Millimeter And Submillimeter Studies On The Active Trinity Of Gas Stars And Black Holes In Seyfert Galaxies
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Millimeter And Submillimeter Studies On The Active Trinity Of Gas Stars And Black Holes In Seyfert Galaxies
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Author : Takuma Izumi
language : en
Publisher: Springer
Release Date : 2018-01-23
Millimeter And Submillimeter Studies On The Active Trinity Of Gas Stars And Black Holes In Seyfert Galaxies written by Takuma Izumi and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-23 with Science categories.
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.
Black Holes Iau S238
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Author : International Astronomical Union. Symposium
language : en
Publisher: Cambridge University Press
Release Date : 2007-07-30
Black Holes Iau S238 written by International Astronomical Union. Symposium 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 2007-07-30 with Science categories.
IAU S238 report on the physics of black holes, by leading researchers in the field.
The Nearest Active Galaxies
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Author : J. E. Beckman
language : en
Publisher: Editorial CSIC - CSIC Press
Release Date : 1993
The Nearest Active Galaxies written by J. E. Beckman and has been published by Editorial CSIC - CSIC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Active galaxies categories.
Fast Spectral Variability In The X Ray Emission Of Accreting Black Holes
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Author : Chris Skipper
language : en
Publisher: Springer
Release Date : 2014-09-04
Fast Spectral Variability In The X Ray Emission Of Accreting Black Holes written by Chris Skipper and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-09-04 with Science categories.
This thesis brings together the various techniques of X-ray spectral analysis in order to examine the properties of black holes that vary in mass by several orders of magnitude. In all these systems it is widely accepted that the X-ray emission is produced by Compton up-scattering of lower energy seed photons in a hot corona or accretion flow, and here these processes are examined through a study of the X-ray spectral variability of each source. A new technique is introduced, in which models are fitted to over 2 million X-ray spectra on time-scales as short as 16 ms, and subsequently it is shown that the nature of the correlation between intensity and spectral index is strongly dependent upon the spectral state of the black hole. Finally, the results of an extensive survey of nearby galactic nuclei using the Chandra X-ray telescope are presented in the form of images and spectra, and these results are used along with data from the literature to search for Compton-thick nuclei.
Molecular Gas In Seyfert Galaxies
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Author : Stephen J. Curran
language : en
Publisher:
Release Date : 2000
Molecular Gas In Seyfert Galaxies written by Stephen J. Curran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Interstellar matter categories.
The Complex Broad Band X Ray Spectra Of Seyfert Galaxies
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Author : Kimberly Weaver
language : en
Publisher:
Release Date : 1993
The Complex Broad Band X Ray Spectra Of Seyfert Galaxies written by Kimberly Weaver and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Astronomical spectroscopy categories.
Quasars At All Cosmic Epochs
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Author :
language : en
Publisher:
Release Date : 2018
Quasars At All Cosmic Epochs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
The last 50 years have seen a tremendous progress in the research on quasars. From a time when quasars were unforeseen oddities, we have come to a view that considers quasars as active galactic nuclei, with nuclear activity a coming-of-age experienced by most or all galaxies in their evolution. We have passed from a few tens of known quasars of the early 1970s to the 500,000 listed in the catalogue of the Data Release 14 of the Sloan Digital Sky Survey. Not surprisingly, accretion processes on the central black holes in the nuclei of galaxies -- the key concept in our understanding of quasars and active nuclei in general -- have gained an outstanding status in present-day astrophysics. Accretion produces a rich spectrum of phenomena in all bands of the electromagnetic spectrum. The power output of highly-accreting quasars has impressive effects on their host galaxies. All the improvement in telescope light gathering and in computing power notwithstanding, we still miss a clear connection between observational properties and theory for quasars, as provided, for example, by the H-R diagram for stars. We do not yet have a complete self-consistent view of nuclear activity with predictive power, as we do for main-sequence stellar sources. At the same time quasars offer many "windows open onto the unknown". On small scales, quasar properties depend on phenomena very close to the black hole event horizon. On large scales, quasars may effect evolution of host galaxies and their circum-galactic environments. Quasars' potential to map the matter density of the Universe and help reconstruct the Universe's spacetime geometry is still largely unexploited. The times are ripe for a critical assessment of our present knowledge of quasars as accreting black holes and of their evolution across the cosmic time. The foremost aim of this research topic is to review and contextualize the main observational scenarios following an empirical approach, to present and discuss the accretion scenario, and then to analyze how a closer connection between theory and observation can