Fifty Years of Quasars

Author: Mauro D'Onofrio
Publisher: Springer Science & Business Media
ISBN: 9783642275630
Release Date: 2012-06-30
Genre: Science

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.

From the Realm of the Nebulae to Populations of Galaxies

Author: Mauro D'Onofrio
Publisher: Springer
ISBN: 9783319310060
Release Date: 2016-07-26
Genre: Science

In order to outline possible future directions in galaxy research, this book wants to be a short stopover, a moment of self-reflection of the past century of achievements in this area. Since the pioneering years of galaxy research in the early 20th century, the research on galaxies has seen a relentless advance directly connected to the parallel exponential growth of new technologies. Through a series of interviews with distinguished astronomers the editors provide a snapshot of the achievements obtained in understanding galaxies. While many initial questions about their nature have been addressed, many are still open and require new efforts to achieve a solution. The discussions may reveal paradigms worthwhile revisiting. With the help of some of those scientists who have contributed to it, the editors sketch the history of this scientific journey and ask them for inspirations for future directions of galaxy research.

Quasars at All Cosmic Epochs

Author: Paola Marziani
Publisher: Frontiers Media SA
ISBN: 9782889456048
Release Date: 2018-10-05
Genre:

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.

INIS Atomindex

Author:
Publisher:
ISBN: MINN:31951D00544770Z
Release Date: 1984
Genre: Nuclear energy


Der neue Kosmos

Author: A. Unsöld
Publisher: Springer-Verlag
ISBN: 9783662065334
Release Date: 2013-07-02
Genre: Science


Bulletin of the Atomic Scientists

Author:
Publisher:
ISBN:
Release Date: 1969-09
Genre:

The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.

Books in Print

Author:
Publisher:
ISBN: STANFORD:36105002106081
Release Date: 1995
Genre: American literature


Vor dem Anfang

Author: Martin Rees
Publisher: S. Fischer Verlag
ISBN: 9783105608500
Release Date: 2015-12-15
Genre: Science

Gibt es neben unserem noch andere Universen? Wie und wann sind sie entstanden? Welche physikalischen Gesetze herrschen dort? – Die Grundfragen der Kosmologie, beantwortet von Martin Rees, einem der renommiertesten Astronomen der Welt. (Dieser Text bezieht sich auf eine frühere Ausgabe.)

Astronomy

Author:
Publisher:
ISBN: UOM:49015003249100
Release Date: 1987
Genre: Astronomy


Das Universum f r Eilige

Author: Neil deGrasse Tyson
Publisher: Carl Hanser Verlag GmbH Co KG
ISBN: 9783446259539
Release Date: 2018-01-29
Genre: Science

Der nach Stephen Hawking prominenteste Astrophysiker des Planeten hat das ultimative Kompendium über den Kosmos verfasst. In Neil deGrasse Tysons Bestseller ist alles versammelt, was wir über das Universum wissen: über Exoplaneten und Dunkle Energie, über Zwerggalaxien und den Urknall. Der Autor begeistert wie kein Zweiter mit funkelndem Witz für die Wunder des Weltalls. Zugleich regt er zum Nachdenken über unseren Platz im Universum an und zu Demut angesichts kosmischer Skalen. Sein „Universum für Eilige“ ist das perfekte Buch für alle, die auf nur 200 Seiten die heutige Astrophysik verstehen – und sich dabei auf hohem Niveau unterhalten lassen möchten.

Das Harnack Prinzip

Author: Bernhard Vom Brocke
Publisher: Walter de Gruyter
ISBN: 9783110802443
Release Date: 1996-01-01
Genre: History


Choice

Author:
Publisher:
ISBN: UOM:39015064547840
Release Date: 1990
Genre: Academic libraries


Die Sonne Stern unserer Erde

Author: Kenneth R. Lang
Publisher: Springer-Verlag
ISBN: 9783662066829
Release Date: 2013-07-02
Genre: Science

Eine faszinierende Entdeckungsreise zur Sonne und ihren unsichtbaren Welten. Für Fachkundige ebenso spannend zu lesen wie für Astronomie-Interessierte, führt das Buch verständlich in die Physik der Sonne ein und zeigt eindrucksvoll die Bedeutung des Sonnenlichts für das Leben auf der Erde. Gestützt auf neueste Forschungsergebnisse aus Radioteleskop- und Satellitenbeobachtungen beschreibt Kenneth Lang die gewaltigen atomenergetischen Prozesse der Sonne, den von ihr ausgehenden Neutrinofluß, ihre seismischen Aktivitäten, ihre Magnetfelder und Sonnenflecken, die Sonnenausbrüche und Protuberanzen, den Sonnenwind und den Einfluß der Sonne auf unser Klima und Wetter. Das Buch ist mit einer Fülle hervorragender Abbildungen ausgestattet, u.a. mit Fotomaterial der NASA, das hier zum ersten Mal veröffentlicht wird.