Download or read book The X ray Evolution of Inflows and Outflows in Active Galactic Nuclei written by Cristian Saez and published by . This book was released on 2010 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cosmological Evolution of X ray Emitting Active Galactic Nuclei written by John David Silverman and published by . This book was released on 2004 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book X ray and UV Emission from Active Galactic Nuclei written by Wolfgang Brinkmann and published by . This book was released on 1984 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book X ray Evolution and Variability of Active Galactic Nuclei written by Mathew James Page and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book X Ray Probe of Ultra Fast Outflows in Active Galactic Nuclei written by Francesco Tombesi and published by LAP Lambert Academic Publishing. This book was released on 2012-08 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discuss new recent and exciting results in the field of accretion and ejection physics onto supermassive black holes at the center of active galactic nuclei (AGN). Through a uniform and systematic analysis of the X-ray spectra of a large sample of Seyfert and radio galaxies observed with the XMM-Newton and Suzaku satellites, here we report the statistical significance of blue-shifted Fe K absorption lines at energies higher than 6 keV. A curve of growth analysis and detailed modeling are reported as well. This allows to estimate the general parameters of the associated ultra-fast outflows (UFOs). They are found to be common, highly ionized, massive and with mildly-relativistic velocities. Their location is very close to the accreting supermassive black hole, consistent with being accretion disk outflows. Their mechanical power is also high enough to significantly affect the surrounding environment, therefore contributing to the feedback between the central black hole and the host galaxy. These results have been recently featured in conjunct press releases by NASA, the European Space Agency and the National Italian Institute for Astrophysics.

Download or read book Structure and Evolution of Active Galactic Nuclei written by G. Giuricin and published by Springer. This book was released on 1986-01-31 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of International Meeting held in Trieste, Italy, April 10-13, 1985

Download or read book The Physics and Evolution of Active Galactic Nuclei written by Hagai Netzer and published by Cambridge University Press. This book was released on 2013-09-16 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research into active galactic nuclei (AGN) – the compact, luminous hearts of many galaxies – is at the forefront of modern astrophysics. Understanding these objects requires extensive knowledge in many different areas: accretion disks, the physics of dust and ionized gas, astronomical spectroscopy, star formation, and the cosmological evolution of galaxies and black holes. This new text by Hagai Netzer, a renowned astronomer and leader in the field, provides a comprehensive introduction to the theory underpinning our study of AGN and the ways that we observe them. It emphasizes the basic physics underlying AGN, the different types of active galaxies and their various components, and the complex interplay between them and other astronomical objects. Recent developments regarding the evolutionary connections between active galaxies and star-forming galaxies are explained in detail. Both graduate students and researchers will benefit from Netzer's authoritative contributions to this exciting field of research.

Download or read book X ray Emission from Active Galactic Nuclei written by R. F. Mushotsky and published by . This book was released on 1985 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Big Bang Active Galactic Nuclei and Supernovae Paper written by S. Hayakawa and published by . This book was released on 1989 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Relativistic Flows in Astrophysics written by A.W. Guthmann and published by Springer. This book was released on 2008-01-11 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. 1 Schematic Picture of AGN Some galaxies are known to emit radiation with extremely high luminosities from a rather small volume in the ??ray, X-ray and UV continuum. Such active cores are the so-called Active Galactic Nuclei (AGN) and the radiation is commonly believed to be a result of gravitational energy released by matter spiraling around 9 a supermassive central black hole of about 10 M (see Fig. 1). Though the central engine which produces the enormous observed activity cannot be resolved observationally, a standard picture of an AGN has gradually emerged to explain the richness of the radiation spectra: • an accretion disk with radius from about 2 to 100 gravitational radii, R , g feeding the central black hole and emitting mainly in the UV and soft X-rays; • the broad line optically emitting clouds (BLR), which seem to be absent in 3 some sources (e. g. FRI, see hereafter) and extend up to a few 10 R from g the center.

Download or read book The Physics and Evolution of Active Galactic Nuclei written by Hagai Netzer and published by Cambridge University Press. This book was released on 2013-09-16 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive introduction to the theory underpinning our study of active galactic nuclei and the ways we observe them.

