Cooling Flows In Clusters Of Galaxies
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Cooling Flows In Clusters And Galaxies
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Author : A.C. Fabian
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Cooling Flows In Clusters And Galaxies written by A.C. Fabian 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.
X-ray astronomers discovered the diffuse gas in clusters of galaxies about 20 years ago. It was later realized that the central gas density in some clusters, and in elliptical galaxies, is so high that radiative cooling is a significant energy loss. The cooling time of the gas decreases rapidly towards the centre of the cluster or galaxy and is less than a Hubble time within the innermost few hundred kiloparsecs. This results in a cooling flow in which the gas density rises in order to maintain pressure to support the weight of the overlying gas. The rate at which mass is deposited by the flow is inferred to be several hundreds of solar masses per year in some clusters. The fraction of clusters in which cooling flows are found may exceed 50 per cent. Small flows probably occur in most normal elliptical galaxies that are not in rich clusters. The implications of this simple phenomenon are profound, for we appear to be witnessing the ongoing formation of the central galaxy. In particular, since most of the gas is undetected once it cools below about 3 million K, it appears to form dark matter. There is no reason why it should be detectable with current techniques if each cooling proton only recombines once and the matter condenses into objects of low mass.
Clusters Of Galaxies Volume 3 Carnegie Observatories Astrophysics Series
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Author : John S. Mulchaey
language : en
Publisher: Cambridge University Press
Release Date : 2004-09-23
Clusters Of Galaxies Volume 3 Carnegie Observatories Astrophysics Series written by John S. Mulchaey 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 2004-09-23 with Science categories.
Clusters of galaxies are the largest and most massive collapsed systems in the Universe, and as such they are valuable probes of cosmological structure and galaxy evolution. The advent of extensive galaxy surveys, large ground-based facilities, space-based missions such as HST, Chandra and XMM-Newton and detailed numerical simulations makes a particularly exciting time to be involved in this field. The review papers in this volume span a comprehensive range of research in this area, including theoretical expectations for the growth of structure, survey techniques to identify clusters, metal production and the intracluster medium, galaxy evolution in the cluster environment and group-cluster connections. With contributions from leading authorities in the field, this volume is appropriate both as an introduction to this topic for physics and astronomy graduate students, and as a reference source for professional research astronomers.
Cooling Flows In Clusters And Galaxies
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Author : A C Fabian
language : en
Publisher:
Release Date : 1988-05-31
Cooling Flows In Clusters And Galaxies written by A C Fabian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-05-31 with categories.
Cooling Flows In Clusters Of Galaxies
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Author : Avery Abraham Meiksin
language : en
Publisher:
Release Date : 1988
Cooling Flows In Clusters Of Galaxies written by Avery Abraham Meiksin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Galaxies categories.
Cooling Flows In Clusters And Galaxies
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Author : A.C. Fabian
language : en
Publisher: Springer
Release Date : 1988-05-31
Cooling Flows In Clusters And Galaxies written by A.C. Fabian and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-05-31 with Science categories.
X-ray astronomers discovered the diffuse gas in clusters of galaxies about 20 years ago. It was later realized that the central gas density in some clusters, and in elliptical galaxies, is so high that radiative cooling is a significant energy loss. The cooling time of the gas decreases rapidly towards the centre of the cluster or galaxy and is less than a Hubble time within the innermost few hundred kiloparsecs. This results in a cooling flow in which the gas density rises in order to maintain pressure to support the weight of the overlying gas. The rate at which mass is deposited by the flow is inferred to be several hundreds of solar masses per year in some clusters. The fraction of clusters in which cooling flows are found may exceed 50 per cent. Small flows probably occur in most normal elliptical galaxies that are not in rich clusters. The implications of this simple phenomenon are profound, for we appear to be witnessing the ongoing formation of the central galaxy. In particular, since most of the gas is undetected once it cools below about 3 million K, it appears to form dark matter. There is no reason why it should be detectable with current techniques if each cooling proton only recombines once and the matter condenses into objects of low mass.
Cosmological Aspects Of X Ray Clusters Of Galaxies
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Author : W.C. Seitter
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Cosmological Aspects Of X Ray Clusters Of Galaxies written by W.C. Seitter 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.
