad Absorption Lines radio-loud quasars." In 10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the new generation of radio arrays. Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.125.0037.

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Kunert-Bajraszewska, Magdalena. "Broad absorption line (BAL) quasars as a class of low luminosity AGNs." In 12th European VLBI Network Symposium and Users Meeting. Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.230.0008.

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Danezis, E., E. Lyratzi, L. Č Popović, et al. "Similarity Between DACs∕SACs Phenomena in Hot Emission Stars and Quasars Absorption Lines." In SPECTRAL LINE SHAPES: Volume 15–19th International Conference on Spectral Line Shapes. AIP, 2008. http://dx.doi.org/10.1063/1.3026466.

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Reimer, A. "GeV photon absorption in cosmologically evolving quasar environments." In THE FIRST GLAST SYMPOSIUM. AIP, 2007. http://dx.doi.org/10.1063/1.2757350.

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Chartas, George, Luka Č Popović, and Milan S. Dimitrijević. "X-ray Absorption Line Diagnostics of Quasar Outflows." In SPECTRAL LINE SHAPES IN ASTROPHYSICS: VI Serbi an Conference on Spectral Line Shapes in Astrophysics (VI SCSLSA). AIP, 2007. http://dx.doi.org/10.1063/1.2800150.

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Scaringi, Simone, Christopher E. Cottis, Christian Knigge, Michael R. Goad, and Coryn A. L. Bailer-Jones. "Broad Absorption Line Quasar catalogues with Supervised Neural Networks." In CLASSIFICATION AND DISCOVERY IN LARGE ASTRONOMICAL SURVEYS: Proceedings of the International Conference: “Classification and Discovery in Large Astronomical Surveys”. AIP, 2008. http://dx.doi.org/10.1063/1.3059042.

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Reports on the topic "Quasars : absorption"

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Miniutti, Giovanni, D. R. Ballantyne, S. W. Allen, A. C. Fabian, and R. R. Ross. Fe Emission And Ionized Excess Absorption in the Luminous Quasar 3C109 With XMM-Newton. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/883240.

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