Accretion And Winds

Author : Vasily S. Beskin
Publisher : Springer Science & Business Media
Page : 425 pages
File Size : 52,7 Mb
Release : 2009-12-08
Category : Science
ISBN : 9783642012907

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MHD Flows in Compact Astrophysical Objects by Vasily S. Beskin Pdf

Accretion flows, winds and jets of compact astrophysical objects and stars are generally described within the framework of hydrodynamical and magnetohydrodynamical (MHD) flows. Analytical analysis of the problem provides profound physical insights, which are essential for interpreting and understanding the results of numerical simulations. Providing such a physical understanding of MHD Flows in Compact Astrophysical Objects is the main goal of this book, which is an updated translation of a successful Russian graduate textbook. The book provides the first detailed introduction into the method of the Grad-Shafranov equation, describing analytically the very broad class of hydrodynamical and MHD flows. It starts with the classical examples of hydrodynamical accretion onto relativistic and nonrelativistic objects. The force-free limit of the Grad-Shafranov equation allows us to analyze in detail the physics of the magnetospheres of radio pulsars and black holes, including the Blandford-Znajek process of energy extraction from a rotating black hole immersed in an external magnetic field. Finally, on the basis of the full MHD version of the Grad-Shafranov equation the author discusses the problems of jet collimation and particle acceleration in Active Galactic Nuclei, radio pulsars, and Young Stellar Objects. The comparison of the analytical results with numerical simulations demonstrates their good agreement. Assuming that the reader is familiar with the basic physical and mathematical concepts of General Relativity, the author uses the 3+1 split approach which allows the formulation of all results in terms of physically clear language of three dimensional vectors. The book contains detailed derivations of equations, numerous exercises, and an extensive bibliography. It therefore serves as both an introductory text for graduate students and a valuable reference work for researchers in the field.

Author : Gerhard Klare
Publisher : Springer Science & Business Media
Page : 378 pages
File Size : 49,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9783642762383

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Accretion and Winds by Gerhard Klare Pdf

In order to bring the scientific events of the meetings of the Astronomische Gesellschaft (AG) to the attention of the worldwide astronomical community, an annual publication, Reviews in Modern Astronomy, was established. It is devoted exclusively to . the invited reviews, the Karl Schwarz schild lectures, and the high light contributions from leading scientists reporting on recent progress and scientific achievements at their respective institutes. This third volume continues the yearbook series of publications of the society. It comprises the complete set of contributions presented during the spring meeting of the AG at Berlin in March 1990, which was dedicated to the topic "Accretion and Winds". In addition four latecomers (two review and two highlight papers) delivered at the fall meeting at Graz, Austria in September 1989 close this volume. Heidelberg, September 1990 G: Klare Contents Some New Elements in Accretion Disk Theory By F. Meyer (With 5 Figures) . . . . . . . . . . . . . . . . . . . . . . . 1 Mass Transfer and Evolution in Close Binaries By A. R. King (With 4 Figures) . . . . . . . . . . . . . . . . . . . . . . . 14 Radiation Hydrodynamics of the Boundary Layer of Accretion Disks in Cataclysmic Variables By W. Kley (With 6 Figures) . . . . . . . . . . . . . . . . . . . . . . . . 21 Curious Observations of Cataclysmic Variables By F. V. Hessman (With 10 Figures) . . . . . . . . . . . . . . . . . . . 32 Accretion in AM Herculis Stars 44 By A. D. Schwope (With 12 Figures) X-ray Diagnostics of Accretion Disks By G. Hasinger (With 12 Figures) . . . . . . . . . . . . . . . . . . . . . 60 Accretion Phenomena at Neutron Stars By A. Rebetzky, H. Herold, U. Kraus, H. -P. Nollert, and H. Ruder (With 13 Figures) . . . . . . . . . . . . . . . . . . . . . .

Author : Gerhard Klare
Publisher : Springer Verlag
Page : 370 pages
File Size : 46,8 Mb
Release : 1990
Category : Accretion (Astrophysics)
ISBN : 0387533648

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Accretion and Winds by Gerhard Klare Pdf

Author : Ronald Everett Taam,Bruce A. Fryxell
Publisher : Unknown
Page : 7 pages
File Size : 45,9 Mb
Release : 1989
Category : Astronomy
ISBN : OCLC:1026728983

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The Hydrodynamics of accretion from stellar winds by Ronald Everett Taam,Bruce A. Fryxell Pdf

Author : Pranab Ghosh
Publisher : World Scientific
Page : 793 pages
File Size : 42,5 Mb
Release : 2007
Category : Science
ISBN : 9789812708465

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Rotation and Accretion Powered Pulsars by Pranab Ghosh Pdf