be achieved, identifying those aspects of our understanding that are still on a shaky terrain and are therefore uncertain knowledge. This research topic covers topics ranging from the nearest environment of the black hole, to the environment of the host galaxies of active nuclei, and to the quasars as markers of the large scale structure and of the geometry of spacetime of the Universe. The spatial domains encompass the accretion disk, the emission and absorption regions, circum-nuclear starbursts, the host galaxy and its interaction with other galaxies. Systematic attention is devoted to some key problems that remain outstanding and are clearly not yet solved: the existence of two quasar classes, radio quiet and radio loud, and in general, the systematic contextualization of quasar properties the properties of the central black hole, the dynamics of the accretion flow in the inner parsecs and the origin of the accretion matter, the quasars' small and large scale environment, the feedback processes produced by the black hole into the host galaxy, quasar evolutionary patterns from seed black holes to the present-day Universe, and the use of quasars as cosmological standard candles. The timing is appropriate as we are now witnessing a growing body of results from major surveys in the optical, UV X, near and far IR, and radio spectral domains. Radio instrumentation has been upgraded to linear detector -- a change that resembles the introduction of CCDs for optical astronomy -- making it possible to study radio-quiet quasars at radio frequencies. Herschel and ALMA are especially suited to study the circum-nuclear star formation processes. The new generation of 3D magnetohydrodynamical models offers the prospective of a full physical modeling of the whole quasar emitting regions. At the same time, on the forefront of optical astronomy, applications of adaptive optics to long-slit spectroscopy is yielding unprecedented results on high redshift quasars. Other measurement techniques like 2D and photometric reverberation mapping are also yielding an unprecedented amount of data thanks to dedicated experiments and instruments. Thanks to the instrumental advances, ever growing computing power as well as the coming of age of statistical and analysis techniques, the smallest spatial scales are being probed at unprecedented resolution for wide samples of quasars. On large scales, feedback processes are going out of the realm of single-object studies and are entering into the domain of issues involving efficiency and prevalence over a broad range of cosmic epochs. The Research Topic "Quasars at all Cosmic Epochs" collects a large fraction of the contributions presented at a meeting held in Padova, sponsored jointly by the National Institute for Astrophysics, the Padova Astronomical Observatory, the Department of Physics and Astronomy of the University of Padova, and the Instito de Astrofísica de Andalucía (IAA) of the Consejo Superiór de Investigación Cientifica (CSIC). The meeting has been part of the events meant to celebrate the 250th anniversary of the foundation of the Padova Observatory.
Active Galactic Nuclei
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Author : Françoise Combes
language : en
Publisher:
Release Date : 2021
Active Galactic Nuclei written by Françoise Combes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Active galactic nuclei categories.
Almost all galaxies host in their center a supermassive black hole of mass between a million and tens of billions solar masses. Supermassive black holes grow in symbiosis with their host galaxies across the Hubble time, occasionally accreting surround matter, giving rise to an Active Galactic Nuclei (AGN). This book gives a general review of our current knowledge of AGN, powered by supermassive black holes: how they are fueled by gas (or stars) and what problems are encountered; how can we account for the wide variety of AGN, from Seyfert/Liners to quasars, and for the two types (AGN 1 and 2) either through dust obscuration, and geometrical orientation arguments, or through intrinsic activity difference, qualitative or quantitative.
Deep Millimeter Surveys
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Author : James D. Lowenthal
language : en
Publisher: World Scientific
Release Date : 2001
Deep Millimeter Surveys written by James D. Lowenthal and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Science categories.
The arrival of large submillimeter and millimeter-wave detector arrays opened a new window on galaxy formation and evolution. The major new facilities now being designed or constructed, such as ALMA (MMA) and the Large Millimeter Telescope (LMT), will soon be expanding the horizons even farther.The Conference on ?Deep Millimeter Surveys: Implications for Galaxy Formation and Evolution? drew together the major international groups working on submillimeter and millimeter-wave galaxies to discuss their relation to other galaxies both near by and in the early Universe, the role of the LMT and other new facilities in advancing the new field, and the implications of the new results and models for our understanding of galaxy formation and evolution. The resulting compendium of reports on observations, simulations, theory and interpretation, and instrumentation is the first book to present the new millimeter view of the early Universe thoroughly in a single volume.
The Neutron Star
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Author : Chryssa Kouveliotou
language : en
Publisher: Springer Science & Business Media
Release Date : 2001-12-31
The Neutron Star written by Chryssa Kouveliotou 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 2001-12-31 with Science categories.
Proceedings of the NATO Advanced Study Institute, Elounda, Crete, Greece, 7-18 June 1999