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Millimeter and Submillimeter Studies on the Active Trinity of Gas, Stars, and Black Holes in Seyfert Galaxies

2018-01-23 Science
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Release : 2018-01-23
Genre : Science
Kind : eBook
Book Rating : 102/5 ( reviews)

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Book Synopsis Millimeter and Submillimeter Studies on the Active Trinity of Gas, Stars, and Black Holes in Seyfert Galaxies by : Takuma Izumi

Download or read book Millimeter and Submillimeter Studies on the Active Trinity of Gas, Stars, and Black Holes in Seyfert Galaxies written by Takuma Izumi. This book was released on 2018-01-23. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on understanding the growth and formation mechanism of supermassive black holes (SMBHs), an issue it addresses by investigating the dense interstellar medium that is assumed to be a crucial component of the fuel for SMBHs. The thesis also offers unique guidance on using the Atacama Large Millimeter/submillimeter Array (ALMA) in active galactic nuclei (AGN) research. The author presents the three major findings regarding SMBH formation and growth: (1) The development of a new diagnostic method for the energy sources in galaxies based on submillimeter spectroscopy, which allows identification of accreting SMBHs even in obscured environments, (2) the discovery that the circumnuclear dense gas disk (CND), with a typical size of a few tens of parsecs, which plays a crucial role in governing the growth of SMBHs, and (3) the discovery that the mass transfer budget from the CND to the central SMBHs can be quantitatively understood with a theoretical model incorporating the circumnuclear starburst as a driver of mass transfer. The thesis skillfully reviews these three findings, which have greatly improved our understanding of the growth mechanism of SMBHs.

Supermassive Black Holes

1988-02-18 Science
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Release : 1988-02-18
Genre : Science
Kind : eBook
Book Rating : 469/5 ( reviews)

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Book Synopsis Supermassive Black Holes by : Minas Kafatos

Download or read book Supermassive Black Holes written by Minas Kafatos. This book was released on 1988-02-18. Available in PDF, EPUB and Kindle. Book excerpt:

Aspects of Supermassive Black Hole Growth in Nearby Active Galactic Nuclei

2015 Active galactic nuclei
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Release : 2015
Genre : Active galactic nuclei
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Book Synopsis Aspects of Supermassive Black Hole Growth in Nearby Active Galactic Nuclei by : Davide Lena

Download or read book Aspects of Supermassive Black Hole Growth in Nearby Active Galactic Nuclei written by Davide Lena. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: "Super-massive black holes (SBHs) have long been identified as the engines of active galactic nuclei (AGNs) and are now considered to play a key role in galaxy evolution. In this dissertation I present results from two observational studies conducted on nearby AGNs with the aim of furthering our understanding of SBH growth and their interplay with the host galaxies. The first study is an observational search for SBHs spatially offset from the center of their host galaxies. Such offsets can be considered signatures of gravitational recoil following the coalescence of an SBH binary system (formed in the aftermath of a galaxy merger) due to emission of gravitational waves. The study is based on a photometric analysis of fourteen nearby elliptical galaxies observed with the Hubble Space Telescope. I find that parsec-scale offsets are common. However, while these are individually consistent with residual gravitational recoil oscillations, there is a high probability that larger offsets than those actually observed should have been found in the sample as a whole. There are a number of possible explanations for this result: the galaxy merger rate may be lower than current estimates; SBH-binaries may reach the merger stage with a configuration which minimizes recoil velocities; or the SBH oscillations are more quickly damped than predicted. In the second study I use integral field spectroscopy obtained with the Gemini South telescope to investigate the kinematics of the circum-nuclear ionized gas in two active galaxies: NGC 1386, a Seyfert 2, and NGC 1365, a Seyfert 1. The goal of the study is to investigate outflows in low-luminosity AGNs, and the mechanisms channeling gas (the SBH fuel) from the inner kiloparsec down to a few tens of parsecs from the SBH. I find that the dominant kinematic components can be explained as a combination of rotation in the large-scale galactic disk and compact outflows along the axis of the AGN 'radiation cone'. However, in the case of NGC 1386, there is also compelling evidence for an equatorial outflow, which provides a new clue to the physical processes operating in AGNs."--Abstract.

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.

From X-ray Binaries to Quasars: Black Holes on All Mass Scales

2007-01-28 Science
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Release : 2007-01-28
Genre : Science
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Book Rating : 857/5 ( reviews)

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Book Synopsis From X-ray Binaries to Quasars: Black Holes on All Mass Scales by : Thomas J. Maccarone

Download or read book From X-ray Binaries to Quasars: Black Holes on All Mass Scales written by Thomas J. Maccarone. This book was released on 2007-01-28. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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