Variability Of Active Galactic Nuclei
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Variability Of Active Galactic Nuclei
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Author : Hugh Richard Miller
language : en
Publisher:
Release Date : 1991
Variability Of Active Galactic Nuclei written by Hugh Richard Miller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Science categories.
Active galactic nuclei (AGN), the most powerful objects in the universe, continue to receive a great deal of attention from observational astronomers & theorists. This book collects the results presented at a meeting held at Georgia State University in May 1990 on the topic of variability in active galactic nuclei. It is clear that careful analysis of variability over many wave bands is likely to give clues to the nature of the central engine in AGN. The contributions are grouped in themes: multifrequency variability, UV-optical-IR variability, radio variability, & X-ray variability. One of the most exciting results reported here is that many blazars exhibit micro-variability. There is an important group of papers on NGC 5548 & other Seyfert galaxies. The meeting in Atlanta provided the first opportunity for discussion for those who participated in the worldwide campaign to observe NGC 5548, & new results are also announced for many quasars, Seyfert galaxies, BL Lacertae objects, & radio galaxies. The observational data are interspersed with theoretical insights that enable us to better understand the physical conditions & processes in galactic nuclei, including giant black holes thought to lurk in their cores.
Active Galactic Nuclei
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Author : Volker Beckmann
language : en
Publisher: John Wiley & Sons
Release Date : 2013-08-29
Active Galactic Nuclei written by Volker Beckmann and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-08-29 with Science categories.
Active Galactic Nuclei This AGN textbook gives an overview on the current knowledge of the Active Galacitc Nuclei phenomenon. The spectral energy distribution will be discussed, pointing out what can be observed in different wavebands. The different physical models are presented together with formula important for the understanding of AGN physics. Furthermore, the authors discuss the AGN with respect to its environment, host galaxy, feedback in galaxies and in clusters of galaxies, variability, etc. and finally the cosmological evolution of the AGN phenomenon. This book includes phenomena based on new results in the X-Ray and gamma-ray domain from new telescopes such as Chandra, XMM-Newton, the Fermi Gamma-Ray Space Telescope, and the VHE regime not mentioned so far in AGN books. Those and other new developments as well as simulations of AGN merging events and formations, enabled through latest super-computing capabilities. From the contents: The observational picture of AGN Radiative processes The central engine AGN types and unification AGN through the electromagnetic spectrum AGN variability Environment Quasars and cosmology Formation, evolution and the ultimate fate of AGN What we do not know (yet)
Variability Of Active Galaxies
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Author : Wolfgang J. Duschl
language : en
Publisher: Springer
Release Date : 1991
Variability Of Active Galaxies written by Wolfgang J. Duschl and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Active galaxies categories.
The enormous amounts of energy radiated from the active nuclei of galaxies vary on short time scales, and the emission regions are difficult to observe. To provide a complete understanding of these phenomena a wide variety of studies is presented in this volume. The contributions are broadly divided between line and continuum variability, with observational results, methodological approaches, and theoretical models accompanying each. The final part is devoted to the important aspect of propagation-induced variability.
Variability Of Blazars
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Author : E. VALTAOJA (Ed)
language : en
Publisher: Cambridge University Press
Release Date : 1992
Variability Of Blazars written by E. VALTAOJA (Ed) and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Science categories.
Blazars (also known as BL Lac objects), first discovered in 1978, are unusually energetic objects in the extragalactic universe. About 200 are known or suspected. They are radio sources with highly variable optical and radio emission, as well as high polarisation, and their optical spectra normally have no distinguishable features. It is generally accepted that they belong to that class of galaxies with active galactic nuclei, which are presumed to be driven by infall of matter to a supermassive black hole. In this book researchers give a complete summary of the observations of blazars and the theoretical interpretation. A comprehensive listing of confirmed and candidate objects is included. Mechanisms in which the variability can arise from shocks and relativistic jets are discussed. There are at least four different answers given to the question: what is a blazar? This book is a complete overview of the violent activity observed in these extreme active galactic nuclei.
Variability And Evolution Of The Broad Line Region In Active Galactic Nuclei
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Author : Ignaz Wanders
language : en
Publisher:
Release Date : 1994
Variability And Evolution Of The Broad Line Region In Active Galactic Nuclei written by Ignaz Wanders and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Active galaxies categories.
