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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 : Bradley M. Peterson
Publisher : Cambridge University Press
ISBN 13 : 9780521479110
Total Pages : 258 pages
Book Rating : 4.4/5 (791 download)
Download or read book An Introduction to Active Galactic Nuclei written by Bradley M. Peterson and published by Cambridge University Press. This book was released on 1997-02-13 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
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 : Wade H. Shafer
Publisher : Springer Science & Business Media
ISBN 13 : 1461524539
Total Pages : 391 pages
Book Rating : 4.4/5 (615 download)
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the though that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemi nation. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 37 (thesis year 1992) a total of 12,549 thesis titles from 25 Canadian and 153 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 37 reports theses submitted in 1992, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
Author : G. Giuricin
Publisher : Springer
ISBN 13 :
Total Pages : 808 pages
Book Rating : 4.X/5 (1 download)
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
Author : Jackson Eugene DeBuhr
Publisher :
ISBN 13 :
Total Pages : 322 pages
Book Rating : 4.:/5 (81 download)
Download or read book Numerical Models of Galaxy Evolution written by Jackson Eugene DeBuhr and published by . This book was released on 2012 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores two topics in contemporary galaxy evolution using numerical models and N-body simulation: feedback in active galactic nuclei and the heating of stellar disks. Two numerical models of feedback from active galactic nuclei are developed and applied to the case of a major merger between two disk galaxies. Accretion into central black holes is modeled via a subgrid prescription based on angular momentum transport on unresolved scales. Feedback from black holes is modeled in two ways, both of which deposit a momentum [tau] L / c into the surroundings, where L is the luminosity of radiation produced by the galactic nucleus. In the first model, the momentum is divided equally among the nearby gas particles to model processes like the absorption of ultraviolet light by dust grains. The second model deposits the same amount of momentum into the surroundings, but it does so by launching a wind with a fixed speed, which only has a direct effect on a small fraction of the gas in the black hole's vicinity. Both models successfully regulate the growth of the black hole, reproducing, for example, the MBH-[sigma] relationship, albeit for large amounts of momentum deposition (large [tau]). This regulation is largely independent of the fueling model employed, and thus is d̀emand limited' black hole growth, rather than a s̀upply limited' mode. However, only the model that implements an active galactic nucleus wind explicitly has an effect on large scales, quenching star formation in the host galaxy, and driving a massive galaxy-scale outflow. In a separate set of calculations, a method for including a stellar disk in cosmological zoom-in simulation is presented and applied to a set of realistic dark matter halos taken from the Aquarius suite of simulations. The halos are adiabatically adjusted from z = 1.3 to z = 1.0 by a rigid disk potential, at which point the rigid potential is replaced with a live stellar disk of particles. The halos respond to the disks, in every orientation simulated, by contracting in their central regions and by becoming oblate instead of prolate. The resulting disks, with few exceptions, form large bars which contain a fair fraction of the mass of the disk. These bars buckle and dominate the dynamics of the disk, increasing not only the scale height of the disk, but also the vertical velocity dispersion. During the simulations, the disks tumble coherently with their host halo, but can leave the outermost edges of the disk behind, creating streams that are far out of the plane of the disk. Some first steps are taken to relate the evolution of the disk to the substructure in the halo, but the situation is complicated by the massive bar.
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 :
Publisher :
ISBN 13 :
Total Pages : 652 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : Julian H. Krolik
Publisher : Princeton University Press
ISBN 13 : 0691011516
Total Pages : 628 pages
Book Rating : 4.6/5 (91 download)
Download or read book Active Galactic Nuclei written by Julian H. Krolik and published by Princeton University Press. This book was released on 1999-01-10 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first comprehensive treatment of active galactic nuclei--the cosmic powerhouses at the core of many distant galaxies. The term active galactic nuclei refers to quasars, radio galaxies, Seyfert galaxies, blazars, and related objects, all of which are believed to share a similar central engine--a supermassive black hole many times the mass of the Sun. Astrophysicists have studied these phenomena for the past several decades and have begun to develop a consensus about many of their properties and internal mechanisms. Julian Krolik, one of the world's leading authorities on the subject, sums up leading ideas from across the entire range of research, making this book an invaluable resource for astronomers, physicists interested in applications of the theory of gravitation, and graduate students. Krolik begins by addressing basic questions about active galactic nuclei: What are they? How can they be found? How do they evolve? He assesses the evidence for massive black holes and considers how they generate power by accretion. He discusses X-ray and g-ray emission, radio emission and jets, emission and absorption lines, anisotropic appearance, and the relationship between an active nucleus and its host galaxy. He explores the mysteries of what ignites, fuels, and extinguishes active galactic nuclei, and concludes with a general review of where the field now stands. The book is unique in paying careful attention to relevant physics as well as astronomy, reflecting in part the importance of general relativity to understanding active galactic nuclei. Clear, authoritative, and detailed, this is crucial reading for anyone interested in one of the most dynamic areas of astrophysics today.
