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Author : Ajit K. Kembhavi,Jayant V. Narlikar
Publisher : Cambridge University Press
Page : 488 pages
File Size : 47,5 Mb
Release : 1999-03-11
Category : Science
ISBN : 0521479894
The latest observations and theoretical models are combined in this clear, pedagogic textbook for advanced undergraduates and graduate students.
Author : Halton C. Arp
Publisher : Cambridge University Press
Page : 220 pages
File Size : 48,5 Mb
Release : 1988-09-29
Category : Science
ISBN : 0521363144
Contests the 'establishment' view of quasars as the most distant objects in the universe.
Author : Paola Marziani,Mauro D'Onofrio,Ascensión del Olmo,Deborah Dultzin
Publisher : Frontiers Media SA
Page : 447 pages
File Size : 52,5 Mb
Release : 2018-10-05
Category : Electronic
ISBN : 9782889456048
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.
Author : Mauro D'Onofrio,Paola Marziani,Jack W. Sulentic
Publisher : Springer Science & Business Media
Page : 613 pages
File Size : 42,9 Mb
Release : 2012-09-14
Category : Science
ISBN : 9783642275647
The 50th anniversary of the discovery of quasars in 1963 presents an interesting opportunity to ask questions about the current state of quasar research. Formatted as a series of interviews with noted researchers in the field, each of them asked to address a specific set of questions covering topics selected by the editors, this book deals with the historical development of quasar research and discusses how advances in instrumentation and computational capabilities have benefitted quasar astronomy and have changed our basic understanding of quasars. In the last part of the book the interviews address the current topic of the role of quasars in galaxy evolution. They summarise open issues in understanding active galactic nuclei and quasars and present an outlook regarding what future observational facilities both on the ground and in space might reveal. Its interview format, the fascinating topic of quasars and black holes, and the lively recollections and at times controversial views of the contributors make this book both rewarding and a pleasure to read!
Author : Daniel W. Weedman
Publisher : Cambridge University Press
Page : 236 pages
File Size : 43,6 Mb
Release : 1988-04-14
Category : Science
ISBN : 0521356741
A current account of quasar astronomy that not only summarizes existing results from various techniques but refers to the potentialities of new instruments. All aspects of quasar spectroscopy are discussed and techniques for analyzing quasar data are summarized.
Author : David L. Clements,Ismael Perez-Fournon
Publisher : Springer Science & Business Media
Page : 348 pages
File Size : 48,6 Mb
Release : 2013-11-11
Category : Science
ISBN : 9783540696483
Author : Mauro D'Onofrio,Paola Marziani,Jack W. Sulentic
Publisher : Springer Science & Business Media
Page : 613 pages
File Size : 53,8 Mb
Release : 2012-06-30
Category : Science
ISBN : 9783642275630
Formatted as a series of interviews with noted researchers in the field, this book reviews the history of quasar research and describes how advances in instrumentation and computation have aided quasar astronomy and changed our basic understanding of quasars.
Author : Siegfried Böhme,Professor Dr. Walter Fricke,Inge Heinrich,Wilfried Hofmann,Dietlinde Krahn,Dorothea Rosa,Dr. Lutz D. Schmadel,Gert Zech
Publisher : Springer Science & Business Media
Page : 862 pages
File Size : 41,7 Mb
Release : 2013-11-11
Category : Science
ISBN : 9783662123287
Author : International Astronomical Union. Colloquium
Publisher : Cambridge University Press
Page : 540 pages
File Size : 53,9 Mb
Release : 2005-12
Category : Science
ISBN : 0521852056
Review of recent research in the field of quasar absorption line systems.
Author : Frederic Golden
Publisher : Unknown
Page : 196 pages
File Size : 47,8 Mb
Release : 1977-04
Category : Science
ISBN : 0671822969
Author : Karen Taschek
Publisher : UNM Press
Page : 92 pages
File Size : 54,7 Mb
Release : 2006
Category : Juvenile Nonfiction
ISBN : 0826332110
Introduces young readers to the wonders revealed by the Very Large Array (VLA) radio telescope on the plains of San Agustin, New Mexico.
Author : Siegfried Böhme,Professor Dr. Walter Fricke,Inge Heinrich,Wilfried Hofmann,Dietlinde Krahn,Dorothea Rosa,Dr. Lutz D. Schmadel,Gert Zech
Publisher : Springer Science & Business Media
Page : 851 pages
File Size : 41,9 Mb
Release : 2013-04-18
Category : Science
ISBN : 9783662123256
Author : Anonim
Publisher : Unknown
Page : 610 pages
File Size : 51,9 Mb
Release : 1976
Category : Nuclear energy
ISBN : UOM:39015026174170
Author : S. Böhme,Ute Esser,Professor Dr. Walter Fricke,U. Güntzel-Lingner,I. Heinrich,D. Krahn,Dr. Lutz D. Schmadel,G. Zech
Publisher : Springer Science & Business Media
Page : 869 pages
File Size : 48,6 Mb
Release : 2013-04-18
Category : Science
ISBN : 9783662123072
Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of literature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original literature and publication of the abstracts will not exceed eight months. This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. Volume 18 contains literature published in 1976 and received before March 1, 1977; some older liter ature which was received late and which is not recorded in earlier volumes is also included.
Author : Paul Wallace
Publisher : Fortress Press
Page : 146 pages
File Size : 42,8 Mb
Release : 2019-10-01
Category : Religion
ISBN : 9781506448442
Like many Americans, Paul Wallace grew up as a church-going Christian. Also like many, he lost his faith when he started taking science classes in college. He just didn't see how the rigorous method demanded by science could coexist with the belief in things unseen required by Christianity. But, as a working astrophysicist, he started to wonder if he'd gotten something wrong. Slowly and deliberately, he investigated the claims of Christianity, while also acknowledging that science, too, has limits. Ultimately, he came back to Christianity. In Love and Quasars, Wallace shows how faith and science are pitted against one another, and he explains how the standard ways of reconciling them don't work. He then proposes a reasonable, thoughtful approach that will appeal to Christians and students of science alike. Readable and wise, Love and Quasars is an indispensable resource for people who wonder if faith and science can coexist.
