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تعداد نتایج: 833

Variability of Active Galactic Nuclei

جزئیات و درخواست

1991
Language: en
OTHER:OCLC:1391902602
Subject: Active galaxies

Active Galactic Nuclei

جزئیات و درخواست

By Volker Beckmann, Chris Shrader
Publisher: John Wiley & Sons, 2013-08-29
Pages: 390
Language: en
ISBN_13:9783527666805
ISBN_10:352766680X
Subject: Science

Variability of Active Galaxies

Proceedings of a Workshop of the Sonderforschungsbereich 328...

جزئیات و درخواست

By Wolfgang J. Duschl
Publisher: Springer, 1991
Pages: 332
Language: en
OTHER:UOM:39015021816528
Subject: Science

The Physics and Evolution of Active Galactic Nuclei

جزئیات و درخواست

By Hagai Netzer
Publisher: Cambridge University Press, 2013-09-16
Pages: 369
Language: en
ISBN_13:9781107021518
ISBN_10:1107021510
Subject: Science

Variability of Blazars

جزئیات و درخواست

By E. VALTAOJA (Ed), Mauri Valtonen
Publisher: Cambridge University Press, 1992
Pages: 484
Language: en
ISBN_10:0521413516
ISBN_13:9780521413510
Subject: Science

An Introduction to Active Galactic Nuclei

جزئیات و درخواست

By Bradley M. Peterson
Publisher: Cambridge University Press, 1997-02-13
Pages: 258
Language: en
ISBN_10:0521479118
ISBN_13:9780521479110
Subject: Science

Multiwavelength AGN Surveys and Studies (IAU S304)

$Active galactic nuclei (AGN) are among the most interesting astrophysical objects in the Universe. IAU Symposium 304, dedicated to marking the centenary of B. E. Markarian's birth, addresses the most important questions in this area: understanding the possible evolutionary and/or physical connections between the different classes of AGN; the relation of AGN to their host galaxies; and understanding the true fraction of heavily obscured AGN in order to determine the true AGN luminosity function and its variation with redshift. This volume's topics include: historical spectral and colorimetric surveys, multiwavelength AGN surveys, AGN statistics, unification and other models of AGN, AGN feedback in galaxies and clusters, their host galaxies and environments, binary AGN and merging supermassive black holes, AGN variability, and future large projects. This fresh summary of AGN surveys is especially useful for researchers engaged in this exciting field and helping them plan for future surveys and observations.$

جزئیات و درخواست

By Areg M. Mickaelian, David B. Sanders
Publisher: Cambridge University Press, 2014-08-21
Language: en
ISBN_10:110704524X
ISBN_13:9781107045248
Subject: Science

AGN Variability from X-rays to Radio Waves

Proceedings of a Workshop Held at Crimean Astrophysical Obse...

جزئیات و درخواست

By C. Martin Gaskell
Publisher: Astronomical Society of the Pacific, 2006
Pages: 336
Language: en
OTHER:UVA:X030267849
Subject: Science

Active Galactic Nuclei

جزئیات و درخواست

By Professor R. D. Blandford, Professor H. Netzer, Professor L. Woltjer, Dr. T. J.-L. Courvoisier, Professor M. Mayor
Publisher: Springer, 2013-12-14
Pages: 289
Language: en
ISBN_13:9783662398166
ISBN_10:3662398168
Subject: Science

Physics of Active Galactic Nuclei at all Scales

جزئیات و درخواست

By Danielle Alloin, Rachel Johnson, Paulina Lira
Publisher: Springer, 2006-09-07
Pages: 243
Language: en
ISBN_13:9783540346210
ISBN_10:354034621X
Subject: Science

Planets, Stars and Stellar Systems

Volume 6: Extragalactic Astronomy and Cosmology

جزئیات و درخواست

By William C Keel
Publisher: Springer, 2013-02-27
Language: en
ISBN_10:9400756089
ISBN_13:9789400756083
Subject: Science

Active Galactic Nuclei

جزئیات و درخواست

By Francoise Combes
Publisher: John Wiley & Sons, 2022-09-21
Pages: 324
Language: en
ISBN_13:9781789450873
ISBN_10:178945087X
Subject: Science

The Nature of Compact Objects in Active Galactic Nuclei

Proceedings of the 33rd Herstmonceux Conference, Held in Cam...

جزئیات و درخواست

By Andrew Robinson, Roberto Juan Terlevich
Publisher: Cambridge University Press, 1994-03-03
Pages: 466
Language: en
ISBN_10:0521464803
ISBN_13:9780521464802
Subject: Science

Quasars and Active Galactic Nuclei

An Introduction/cAjit K. Kembhavi, Jayant V. Narlikar

جزئیات و درخواست

By Ajit K. Kembhavi
1999
Language: en
OTHER:OCLC:1463530269
Subject: Active galactic nuclei

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

Active Galactic Nuclei

جزئیات و درخواست

By John Edward Dyson
Publisher: Manchester University Press, 1985
Pages: 404
Language: en
ISBN_10:0719010977
ISBN_13:9780719010972
Subject: Science

The Physics and Evolution of Active Galactic Nuclei

جزئیات و درخواست

By Hagai Netzer
Publisher: Cambridge University Press, 2013-09-16
Pages: 369
Language: en
ISBN_13:9781107310995
ISBN_10:1107310997
Subject: Science

Astronomical Data Analysis Software and Systems XIV

Proceedings of a Meeting Held in Pasadena, California, USA, ...

جزئیات و درخواست

By Patrick L. Shopbell, Matthew C. Britton, Rick Ebert
2005
Pages: 776
Language: en
OTHER:STANFORD:36105126889299
Subject: Computers

Quasars at All Cosmic Epochs

$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

Nuclear Activity in Galaxies Across Cosmic Time (IAU S356)

جزئیات و درخواست

By Mirjana Pović, Paola Marziani, Josefa Masegosa, Hagai Netzer, Seblu H. Negu
Publisher: Cambridge University Press, 2020-11-30
Pages: 400
Language: en
ISBN_10:1108492010
ISBN_13:9781108492010
Subject: Science

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