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تعداد نتایج: 1809

Fifty Years of Quasars

From Early Observations and Ideas to Future Research

By Mauro D'Onofrio, Paola Marziani, Jack W. Sulentic
Publisher: Springer Science & Business Media, 2012-06-30
Pages: 613
Language: en
ISBN_13:9783642275630
ISBN_10:364227563X
Subject: Science

Probing Galaxies Through Quasar Absorption Lines (IAU C199)

جزئیات و درخواست

By International Astronomical Union. Colloquium
Publisher: Cambridge University Press, 2005-12
Pages: 540
Language: en
ISBN_10:0521852056
ISBN_13:9780521852050
Subject: Science

Quasar Astronomy

جزئیات و درخواست

By Daniel W. Weedman
Publisher: Cambridge University Press, 1988-04-14
Pages: 236
Language: en
ISBN_10:0521356741
ISBN_13:9780521356749
Subject: Science

GravItational Lensing of Quasars

جزئیات و درخواست

By Alexander Eigenbrod
Publisher: CRC Press, 2011-12-14
Pages: 154
Language: en
ISBN_13:9781439873540
ISBN_10:1439873542
Subject: Science

Quasars and Active Galactic Nuclei

An Introduction

جزئیات و درخواست

By Ajit K. Kembhavi, Jayant V. Narlikar
Publisher: Cambridge University Press, 1999-03-11
Pages: 488
Language: en
ISBN_10:0521479894
ISBN_13:9780521479899
Subject: Science

$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.$

جزئیات و درخواست

By Paola Marziani, Mauro D'Onofrio, Ascensión del Olmo, Deborah Dultzin
Publisher: Frontiers Media SA, 2018-10-05
Pages: 447
Language: en
ISBN_13:9782889456048
ISBN_10:2889456048

Quasar, Quasar, Burning Bright

جزئیات و درخواست

By Isaac Asimov
Publisher: Doubleday Books, 1978
Pages: 248
Language: en
OTHER:UCAL:B4534520
Subject: Nature

Quasars, Redshifts, and Controversies

جزئیات و درخواست

By Halton C. Arp
1987
Pages: 216
Language: en
OTHER:UOM:39015015758488
Subject: Science

What Are Quasars?

جزئیات و درخواست

By Larry Slawson
Publisher: Larry Slawson via PublishDrive, 2019-05-10
Pages: 19
Language: en
OTHER:PKEY:6610000173822
Subject: Science

From Quark to Quasar

Notes on the Scale of the Universe

جزئیات و درخواست

By Peter H. Cadogan
1985
Language: en
ISBN_10:0052101355
ISBN_13:9780052101351
Subject: Cosmological distances

Quasars

Their Importance in Astronomy and Physics

جزئیات و درخواست

By Franz Daniel Kahn, Henry Procter Palmer
Publisher: Manchester University Press, 1967
Pages: 152
Language: en
Subject: Quasars

Quasar Hosts

Proceedings of the ESO-IAC Conference Held on Tenerife, Spai...

جزئیات و درخواست

By David L. Clements, Ismael Perez-Fournon
Publisher: Springer Science & Business Media, 2013-11-11
Pages: 348
Language: en
ISBN_13:9783540696483
ISBN_10:3540696482
Subject: Science

Black Holes, Quasars, and the Universe

جزئیات و درخواست

By Harry L. Shipman
1980
Pages: 356
Language: en
ISBN_10:0395284996
ISBN_13:9780395284995
Subject: Science

Quasars and Pulsars

جزئیات و درخواست

By Dewey B. Larson
1971
Pages: 200
Language: en
OTHER:UCSD:31822023181043
Subject: Pulsating stars

The Jet Paradigm

From Microquasars to Quasars

جزئیات و درخواست

By Tomaso Belloni
Publisher: Springer, 2009-12-21
Pages: 296
Language: en
ISBN_13:9783540769378
ISBN_10:3540769374
Subject: Science

Galaxies, Quasars And Cosmology

جزئیات و درخواست

By Lizhi Fang, Remo Ruffini
Publisher: World Scientific, 1985-12-01
Pages: 231
Language: en
ISBN_13:9789814518949
ISBN_10:9814518948
Subject: Science

Quasar

جزئیات و درخواست

By Jamil Nasir
Publisher: Spectra, 1995
Pages: 207
Language: en
ISBN_10:0553568868
ISBN_13:9780553568868
Subject: Fiction

Asteroids to Quasars

A Symposium Honoring William Liller

جزئیات و درخواست

By Phyllis M. Lugger
Publisher: Cambridge University Press, 2004-12-16
Language: en
ISBN_13:9780521617048
ISBN_10:0521617049
Subject: Science

From Quark to Quasar

جزئیات و درخواست

By Peter H. Cadogan
1985
Pages: 183
Language: en
OTHER:OCLC:1035149098
Subject: Cosmological distances

In Quest of Quasars

An Introduction to Stars and Starlike Objects

جزئیات و درخواست

By Ben Bova
1969
Pages: 216
Language: en
OTHER:UCAL:B4520757
Subject: Science

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