X Ray Studies Of The Central Engine In Active Galactic Nuclei With Suzaku
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Author : Hirofumi Noda
language : en
Publisher: Springer
Release Date : 2015-12-07
X Ray Studies Of The Central Engine In Active Galactic Nuclei With Suzaku written by Hirofumi Noda and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-07 with Science categories.
The aim of this research was to use the X-ray satellite Suzaku to establish a picture of a central engine that effectively converts the gravitational energy of accreting matter onto the supermassive black hole to a huge amount of radiation in an active galactic nucleus. Although the engine is known to consist of a Comptonizing corona and an accretion disk, its image has remained unclear because primary emissions, coming directly from the engine, cannot be identified in X-ray spectra without models. The book describes a technique of time variability assisted spectral decomposition to model-independently examine X-ray signals, and how this was applied to the Suzaku archive data of active galactic nuclei. As a result, at least three distinct primary X-ray components have been discovered in an X-ray from an active galactic nucleus, presumably indicating a novel picture that the engine is composed of multiple coronae with different physical properties in an accretion flow. Furthermore, the determination of the spectral shapes of the primary X-rays has a significant impact on estimations of black hole spins, because it is essential to quantify reprocessed X-ray spectra. The successful model-independent decomposition of X-ray spectral components with flux variations of active galactic nuclei is likely to be effective in future data analyses from the soon-to-be-launched Japanese X-ray satellite ASTRO-H, which is capable of achieving unprecedented fine spectros copy and broad energy band coverage.
Advanced Lectures On The Starburst Agn Connection
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Author : D. Kunth
language : en
Publisher: World Scientific
Release Date : 2001
Advanced Lectures On The Starburst Agn Connection written by D. Kunth and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Science categories.
A group of leading experts in the field of starbursts and active galactic nuclei have joined hands to produce this review volume which covers the starburst-AGN connection, and the tests to be carried out with the upcoming new astronomical facilities to ascertain the relevance of both components to the formation and evolution of galaxies.The book is addressed to advanced graduate students and researchers in the fields of active galactic nuclei and young galaxies.
An Introduction To Active Galactic Nuclei
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Author : Bradley M. Peterson
language : en
Publisher: Cambridge University Press
Release Date : 1997-02-13
An Introduction To Active Galactic Nuclei written by Bradley M. Peterson and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-02-13 with Science categories.
How can we test if a supermassive black hole lies at the heart of every active galactic nucleus? What are LINERS, BL Lacs, N galaxies, broad-line radio galaxies and radio-quiet quasars and how do they compare? This timely textbook answers these questions in a clear, comprehensive and self-contained introduction to active galactic nuclei - for graduate students in astronomy and physics. The study of AGN is one of the most dynamic areas of contemporary astronomy, involving one fifth of all research astronomers. This textbook provides a systematic review of the observed properties of AGN across the entire electromagnetic spectrum, examines the underlying physics, and shows how the brightest AGN, quasars, can be used to probe the farthest reaches of the Universe. This book serves as both an entry point to the research literature and as a valuable reference for researchers in the field.
Multiwavelength Agn Surveys And Studies Iau S304
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Author : Areg M. Mickaelian
language : en
Publisher: Cambridge University Press
Release Date : 2014-08-21
Multiwavelength Agn Surveys And Studies Iau S304 written by Areg M. Mickaelian and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-08-21 with Science categories.
Active galactic nuclei (AGN) are among the most interesting astrophysical objects in the Universe. IAU Symposium 304, dedicated to marking the centenary of B. E. Markarian's birth, addresses the most important questions in this area: understanding the possible evolutionary and/or physical connections between the different classes of AGN; the relation of AGN to their host galaxies; and understanding the true fraction of heavily obscured AGN in order to determine the true AGN luminosity function and its variation with redshift. This volume's topics include: historical spectral and colorimetric surveys, multiwavelength AGN surveys, AGN statistics, unification and other models of AGN, AGN feedback in galaxies and clusters, their host galaxies and environments, binary AGN and merging supermassive black holes, AGN variability, and future large projects. This fresh summary of AGN surveys is especially useful for researchers engaged in this exciting field and helping them plan for future surveys and observations.
Variability Of Active Galactic Nuclei
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Author :
language : en
Publisher:
Release Date : 1991
Variability Of Active Galactic Nuclei written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Active galaxies categories.