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The Accretion and Obscured Growth of Supermassive Black Holes

2020-12-02 Science
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Release : 2020-12-02
Genre : Science
Kind : eBook
Book Rating : 61X/5 ( reviews)

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Book Synopsis The Accretion and Obscured Growth of Supermassive Black Holes by : Peter Boorman

Download or read book The Accretion and Obscured Growth of Supermassive Black Holes written by Peter Boorman. This book was released on 2020-12-02. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the application of state-of-the-art high-energy X-ray studies to the astronomical quest for understanding obscured active galactic nuclei (AGN). These AGN are supermassive black holes growing by accretion of matter located in the nuclei of galaxies. The material that feeds these black holes also obscures them from view, rendering them challenging to study. It is possible to study them by effectively 'X-raying' galactic nuclei to peer through these obscuring veils. Beginning with the proof-of-concept application of novel X-ray Monte Carlo codes to the Nuclear Spectroscopic Telescope ARray (NuSTAR) spectrum of a known heavily obscured AGN, the thesis establishes the relevant parameters that characterise the AGN spectrum and central black hole growth rate. Next the largest sample of known heavily obscured AGN is compiled, finding the strength of a prominent iron spectral feature to weaken with AGN power. This is puzzling, and suggests that there may be more hidden AGN than previously thought. Finally by combining an all-sky infrared selection with NuSTAR follow-up, new heavily obscured AGN are identified. Obscuration emits infrared radiation, meaning that the infrared-selected AGN catalogue should be representative of the underlying AGN population. The absence of such representative catalogues has continually plagued cosmological studies, and the resultant obscured AGN fraction will be strongly constraining for AGN models.

Growing Black Holes: Accretion in a Cosmological Context

2005-04-25 Science
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Release : 2005-04-25
Genre : Science
Kind : eBook
Book Rating : 757/5 ( reviews)

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Book Synopsis Growing Black Holes: Accretion in a Cosmological Context by : Andrea Merloni

Download or read book Growing Black Holes: Accretion in a Cosmological Context written by Andrea Merloni. This book was released on 2005-04-25. Available in PDF, EPUB and Kindle. Book excerpt: Supermassive black holes are now believed to play an important role in the evolution of the Universe. Every respectable galaxy hosts in its center a black hole that appears to regulate the growth of the galaxy itself. In this book, leading experts in the field review the most recent theoretical and observational results on the following topics: - formation and growth of the first black holes in the Universe and their role in the formation and evolution of galaxies - the physics of black-hole accretion and the production of relativistic jets - binary black-hole mergers and gravitational radiation. Theoretical work is supplemented by the most recent exciting results from space and ground based observatories. This volume is useful research and reference tool for the entire astrophysical community.

The Physics of Accretion onto Black Holes

2014-10-28 Science
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Release : 2014-10-28
Genre : Science
Kind : eBook
Book Rating : 270/5 ( reviews)

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Book Synopsis The Physics of Accretion onto Black Holes by : Maurizio Falanga

Download or read book The Physics of Accretion onto Black Holes written by Maurizio Falanga. This book was released on 2014-10-28. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Growing Black Holes: Accretion in a Cosmological Context

2009-09-02 Science
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Release : 2009-09-02
Genre : Science
Kind : eBook
Book Rating : 831/5 ( reviews)

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Book Synopsis Growing Black Holes: Accretion in a Cosmological Context by : Andrea Merloni

Download or read book Growing Black Holes: Accretion in a Cosmological Context written by Andrea Merloni. This book was released on 2009-09-02. Available in PDF, EPUB and Kindle. Book excerpt: Supermassive black holes are now believed to play an important role in the evolution of the Universe. Every respectable galaxy hosts in its center a black hole that appears to regulate the growth of the galaxy itself. In this book, leading experts in the field review the most recent theoretical and observational results on the following topics: - formation and growth of the first black holes in the Universe and their role in the formation and evolution of galaxies - the physics of black-hole accretion and the production of relativistic jets - binary black-hole mergers and gravitational radiation. Theoretical work is supplemented by the most recent exciting results from space and ground based observatories. This volume is useful research and reference tool for the entire astrophysical community.

Supermassive Black Holes in the Distant Universe

2013-11-09 Science
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Release : 2013-11-09
Genre : Science
Kind : eBook
Book Rating : 711/5 ( reviews)

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Book Synopsis Supermassive Black Holes in the Distant Universe by : A.J. Barger

Download or read book Supermassive Black Holes in the Distant Universe written by A.J. Barger. This book was released on 2013-11-09. Available in PDF, EPUB and Kindle. Book excerpt: Quasars, and the menagerie of other galaxies with "unusual nuclei", now collectively known as Active Galactic Nuclei or AGN, have, in one form or another, sparked the interest of astronomers for over 60 years. The only known mechanism that can explain the staggering amounts of energy emitted by the innermost regions of these systems is gravitational energy release by matter falling towards a supermassive black hole --- a black hole whose mass is millions to billions of times the mass of our Sun. AGN emit radiation at all wavelengths. X-rays originating at a distance of a few times the event horizon of the black hole are the emissions closest to the black hole that we can detect; thus, X-rays directly reveal the presence of active supermassive black holes. Oftentimes, however, the supermassive black holes that lie at the centers of AGN are cocooned in gas and dust that absorb the emitted low energy X-rays and the optical and ultraviolet light, hiding the black hole from view at these wavelengths. Until recently, this low-energy absorption presented a major obstacle in observational efforts to map the accretion history of the universe. In 1999 and 2000, the launches of the Chandra and XMM-Newton X-ray Observatories finally broke the impasse. The impact of these observatories on X-ray astronomy is similar to the impact that the Hubble Space Telescope had on optical astronomy. The astounding new data from these observatories have enabled astronomers to make enormous advances in their understanding of when accretion occurs.

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