This book is an introduction to pulsars, a key area in high energy astrophysics with continuing potential for fundamental discoveries. Throughout the book runs the unifying thread of the evolutionary link between rotation-powered pulsars and accretion-powered pulsars OCo a milestone of modern astrophysics. Early textbooks on pulsars dealt almost entirely with rotation-powered ones, while accounts of pulsars in volumes on X-ray binaries focused almost exclusively on accretion-powered ones. This is the first textbook to treat these two kinds of pulsars simultaneously with equal importance, stressing the fact that both are rotating, magnetic neutron stars, operating under different conditions during different parts of their lives. It describes the observational properties of both kinds of pulsars, summarizes our physical understanding of these properties, and pays detailed attention to the physics of superdense matter which neutron stars are composed of, as well as to the superfluidity which is expected to occur in neutron stars. Evolution from rotation-power to accretion-power, and vice versa, are carefully described. The effects of the strong magnetic fields of neutron stars on themselves, their emission properties, and their environments are discussed, as are the origin and evolution of such magnetic fields. Also treated is the superbly accurate verification of Einstein''s theory of general relativity through timing studies of binary pulsars, which led to the award of the Nobel Prize to Hulse and Taylor in 1993. On each topic, the book starts with simple, basic physical concepts, and builds up the exposition to the point where the latest and most exciting developments become accessible to the reader."

Author : Lee Hartmann
Publisher : Cambridge University Press
Page : 260 pages
File Size : 43,5 Mb
Release : 2000-11-15
Category : Science
ISBN : 0521785200

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Accretion Processes in Star Formation by Lee Hartmann Pdf

This first comprehensive account of the dynamical processes in the formation of stars and disks from which planets ultimately form.

Author : Jack Randolph Jokipii,Charles P. Sonett,Mark S. Giampapa
Publisher : University of Arizona Press
Page : 1060 pages
File Size : 46,8 Mb
Release : 1997-10
Category : Science
ISBN : 0816518254

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Cosmic Winds and the Heliosphere by Jack Randolph Jokipii,Charles P. Sonett,Mark S. Giampapa Pdf

Contributors examine the physics of wind origin and physical phenomena in winds, including heliospheric shocks, magnetohydrodynamic turbulence, and kinetic phenomena--and their interactions with surrounding media. Contributions range from studies of the interstellar cloud surrounding the solar system to solar wind interaction with comets.

Author : Lex Kaper,Alexander W. Fullerton
Publisher : Springer Science & Business Media
Page : 426 pages
File Size : 55,8 Mb
Release : 2013-06-05
Category : Science
ISBN : 9783540685975

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Cyclical Variability in Stellar Winds by Lex Kaper,Alexander W. Fullerton Pdf

It is well known that stellar winds are variable, and the fluctuations are often cyclical in nature. This property seems to be shared by the winds of cool and hot stars, even though their outflows are driven by fundamentally different physical mechanisms. Since very similar models have been proposed to explain the cyclical wind variations observed in a wide variety of stars, the time was ripe for astrophysicists from many different sub-disciplines to present the state of the art in a concise form. The proceedings will provide a useful, up-to-date overview of the observations, interpretation, and modelling of the time-dependent mass outflows from all sorts of stars.

Author : James Matthews
Publisher : Springer
Page : 210 pages
File Size : 42,6 Mb
Release : 2017-08-01
Category : Science
ISBN : 9783319591834

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Disc Winds Matter by James Matthews Pdf

This thesis describes the application of a Monte Carlo radiative transfer code to accretion disc winds in two types of systems spanning 9 orders of magnitude in mass and size. In both cases, the results provide important new insights. On small scales, the presence of disc winds in accreting white dwarf binary systems has long been inferred from the presence of ultraviolet absorption lines. Here, the thesis shows that the same winds can also produce optical emission lines and a recombination continuum. On large scales, the thesis constructs a simple model of disc winds in quasars that is capable of explaining both the observed absorption and emission signatures – a crucial advance that supports a disc-wind based unification scenario for quasars. Lastly, the thesis also includes a theoretical investigation into the equivalent width distribution of the emission lines in quasars, which reveals a major challenge to all unification scenarios.

Author : Juhan Frank,A. R. King,Derek Raine
Publisher : Cambridge University Press
Page : 390 pages
File Size : 41,8 Mb
Release : 2002-01-17
Category : Science
ISBN : 0521629578

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Accretion Power in Astrophysics by Juhan Frank,A. R. King,Derek Raine Pdf

Accretion Power in Astrophysics examines accretion as a source of energy in both binary star systems containing compact objects, and in active galactic nuclei. Assuming a basic knowledge of physics, the authors describe the physical processes at work in accretion discs and other accretion flows. The first three chapters explain why accretion is a source of energy, and then present the gas dynamics and plasma concepts necessary for astrophysical applications. The next three chapters then develop accretion in stellar systems, including accretion onto compact objects. Further chapters give extensive treatment of accretion in active galactic nuclei, and describe thick accretion discs. A new chapter discusses recently discovered accretion flow solutions. The third edition is greatly expanded and thoroughly updated. New material includes a detailed treatment of disc instabilities, irradiated discs, disc warping, and general accretion flows. The treatment is suitable for advanced undergraduates, graduate students and researchers.