Author :
Publisher :
ISBN 13 :
Total Pages : 137 pages
Book Rating : 4.:/5 (873 download)
Download or read book Simulating the Growth of a Disk Galaxy and Its Supermassive Black Hole in a Cosmological Simulating the Growth of a Disk Galaxy and Its Supermassive Black Hole in a Cosmological Context written by and published by . This book was released on 2008 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supermassive black holes (SMBHs) are ubiquitous in the centers of galaxies. Their formation and subsequent evolution is inextricably linked to that of their host galaxies, and the study of galaxy formation is incomplete without the inclusion of SMBHs. The present work seeks to understand the growth and evolution of SMBHs through their interaction with the host galaxy and its environment. In the first part of the thesis (Chap. 2 and 3), we combine a simple semi-analytic model of outflows from active galactic nuclei (AGN) with a simulated dark matter density distribution to study the impact of SMBH feedback on cosmological scales. We find that constraints can be placed on the kinetic efficiency of such feedback using observations of the filling fraction of the Ly[alpha] forest. We also find that AGN feedback is energetic enough to redistribute baryons over cosmological distances, having potentially significant effects on the interpretation of cosmological data which are sensitive to the total matter density distribution (e.g. weak lensing). However, truly assessing the impact of AGN feedback in the universe necessitates large-dynamic range simulations with extensive treatment of baryonic physics to first model the fueling of SMBHs. In the second part of the thesis (Chap. 4-6) we use a hydrodynamic adaptive mesh refinement simulation to follow the growth and evolution of a typical disk galaxy hosting a SMBH, in a cosmological context. The simulation covers a dynamical range of 10 million allowing us to study the transport of matter and angular momentum from super-galactic scales all the way down to the outer edge of the accretion disk around the SMBH. Focusing our attention on the central few hundred parsecs of the galaxy, we find the presence of a cold, self-gravitating, molecular gas disk which is globally unstable. The global instabilities drive super-sonic turbulence, which maintains local stability and allows gas to fuel a SMBH without first fragmenting completely into stars. The fueling appears to be a stochastic process, with no preferred timescale for accretion over the duration of the simulation.
Author : W. H. Shafer
Publisher : Springer Science & Business Media
ISBN 13 : 9780306447112
Total Pages : 410 pages
Book Rating : 4.4/5 (471 download)
Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 1994 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 37 (thesis year 1992) reports a total of 12,549 thesis titles from 25 Canadian and 153 US universities (theses submitted in previous years but only now reported are indicated by the thesis year shown in parenthesis). The organization, like that of past years, consists of thesis titles arrange
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 :
Publisher :
ISBN 13 :
Total Pages : 688 pages
Book Rating : 4.3/5 (91 download)
Download or read book NASA Conference Publication written by and published by . This book was released on 1988 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. Neil Johnson
Publisher :
ISBN 13 :
Total Pages : 764 pages
Book Rating : 4.3/5 (91 download)
Download or read book Proceedings of the Gamma Ray Observatory Science Workshop written by W. Neil Johnson and published by . This book was released on 1989 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. Böhme
Publisher : Springer Science & Business Media
ISBN 13 : 3662123436
Total Pages : 947 pages
Book Rating : 4.6/5 (621 download)
Download or read book Literature 1984, Part 1 written by S. Böhme and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 947 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Francoise Combes
Publisher : John Wiley & Sons
ISBN 13 : 178945087X
Total Pages : 324 pages
Book Rating : 4.7/5 (894 download)
Download or read book Active Galactic Nuclei written by Francoise Combes and published by John Wiley & Sons. This book was released on 2022-09-21 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: All galaxies host a super-massive black hole in their center. These black holes grow their mass in symbiosis with their host galaxy and moderate their star formation. When matter is driven towards the nucleus, an accretion disk is formed to transfer angular momentum and considerable energy is released when the material falls into the black hole: this is the phenomenon of active galactic nuclei (AGN). A nucleus can shine one thousand times more brightly than the entire galaxy with its 200 billion stars. The nuclear activity can take many forms, from very powerful quasars to more ordinary Seyfert galaxies, passing by radio-galaxies, which eject a collimated plasma at ten times the radius of the galaxy. This book examines all of these manifestations and presents a unified view. When two galaxies merge, a binary black hole is formed and the two black holes will spiral inwards and merge, emitting long gravitational waves, which could be detected by the future LISA satellite.
Author : Ignacio González Martínez-País
Publisher : Cambridge University Press
ISBN 13 : 1107067634
Total Pages : 313 pages
Book Rating : 4.1/5 (7 download)
Download or read book Accretion Processes in Astrophysics written by Ignacio González Martínez-País and published by Cambridge University Press. This book was released on 2014-02-17 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been more than fifty years since the first significant paper on accretion flows was written. In recent years, X-ray satellites capable of identifying accretion disks and radiation jets - indications that accretion has taken place - have significantly advanced our understanding of these phenomena. This volume presents a comprehensive and up-to-date introduction to the major theoretical and observational topics associated with accretion processes in astrophysics. Comprising lectures presented at the twenty-first Winter School of the Canary Islands Institute of Astrophysics, the text emphasises the physical aspects of accretion, investigating how radiation jets are produced, how accretion power is divided between jets and radiated energy, the geometry of accretion flow, and the accretion processes of active galactic nuclei. Written by an international team of experienced scientists, chapters offer young researchers key analytical tools for supporting and carrying out the next generation of front-line research.
