Probing The Physics Of Active Galactic Nuclei By Multiwavelength Monitoring
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Probing The Physics Of Active Galactic Nuclei By Multiwavelength Monitoring
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Author : Bradley M. Peterson
language : en
Publisher:
Release Date : 2001
Probing The Physics Of Active Galactic Nuclei By Multiwavelength Monitoring written by Bradley M. Peterson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Science categories.
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)
Probing The Geometry And Physics Of The Emission Region In Active Galactic Nuclei Using Hard X Ray Gamma Ray Observations
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Author :
language : en
Publisher:
Release Date : 2010
Probing The Geometry And Physics Of The Emission Region In Active Galactic Nuclei Using Hard X Ray Gamma Ray Observations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
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.
Relativistic Jets From Active Galactic Nuclei
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Author : Markus Boettcher
language : en
Publisher: John Wiley and Sons
Release Date : 2012-02-13
Relativistic Jets From Active Galactic Nuclei written by Markus Boettcher and has been published by John Wiley and Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-13 with Science categories.
Written by a carefully selected consortium of researchers working in the field, this book fills the gap for an up-to-date summary of the observational and theoretical status. As such, this monograph includes all used wavelengths, from radio to gamma, the FERMI telescope, a history and theory refresher, and jets from gamma ray bursts. For astronomers, nuclear physicists, and plasmaphysicists.
The Physics And Evolution Of Active Galactic Nuclei
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Author : Hagai Netzer
language : en
Publisher: Cambridge University Press
Release Date : 2013-09-16
The Physics And Evolution Of Active Galactic Nuclei written by Hagai Netzer 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 2013-09-16 with Science categories.
A comprehensive introduction to the theory underpinning our study of active galactic nuclei and the ways we observe them.
X Ray Probe Of Ultra Fast Outflows In Active Galactic Nuclei
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Author : Francesco Tombesi
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2012-08
X Ray Probe Of Ultra Fast Outflows In Active Galactic Nuclei written by Francesco Tombesi and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08 with categories.
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.
The Optical Variability Of Active Galactic Nuclei
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Author : Jackeline Moreno
language : en
Publisher:
Release Date : 2019
The Optical Variability Of Active Galactic Nuclei written by Jackeline Moreno and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Active galactic nuclei categories.
Active Galactic Nuclei (AGN) exhibit strong, rapid optical luminosity fluctuations that are often described as stochastic (exhibiting intrinsic randomness). The physical mechanisms that produce stochastic fluctuations may be studied by characterizing the correlation structure of such data in both the time domain and the frequency domain. We find evidence that AGN do not exhibit a universal optical PSD; the PSD shape (or light curve correlation structure) may be a function of fundamental AGN properties. In this work, we develop an application of continuous-time autoregressive moving average models (CARMA) to AGN optical light curves, and we discuss their relationships to more traditional techniques such as the structure function (SF) and the power spectral density (PSD). We present a study of AGN variability using the Damped Harmonic Oscillator (DHO) or CARMA(2,1) model. We estimate DHO timescales and optical variability amplitudes for 7492 objects with both SDSS (Stripe 82) r-band and CRTS V-band light curves. We employ clustering methods (t-distributed stochastic neighbor embedding) in this work to test the non-universality of AGN variability (deviations from the damped random walk; DRW or CARMA(1,0)). This approach groups together light curves with similar correlation structure as described by DHO timescales. We identify three classes of AGN variability. We find a "long memory" variability class characterized by milder variability amplitudes ($\sim12\%$) and steeper SFs than DRWs. We also detect a variability class characterized by an excess of short timescale variability ($
Astrophysics Of Quasi Stellar Objects And Active Galactic Nuclei
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Author : Joseph S. Miller
language : en
Publisher: University Science Books
Release Date : 1985
Astrophysics Of Quasi Stellar Objects And Active Galactic Nuclei written by Joseph S. Miller and has been published by University Science Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Science categories.
"Based on the 1984 Santa Cruz Astrophysics Workshop"--Verso t.p.
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.
Astrophysics Update
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Author : John Mason
language : en
Publisher: Springer Science & Business Media
Release Date : 2003-12-02
Astrophysics Update written by John Mason and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-12-02 with Science categories.
Written by leading exponents in the field, this collection of timely reviews presents observational methods and the latest results of astronomical research as well as their theoretical foundations and interrelations, providing information and scientifically rigorous coverage.
The Interplay Among Black Holes Stars And Ism In Galactic Nuclei Iau S222
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Author : International Astronomical Union. Symposium
language : en
Publisher: Cambridge University Press
Release Date : 2004
The Interplay Among Black Holes Stars And Ism In Galactic Nuclei Iau S222 written by International Astronomical Union. Symposium 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 2004 with Science categories.
How massive are the largest and smallest nuclear black holes in galaxies? Why are the masses of nuclear black holes proportional to those of their host galaxy bulges? How is nuclear activity triggered? What are the observational signatures of such processes? What are the connections between the active nucleus, stars and interstellar medium in galaxies? Answers to these questions are addressed in this book, which presents a compilation of 191 works covering recent observations from X-rays to radio wavelengths, as well as theoretical modeling of accretion disks, stellar populations and galaxy and black hole evolution. This volume presents the nuclear activity as a phase in the life of a galaxy, which is intimately connected to the evolution of its stars and interstellar medium. It brings together recent developments in topics covering most aspects of galaxy evolution, and is a valuable resource for astronomers and graduate students working in extragalactic astronomy.