Author : Maurizio Falanga,Tomaso Belloni,Piergiorgio Casella,Marat Gilfanov,Peter Jonker,Andrew King
Publisher : Springer
Page : 489 pages
File Size : 40,9 Mb
Release : 2014-10-28
Category : Science
ISBN : 9781493922277

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The Physics of Accretion onto Black Holes by Maurizio Falanga,Tomaso Belloni,Piergiorgio Casella,Marat Gilfanov,Peter Jonker,Andrew King Pdf

Provides a comprehensive summary on the physical models and current theory of black hole accretion, growth and mergers, in both the supermassive and stellar-mass cases. This title reviews in-depth research on accretion on all scales, from galactic binaries to intermediate mass and supermassive black holes. Possible future directions of accretion are also discussed. The following main themes are covered: a historical perspective; physical models of accretion onto black holes of all masses; black hole fundamental parameters; and accretion, jets and outflows. An overview and outlook on the topic is also presented. This volume summarizes the status of the study of astrophysical black hole research and is aimed at astrophysicists and graduate students working in this field. Originally published in Space Science Reviews, Vol 183/1-4, 2014.

Author : Alice K. Harding
Publisher : Unknown
Page : 48 pages
File Size : 51,5 Mb
Release : 1990
Category : Government publications
ISBN : IND:30000066337100

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Acceleration by Pulsar Winds in Binary Systems by Alice K. Harding Pdf

Author : Ignacio González Martínez-País,Tariq Shahbaz,Jorge Casares Velázquez
Publisher : Cambridge University Press
Page : 313 pages
File Size : 46,6 Mb
Release : 2014-02-17
Category : Science
ISBN : 9781107030190

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Accretion Processes in Astrophysics by Ignacio González Martínez-País,Tariq Shahbaz,Jorge Casares Velázquez Pdf

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.

Author : Andrew Fox,Romeel Davé
Publisher : Springer
Page : 373 pages
File Size : 53,5 Mb
Release : 2017-03-23
Category : Science
ISBN : 9783319525129

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Gas Accretion onto Galaxies by Andrew Fox,Romeel Davé Pdf

This edited volume presents the current state of gas accretion studies from both observational and theoretical perspectives, and charts our progress towards answering the fundamental yet elusive question of how galaxies get their gas. Understanding how galaxies form and evolve has been a central focus in astronomy for over a century. These studies have accelerated in the new millennium, driven by two key advances: the establishment of a firm concordance cosmological model that provides the backbone on which galaxies form and grow, and the recognition that galaxies grow not in isolation but within a “cosmic ecosystem” that includes the vast reservoir of gas filling intergalactic space. This latter aspect in which galaxies continually exchange matter with the intergalactic medium via inflows and outflows has been dubbed the “baryon cycle”. The topic of this book is directly related to the baryon cycle, in particular its least well constrained aspect, namely gas accretion. Accretion is a rare area of astrophysics in which the basic theoretical predictions are established, but the observations have been as yet unable to verify the expectations. Accretion has long been seen around the Milky Way in so-called High Velocity Clouds, but detecting accretion even around nearby galaxies has proved challenging; its multi-phase nature requires sensitive observations across the electromagnetic spectrum for full characterization. A promising approach involves looking for kinematic signatures, but accretion signatures are often confused with internal motions within galaxies. Accretion studies therefore touch a wide range of astrophysical processes, and hence a wide cross-section of the astronomical community. As observational facilities are finally able to access the wavelength ranges and depths at which accretion processes may be manifest, the time is right to survey these multiple lines of investigation and determine the state of the field in accretion studies of the baryon cycle.

Author : Siegfried Röser
Publisher : John Wiley & Sons
Page : 269 pages
File Size : 47,6 Mb
Release : 2006-12-13
Category : Science
ISBN : 9783527609123

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From Cosmological Structures to the Milky Way by Siegfried Röser Pdf

Volume 18 continues the Reviews in Modern Astronomy with twelve invited reviews and highlight contributions which were presented during the International Scientific Conference of the Astronomical Society on the topic "From Cosmological Structures to the Milky Way", held in Prague, Czech Republic, September 20 to 25, 2004. The contributions to the meeting published in this volume discuss, among other subjects, X-ray astronomy, cosmology, star formation and the Galactic Centre.