Download or read book Mass Outflow in Active Galactic Nuclei written by D. Michael Crenshaw and published by . This book was released on 2002 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Proceedings of a March 2001 workshop held in Washington, D.C., bringing together an international group of researchers to share new developments in the field during the last four years. Fifty-seven contributions are arranged in sections on X-ray absorption and emission; intrinsic UV absorption; broad absorption-line QSOs; narrow- line region, broad-line region and jets; and kinematics and dynamical models. A sampling of topics: high-resolution X-ray spectroscopy of the warm gas in Seyfert 1 galaxies, observations of warm absorbers in AGN, radio-selected broad absorption line quasars, the importance of shocks in the ionization of the narrow line region of Seyferts, and strong shocks and supersonic winds in homogeneous media. Indexed by author and object, but not by subject. Annotation c. Book News, Inc., Portland, OR (booknews.com)

Download or read book X ray and Multiwavelength Studies of Active Galactic Nuclei from Large Area Sky Surveys written by Jianfeng Wu and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Active galactic nuclei (AGNs) are ideal laboratories for fundamental physics and cosmology. Our knowledge of AGNs has been greatly advanced during the past decades thanks to the unprecedentedly powerful X-ray missions (e.g., Chandra, XMM-Newton, and Swift) and modern large area surveys in the optical/UV band (e.g., the Sloan Digital Sky Survey; SDSS). Studies on the relation between multiwavelength properties of AGNs can reveal the physics of AGN accretion process. In this dissertation, I mainly study the relation between the AGN X-ray properties and their optical/UV spectral properties on emission lines, absorption lines and continuum. I also investigate the X-ray properties of AGNs with extreme radio properties in the early Universe. (1) We studied the X-ray properties of a class of radio-quiet SDSS quasars with weak broad emission lines (weak-line quasars; WLQs). Although the WLQ population shows diverse X-ray properties, they have an excess of X-ray weak sources. Besides having weak emission lines, the X-ray weak WLQs generally show other unusual UV emission-line properties similar to those of the remarkable X-ray weak quasar PHL 1811 (e.g., highly blueshifted C IV lines, weak semi-forbidden lines, and strong UV Fe emission). They are classified as "PHL 1811 analogs". The X-ray weak WLQs also show a harder X-ray spectrum, while the WLQ with normal X-ray brightness have similar X-ray spectral properties to those of typical quasars. We proposed an AGN geometry which can potentially unify the X-ray weak and X-ray normal WLQ populations via orientation effect. The infrared-to-UV spectral energy distributions (SEDs) of X-ray weak and X-ray normal WLQs have consistent SEDs with those for typical quasars, which disfavors the BL Lac-like scenario for the nature of these quasars (Chapters 2 and 3). (2) We have led the best X-ray study to date on quasars with intermediate-width absorption lines (mini-BALs). We found the X-ray brightness of mini-BAL quasars are more close to those of typical quasars than to BAL quasars (which are generally X-ray weak), showing they do not have substantial X-ray absorption. Strong correlations were found between the X-ray brightness and UV absorption parameters, e.g., the absorption strength and maximum outflow velocity. We further proposed new UV absorption parameters which better correlate with the X-ray properties than existing parameters do (Chapter 4). (3) We studied the relation between the optical/UV luminosity and X-ray luminosity (quantified by the alpha_ox parameter) for the most-luminous quasars over a wide range of redshifts. Our correlation analyses provide better constraints on the alpha_ox-UV luminosity correlation. We have also verified that the alpha_ox parameter does not significantly evolve with redshift. We provide the individual and composite mid-infrared-to-UV SEDs for the most-luminous quasars. (Chapter 5). (4) We presented the X-ray and multiwavelength properties of the highly radio-loud quasars (HRLQs) at z > 4. Our HRLQs show a significant enhancement of X-ray emission over those HRLQs at lower redshift with similar optical/UV and radio luminosities, suggesting that the jet-linked X-ray emission mechanism in the early universe may differ from that in the more evolved universe. The optical/UV emission-line strength of RLQs are correlated with radio loudness, but not with relative X-ray brightness. Our HRLQs generally follow the anti-correlation between radio loudness and X-ray power-law photon index. We also studied the broad-band SEDs of HRLQs. Some HRLQs have an excess of mid-infrared emission which may originate from the jet synchrotron emission. None of our z > 4 HRLQs is detected by the Fermi LAT two-year survey (Chapter 6).

Download or read book Studies of X ray Absorption Spectra Due to Active Galactic Nuclei Outflows written by Tomer Holczer and published by . This book was released on 2006 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book X ray Emission from Active Galactic Nuclei written by Richard Mushotzky and published by . This book was released on 1985 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book X ray Cavities in a Sample of 83 SPT selected Clusters of Galaxies written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray cavities are key tracers of mechanical (or radio mode) heating arising from the active galactic nuclei (AGNs) in brightest cluster galaxies (BCGs). Here, we report on a survey for X-ray cavities in 83 massive, high-redshift ($0.4\lt z\lt 1.2$) clusters of galaxies selected by their Sunyaev-Zel'dovich signature in the South Pole Telescope data. Based on Chandra X-ray images, we find a total of six clusters having symmetric pairs of surface brightness depressions consistent with the picture of radio jets inflating X-ray cavities in the intracluster medium (ICM). Furthermore, the majority of these detections are of relatively low significance and require deeper follow-up data in order to be confirmed. Further, this search will miss small (

Download or read book X ray Emission from Active Galactic Nuclei and the Cosmic X ray Background written by Joachim Trumper and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: