Hard X Ray Emission From Galactic Black Hole Candidates
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Hard X Ray Emission From Galactic Black Hole Candidates
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Author : Patrick Lee Nolan
language : en
Publisher:
Release Date : 1982
Hard X Ray Emission From Galactic Black Hole Candidates written by Patrick Lee Nolan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Black holes (Astronomy) categories.
Galactic Black Hole Binaries High Energy Radiation
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Author :
language : en
Publisher:
Release Date : 1997
Galactic Black Hole Binaries High Energy Radiation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Observations of galactic black hole candidates made by the instruments aboard the Compton GRO in the hard X-ray and gamma-ray bands have significantly enhanced our knowledge of the emission properties of these objects. Understanding these observations presents a formidable challenge to theoretical models of the accretion flow onto the compact object and of the physical mechanisms that generate high-energy radiation. Here we summarize the current state of observations and theoretical interpretation of the emission from black hole candidates above 20 keV. The all-sky monitoring capability of BATSE allows, for the first time, nearly continuous studies of the high-energy emission from more than a dozen black hole candidates. These long-term datasets are particularly well-suited to multi- wavelength comparison studies, from the radio upward in frequency (Zhang et al. 1997a, these proceedings). Energy spectral evolution and/or spectral state transitions have been observed from many of the black hole candidates. Moderately deep searches of the galactic plane suggest a deficit of weak gamma-ray transients. Such population studies have implications for the origin of black hole binaries and the nature of accretion events.
From X Ray Binaries To Quasars Black Holes On All Mass Scales
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Author : Thomas J. Maccarone
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-01-28
From X Ray Binaries To Quasars Black Holes On All Mass Scales written by Thomas J. Maccarone 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 2007-01-28 with Science categories.
This volume brings together contributions from many of the world's leading authorities on black hole accretion. The papers within represent part of a new movement to make use of the relative advantages of studying stellar mass and supermassive black holes, and to bring together the knowledge gained from the two approaches. The topics discussed include black hole observational and theoretical work-variability, spectroscopy, disk-jet connections, and multi-wavelength campaigns on black holes.
Long Term Optical And X Ray Monitoring Of Black Hole Candidates In Extragalactic Globular Clusters
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Author : Kristen C. Dage
language : en
Publisher:
Release Date : 2020
Long Term Optical And X Ray Monitoring Of Black Hole Candidates In Extragalactic Globular Clusters written by Kristen C. Dage and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Electronic dissertations categories.
The question of whether globular clusters (GCs) host black holes (BHs) has been a long-standing question in astronomy. Because of the dynamics of the crowded globular cluster environment, they should be extremely efficient at forming black hole-black hole binaries (BBHs), such as those detected merging by LIGO. LIGO is detecting many more (and more massive!) BBHs than was ever expected, and a first step to understanding the formation of these binaries is to understand BHs in GCs. However, very few ways exist to study BHs in GCs observationally, and there is only one effective method to study BH candidates in extragalactic GCs: by studying ultraluminous X-ray sources (ULXs) that are associated with GCs. Because their X-ray luminosities far exceed the Eddington limit for a stellar mass BH, ULXs in GCs are good BH candidates. However, they are very rare, with only a few per galaxy (with only 10 currently known sources among 3 galaxies). In this thesis, we study a total of 9 ULX sources that are associated with globular clusters in both X-ray and optical. One of these, RZ2109, shows extreme variability across more than 15 years of monitoring in X-ray, with changes of almost an order of magnitude on the order of days. Typically any variability in flux is expected to be correlated with a change in the spectral properties of the source (i.e. some physical change in the system), however, the shape of the X-ray spectrum of RZ2109 remains the same across all observations. X-ray and optical studies of all 9 GC ULXs indicate a potential correlation between the X-ray spectrum and presence of optical emission beyond the cluster continuum--one of the few X-ray-optical correlations known for astronomical objects. Lastly, we present long-term monitoring in optical of RZ2109 shows a broad [OIII] emission line which declines long-term over almost ten years, and then re-brightens.
X Ray Timing And Spectral Observations Of Galactic Black Hole Candidate Xte J1550 564 During Outburst
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Author : Kaice Theodore Reilly
language : en
Publisher:
Release Date : 2002
X Ray Timing And Spectral Observations Of Galactic Black Hole Candidate Xte J1550 564 During Outburst written by Kaice Theodore Reilly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Grenz rays categories.
Black Holes In Binaries And Galactic Nuclei Diagnostics Demography And Formation
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Author : Riccardo Giacconi
language : en
Publisher: Springer Science & Business Media
Release Date : 2001-02-26
Black Holes In Binaries And Galactic Nuclei Diagnostics Demography And Formation written by Riccardo Giacconi 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 2001-02-26 with Science categories.
The observational evidence for the existence of black holes has grown significantly over recent decades. Stellar-mass black holes are detected as X-ray sources in binary systems, while supermassive black holes, with masses more than a million times the mass of the Sun, lurk in the nuclei of galaxies. These proceedings provide a useful and up-to-date overview of the observations of black holes in binaries, in the center of the Milky Way, and in the nuclei of galaxies, presented by leading expert astronomers. Special attention is given to the formation (including the recent evidence from gamma-ray bursts), physical properties, and demographics of black holes.
Observational Evidence For Black Holes In The Universe
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Author : Sandip K. Chakrabarti
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Observational Evidence For Black Holes In The Universe written by Sandip K. Chakrabarti 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 2012-12-06 with Science categories.
A conference on `Observational Evidence for Black Holes in the Universe' was held in Calcutta during January 10-17, 1998. This was the first time that experts had gathered to debate and discuss topics such as: Should black holes exist? If so, how to detect them? Have we found them? This book is the essence of this gathering. Black holes are enigmatic objects since it is impossible to locate them through direct observations. State-of-the-art theoretical works and numerical simulations have given us enough clues of what to look for. Observations, from both ground and space-based missions, have been able to find these tell-tale signatures. This book is a compendium of our present knowledge about these theories and observations. Combined, they give a thorough idea of whether black holes, galactic as well as extragalactic, have been detected or not. Forty-one experts of the subject have contributed to this volume to make it the most comprehensive to date.
Radiation From Black Holes Future Missions To Primitive Bodies And Middle Atmospheric Fine Structures
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Author : COSPAR. Scientific Assembly
language : en
Publisher: Elsevier
Release Date : 1997-04-02
Radiation From Black Holes Future Missions To Primitive Bodies And Middle Atmospheric Fine Structures written by COSPAR. Scientific Assembly and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-04-02 with Science categories.
The majority of this volume is devoted to the subject of high energy radiation from galactic and extragalactic black holes. The volume also covers future space missions to primitive bodies and fine structures in the middle atmosphere and their origin. In total, 27 papers are presented, the final two included in the appendix emanating from the previous COSPAR meeting in Washington.
Fast Spectral Variability In The X Ray Emission Of Accreting Black Holes
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Author : Chris Skipper
language : en
Publisher:
Release Date : 2014-09-30
Fast Spectral Variability In The X Ray Emission Of Accreting Black Holes written by Chris Skipper and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-09-30 with categories.
Allen S Astrophysical Quantities
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Author : Arthur N. Cox
language : en
Publisher: Springer
Release Date : 2015-03-19
Allen S Astrophysical Quantities written by Arthur N. Cox and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-19 with Science categories.
This new, fourth, edition of Allen's classic Astrophysical Quantities belongs on every astronomer's bookshelf. It has been thoroughly revised and brought up to date by a team of more than ninety internationally renowned astronomers and astrophysicists. While it follows the basic format of the original, this indispensable reference has grown to more than twice the size of the earlier editions to accommodate the great strides made in astronomy and astrophysics. It includes detailed tables of the most recent data on: - General constants and units - Atoms, molecules, and spectra - Observational astronomy at all wavelengths from radio to gamma-rays, and neutrinos - Planetary astronomy: Earth, planets and satellites, and solar system small bodies - The Sun, normal stars, and stars with special characteristics - Stellar populations - Cataclysmic and symbiotic variables, supernovae - Theoretical stellar evolution - Circumstellar and interstellar material - Star clusters, galaxies, quasars, and active galactic nuclei - Clusters and groups of galaxies - Cosmology. As well as much explanatory material and extensive and up-to-date bibliographies.