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Author : Thomas M. Walter
Publisher :
ISBN 13 :
Total Pages : 117 pages
Book Rating : 4.:/5 (723 download)
Download or read book Sandwich Accretion Disk Models for Active Galactic Nuclei written by Thomas M. Walter and published by . This book was released on 1998 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. Meyer
Publisher : Springer
ISBN 13 :
Total Pages : 504 pages
Book Rating : 4.F/5 ( download)
Download or read book Theory of Accretion Disks written by F. Meyer and published by Springer. This book was released on 1989-09-30 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Garching, Germany, March 6-10, 1989
Author : Wei-Hsin Sun
Publisher :
ISBN 13 :
Total Pages : 392 pages
Book Rating : 4.:/5 (173 download)
Download or read book Accretion Disk Models of Quasars and Active Galactic Nuclei written by Wei-Hsin Sun and published by . This book was released on 1987 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yihu Fang
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (284 download)
Download or read book A model for dynamic evolution of active galactic nuclei accretion disks written by Yihu Fang and published by . This book was released on 1992 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C. BERTOUT (Ed)
Publisher : Atlantica Séguier Frontières
ISBN 13 : 9782863320938
Total Pages : 600 pages
Book Rating : 4.3/5 (29 download)
Download or read book Structure and Emission Properties of Accretion Disks written by C. BERTOUT (Ed) and published by Atlantica Séguier Frontières. This book was released on 1991 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wakiko Ishibashi
Publisher :
ISBN 13 :
Total Pages : 177 pages
Book Rating : 4.:/5 (14 download)
Download or read book Accretion Models in Active Galactic Nuclei written by Wakiko Ishibashi and published by . This book was released on 2011 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Laura Susana Chajet
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (136 download)
Download or read book Disc Winds and Line-Width Distributions in Active Galactic Nuclei written by Laura Susana Chajet and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study Active Galactic Nucleus (AGN) emission-line profiles by combining an improved version of the accretion disc-wind model of Murray & Chiang with the magnetohydrodynamic model of Emmering et al. We consider central objects with different masses and/or luminosities. We show how the shape, broadening and shift of the C IV line depend not only on the viewing angle to the object but also on the wind launching angle, especially for small launching angles. We have compared the dispersions in our model C IV line-width distributions to observational upper limits on that dispersion, considering both smooth and clumpy torus models. Following Fine et al., we transform that scatter in the profile line-widths into a constraint on the torus geometry. We show how the half-opening angle of the obscuring structure depends on the mass and luminosity of the central object.
Author : Emmi Meyer-Hofmeister
Publisher :
ISBN 13 : 9783662141410
Total Pages : 376 pages
Book Rating : 4.1/5 (414 download)
Download or read book Accretion Disks - New Aspects written by Emmi Meyer-Hofmeister and published by . This book was released on 2014-01-15 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Emily Down
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book The Orientation of Accretion Disks and Jets in Quasars written by Emily Down and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: All massive nearby galaxies, including our own, host supermassive black holes. Active galactic nuclei (AGN) are seen when such black holes accrete, and when they produce powerful jets of synchrotron-emitting plasma, they are termed radio-loud AGN. The close correlation between black hole mass and galaxy bulge mass in elliptical galaxies indicates that AGN feedback may be the key to the regulation of galaxy formation. It is thus necessary to fully understand the structure of AGN, the way that they are fuelled, and their duty cycle, in order to study the feedback processes and get a clear picture of galaxy formation. In this thesis, independent methods are developed to constrain the accretion disk and radio jet angles to the line of sight. H IX emission from a sub-sample of high-redshift quasars is measured from near-infrared spectroscopy and modelled as sums of different components, including the characteristic double-peaked profile which results from a thin, rotating accretion disk. Comparing the models using Bayesian evidence, almost all quasars were found to have infrared spectra consistent with the presence of a disk. The jet inclination angles of the same set of quasars were constrained by fitting a model, including the effect of Doppler boosting and the receding torus model for dust obscuration, to the radio \ spectral energy distribution. The fitted disk and jet angles correlate strongly, and are consistent with a model in which the radio jets are launched orthogonally to the plane of the accretion disk, as expected if the jet is powered by energy drawn from the spin of the black hole. Both disk and jet angles correlate with the observed linear source size, which is a projection effect; when deprojected using the fitted angles, the distribution of source sizes agrees with a scenario in which the sources expand into the surrounding medium at a constant rate up to ~ 1 Mpc and then shut off, probably as the nuclei become quiescent. The accretion disk angle was found to correlate weakly with the low-frequency radio luminosity, which provides direct, albeit tenuous, evidence for the receding torus model.
Author : Samuel W. Mangham
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book The Reverberation Signatures of Accretion Disk Winds in Active Galactic Nuclei written by Samuel W. Mangham and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sean Michael Smith
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (345 download)
Download or read book A Critical Test of the Thin Accretion Disk Models for Active Galaxies written by Sean Michael Smith and published by . This book was released on 1995 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Courvoisier
Publisher :
ISBN 13 :
Total Pages : 430 pages
Book Rating : 4.3/5 (243 download)
Download or read book Active Galactic Nuclei written by T. Courvoisier and published by . This book was released on 1992 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hirofumi Noda
Publisher : Springer
ISBN 13 : 9812877215
Total Pages : 164 pages
Book Rating : 4.8/5 (128 download)
Download or read book X-ray Studies of the Central Engine in Active Galactic Nuclei with Suzaku written by Hirofumi Noda and published by Springer. This book was released on 2015-12-07 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Anderson Caproni
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.3/5 (91 download)
Download or read book Observational Evidence of Spin-induced Precession in Active Galactic Nuclei written by Anderson Caproni and published by . This book was released on 2004 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Emmi Meyer-Hofmeister
Publisher : Springer
ISBN 13 : 9783540628668
Total Pages : 358 pages
Book Rating : 4.6/5 (286 download)
Download or read book Accretion Disks — New Aspects written by Emmi Meyer-Hofmeister and published by Springer. This book was released on 1997-06-19 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most luminous compact objects are powered by accretion of mass. Accretion disks are the one common and fundamental element of these sources on widely different scales, ranging from close stellar binaries, galactic black holes and X-ray pulsars to active galactic nuclei (AGN). Key new developments in theory and observations, reviewed by experts in the field, are presented in this book. The contributions to the workshop cover the puzzles presented by the X-UV spectra of AGN and their variability, the recent numerical simulations of magnetic fields in disks, the remarkable behavior of the superluminal source 1915+105 and the "bursting pulsar" 1744-28, to mention a few of the topics.
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (873 download)
Download or read book Star-disk Collisions in Active Galactic Nuclei and the Origin of the Broad Line Region written by and published by . This book was released on 1991 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.3/5 (91 download)
Download or read book Warping and Precession in Galactic and Extragalactic Accretion Disks written by and published by . This book was released on 2006 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