The NATO Advanced Study Institute "Cosmological Aspects of X-Ray Clus ters of Galaxies" took place in Vel en , Westphalia, Germany, from June 6 to June 18, 1993. It addressed the fruitful union of two topics, cosmology and X-ray clus ters, both of which carry substantial scientific weight at the beginning of the last decenium of the last century in the second millenium of our era. The so far largest X-ray "All-Sky Survey", observed by the ROSAT X-ray satel lite, and ROSAT's deep pointed observations, have considerably enlarged the base of X-ray astronomy, particularly concerning extragalactic sources. Cosmology has gained significant impetus from the large optical direct and spectroscopic surveys, based on high quality 2-dimensional receivers at large telescopes and powerful scan ning devices, harvesting the full information 1 content from the older technique of employing photographic plates. Radioastronomy and IR-astronomy with IRAS, as well as r-astronomy with GRO, continue and strengthen the role of extragalactic research. The rapidly growing computer power in data reduction and data storage facilities support the evolution towards large-number statistics. A most significant push was given to early cosmology by the needs of physics in trying to unravel the nature of forces which govern our material world. The topic of the ASI was chosen because it opens new vistas on this for ever new problem: the universe. Clusters of galaxies probe large-scale matter distributions and the structure of space-time.
Heating Versus Cooling In Galaxies And Clusters Of Galaxies
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Author : Hans Böhringer
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-09-27
Heating Versus Cooling In Galaxies And Clusters Of Galaxies written by Hans Böhringer 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 2007-09-27 with Science categories.
The Universe would be a dull and dark place if the gaseous baryons did not cool, collapse, and form stars and galaxies. However, if this gas is allowed to cool unimpeded at the rate predicted from known atomic physics, in the context of a well-established cosmological model, the gaseous matter would form stars and galaxies with a high e?ciency, so that far more than the observed fraction of about 10–15% of the baryonic matter would be found in luminous stellar systems. Therefore,cooling must be damped or regulatedby heating processes, and observations show that this ‘feedback’ is a widespread astrophysical phenomenon. The place where this cooling and feedback manifests itself most dram- ically is in the inner regions of the most massive Dark Matter halos found in our Universe, in the cores of galaxy clusters. The e?ect of cosmic co- ing in these objects was recognized in the mid-1970s, and the term ‘cooling ?ow’ was introduced by Andy Fabian and colleagues at Cambridge as a p- sible explanation of the physical processes obtained in the central regions of clusters. The name refers to the fact that gas cooling in the inner regions is associated with a loss of central pressure, causing an in?ow of hot gas from larger radii.
A Pan Chromatic View Of Clusters Of Galaxies And The Large Scale Structure
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Author : Manolis Plionis
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-02-29
A Pan Chromatic View Of Clusters Of Galaxies And The Large Scale Structure written by Manolis Plionis 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 2008-02-29 with Science categories.
The reviews presented in this volume cover a huge range of cluster of galaxies topics. Readers will find the book essential reading on subjects such as the physics of the ICM gas, the internal cluster dynamics, and the detection of clusters using different observational techniques. The expert chapter authors also cover the huge advances being made in analytical or numerical modeling of clusters, weak and strong lensing effects, and the large scale structure as traced by clusters.
The Environment And Evolution Of Galaxies
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Author : J.M. Shull
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
The Environment And Evolution Of Galaxies written by J.M. Shull 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.
In July 1992, over 300 astronomers attended the Third Tetons Summer School on the subject of `The Environment and Evolution of Galaxies'. This book presents 28 papers based on invited review talks and a panel discussion on `The Nature of High Redshift Objects'. The major themes include: the Interstellar and Intergalactic Medium, Galaxy Formation and Evolution, Cooling Flows, Quasars and Radiation Backgrounds, and Interactions between Galaxies/AGNs and their Environment. Recent advances with the ROSAT, COBE and Hubble Space Telescope are discussed, together with current theoretical developments. The tutorial nature of the papers make this book a valuable supplement for professional astonomers, graduate students, and senior undergraduates. As with previous Tetons conferences, this book provides both the current state of observational and theoretical research and material complementary to courses in extragalactic and interstellar astrophysics.
The Simulation Of Cooling Flows In Clusters Of Galaxies
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Author : Nasser Mohamed Ahmed Mohamed Ismail
language : en
Publisher:
Release Date : 2007
The Simulation Of Cooling Flows In Clusters Of Galaxies written by Nasser Mohamed Ahmed Mohamed Ismail and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Cooling categories.