Probing Galaxies Through Quasar Absorption Lines (IAU C199)

Probing Galaxies Through Quasar Absorption Lines (IAU C199)
Title Probing Galaxies Through Quasar Absorption Lines (IAU C199) PDF eBook
Author International Astronomical Union. Colloquium
Publisher Cambridge University Press
Total Pages 540
Release 2005-12
Genre Science
ISBN 9780521852050

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Review of recent research in the field of quasar absorption line systems.

Probing the Connection Between the Intergalactic Medium and Galaxies with Quasar Absorption-line Spectroscopy

Probing the Connection Between the Intergalactic Medium and Galaxies with Quasar Absorption-line Spectroscopy
Title Probing the Connection Between the Intergalactic Medium and Galaxies with Quasar Absorption-line Spectroscopy PDF eBook
Author Charles William Finn
Publisher
Total Pages
Release 2015
Genre
ISBN

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Proceedings of the Twenty Sixth General Assembly Prague 2006

Proceedings of the Twenty Sixth General Assembly Prague 2006
Title Proceedings of the Twenty Sixth General Assembly Prague 2006 PDF eBook
Author International Astronomical Union. General Assembly
Publisher Cambridge University Press
Total Pages 530
Release 2008-12-18
Genre Science
ISBN 9780521856065

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IAU Transactions XXVIB contains the Proceedings of the IAU XXVII General Assembly held in Prague, 14-25 August 2006, hosting a total of 2412 participants from 73 countries. The Assembly featured a rich scientific program, comprising 6 Symposia, 17 Joint Discussions and 7 Special Sessions. During the program about 650 papers were presented and more than 1550 posters displayed. The Proceedings of the 6 Symposia have been published in the Proceedings of the IAU Symposia Series, and the proceedings of the Joint Discussions and Special Sessions feature in IAU Highlights of Astronomy, 14. Together with those 7 volumes, these Transactions cover the entire General Assembly. In addition to the scientific program, the XXVI General Assembly hosted the regular Business Meetings of the EC, the 12 Divisions, 40 Commissions and 75 Working Groups. This volume records the organizational and administrative business of the XXVI General Assembly and the status of the IAU membership.

Probing the Metal Enrichment of the Intergalactic Medium with Quasar Absorption Lines

Probing the Metal Enrichment of the Intergalactic Medium with Quasar Absorption Lines
Title Probing the Metal Enrichment of the Intergalactic Medium with Quasar Absorption Lines PDF eBook
Author
Publisher
Total Pages
Release 2004
Genre
ISBN

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Quasar Absorption Lines as Probes for High Redshift Superclusters

Quasar Absorption Lines as Probes for High Redshift Superclusters
Title Quasar Absorption Lines as Probes for High Redshift Superclusters PDF eBook
Author Steven E. Persh
Publisher
Total Pages 50
Release 1994
Genre
ISBN

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Quasars at All Cosmic Epochs

Quasars at All Cosmic Epochs
Title Quasars at All Cosmic Epochs PDF eBook
Author Paola Marziani
Publisher Frontiers Media SA
Total Pages 447
Release 2018-10-05
Genre
ISBN 2889456048

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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.

Structure and Evolution of the Intergalactic Medium from QSO Absorption Line Systems

Structure and Evolution of the Intergalactic Medium from QSO Absorption Line Systems
Title Structure and Evolution of the Intergalactic Medium from QSO Absorption Line Systems PDF eBook
Author Patrick Petitjean
Publisher Atlantica Séguier Frontières
Total Pages 490
Release 1997
Genre Absorption spectra
ISBN 9782863322291

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