Probing The Physics And Geometry Of Active Galactic Nuclei
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Probing the Geometry and Physics of the Emission Region in Active Galactic Nuclei Using Hard X-ray & Gamma-ray Observations
Author | : |
Publisher | : |
Total Pages | : 22 |
Release | : 2010 |
Genre | : |
ISBN | : |
The X-ray spectra of (almost equal to)200 AGN collected from Swift-BAT were analyzed to test the Unified Model for AGN. Specifically, the photon indices, high energy cutoffs, and reflection components of Sy1 and Sy2 were compared. Under the Unified Model, the photon indices and reflection components for Sy1 should be larger than Sy2 and the high energy cutoffs should be the same. Fitting a simple power law model to the sample spectra proved to be insufficient. The PEXRAV model fit the spectra of the Sy1 and Sy2 significantly better, indicating that a reflection component and/or high energy cutoff exists as the Unified Model expects. Using both the simple power law and PEXRAV models it was concluded that in the population studied, Sy1 had a larger photon index than Sy2, as expected by the Unified Model. For Sy1 and Sy2, the reflection components were found to be compatible, but given the large errors, this finding cannot be said to be evidence against the Unified Model. However, it was concluded that Sy1 and Sy2 have different high energy cutoffs, which is unexpected under the Unified Model.
Probing the Physics of Active Galactic Nuclei by Multiwavelength Monitoring
Author | : Bradley M. Peterson |
Publisher | : |
Total Pages | : 568 |
Release | : 2001 |
Genre | : Science |
ISBN | : |
Annotation Papers from a June 2000 meeting discuss multiwavelength monitoring methods for studying active galactic nuclei, the potential of dedicated facilities for multiwavelength monitoring, and future multiwavelength programs. Some topics discussed are multiwavelength observations of blazars, time delays of blazar flares observed at different wavebands, low radiative-efficiency accretion flows, spectrochronography, and variability of the intrinsic UV absorption lines in Seyfert galaxies. Other topics are the variable diffuse continuum emission of broad-line clouds, the MIDEX concept, and the mission. Peterson teaches astronomy at The Ohio State University. This volume lacks a subject index. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Active Galactic Nuclei
Author | : Volker Beckmann |
Publisher | : John Wiley & Sons |
Total Pages | : 390 |
Release | : 2013-08-29 |
Genre | : Science |
ISBN | : 352766680X |
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)
Physics of Active Galactic Nuclei at all Scales
Author | : Danielle Alloin |
Publisher | : Springer |
Total Pages | : 243 |
Release | : 2006-09-07 |
Genre | : Science |
ISBN | : 354034621X |
This book contains a collection of lecture notes written by recognized experts in the field of Active Galactic Nuclei (AGN). The collection is aimed at providing both an introduction and at the same time an overview of the state-of-the-art of AGN research. This book also addresses the still not entirely understood link of an AGN with its host galaxy and also the related question of the birth and growth of massive black holes in the Universe.
An Introduction to Active Galactic Nuclei
Author | : Bradley M. Peterson |
Publisher | : Cambridge University Press |
Total Pages | : 258 |
Release | : 1997-02-13 |
Genre | : Science |
ISBN | : 9780521479110 |
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.
The Physics and Evolution of Active Galactic Nuclei
Author | : Hagai Netzer |
Publisher | : Cambridge University Press |
Total Pages | : 369 |
Release | : 2013-09-16 |
Genre | : Science |
ISBN | : 1107021510 |
A comprehensive introduction to the theory underpinning our study of active galactic nuclei and the ways we observe them.
Physics of Active Galactic Nuclei at all Scales
Author | : Danielle Alloin |
Publisher | : Springer |
Total Pages | : 234 |
Release | : 2009-09-02 |
Genre | : Science |
ISBN | : 9783540819530 |
This book contains a collection of lecture notes written by recognized experts in the field of Active Galactic Nuclei (AGN). The collection is aimed at providing both an introduction and at the same time an overview of the state-of-the-art of AGN research. This book also addresses the still not entirely understood link of an AGN with its host galaxy and also the related question of the birth and growth of massive black holes in the Universe.
Physics of Active Galactic Nuclei
Author | : Wolfgang J. Duschl |
Publisher | : Springer |
Total Pages | : 746 |
Release | : 1992 |
Genre | : Science |
ISBN | : |
Active Galactic Nuclei
Author | : Professor R. D. Blandford |
Publisher | : Springer |
Total Pages | : 289 |
Release | : 2013-12-14 |
Genre | : Science |
ISBN | : 3662398168 |