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Universe
Special Issues
Recent Progress in Relativistic Astrophysics
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Recent Progress in Relativistic Astrophysics

A special issue of Universe (ISSN 2218-1997).

Deadline for manuscript submissions: closed (31 August 2019) | Viewed by 3411

Special Issue Editors

Prof. Dr. Cosimo Bambi

E-Mail Website
Guest Editor
1. Center for Field Theory and Particle Physics and Department of Physics, Fudan University, Shanghai, China
2. Theoretical Astrophysics, Eberhard Karls Universität Tübingen, Tübingen, Germany
Interests: tests of general relativity and of alternative theories of gravity; black holes; quantum gravity phenomenology; high-energy astrophysics; physics of the early Universe
Special Issues, Collections and Topics in MDPI journals
Dr. Sourabh Nampalliwar

E-Mail Website
Guest Editor
Theoretical Astrophysics, Eberhard Karls Universität Tübingen, Tübingen, Germany
Interests: black hole astrophysics; gravitational waves; gravitational collapse; general relativity; tests of alternative theories of gravity

Special Issue Information

Dear Colleagues,

It is a pleasure to announce the Special Issue "Recent Progress in Relativistic Astrophysics". Black holes and neutron stars are the most extreme objects that can be found in the Universe and an ideal laboratory for testing fundamental physics. Thanks to new observations facilities, in the past 20 years there has been tremendous progress in the understanding of these objects and of their astrophysical environment. Recent detections of gravitational waves have opened a new and complementary window to the study of compact objects. While some questions have been addressed, others are still open, and new questions have arisen. The aim of this Special Issue is to review recent progress in the field of relativistic astrophysics and to point out future directions. All submissions will be peer reviewed before being accepted for publication.

Prof. Dr. Cosimo Bambi
Dr. Sourabh Nampalliwar
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Universe is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • high energy astrophysics
  • black holes
  • neutron stars
  • gravitational waves

Published Papers (1 paper)

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Research

19 pages, 4131 KiB  
Article
The Sub-Eddington Boundary for the Quasar Mass–Luminosity Plane: A Theoretical Perspective
by David Garofalo, Damian J. Christian and Andrew M. Jones
Universe 2019, 5(6), 145; https://doi.org/10.3390/universe5060145 - 11 Jun 2019
Cited by 12 | Viewed by 2988
Abstract
By exploring more than sixty thousand quasars from the Sloan Digital Sky Survey Data Release 5, Steinhardt & Elvis discovered a sub-Eddington boundary and a redshift-dependent drop-off at higher black hole mass, possible clues to the growth history of massive black holes. Our [...] Read more.
By exploring more than sixty thousand quasars from the Sloan Digital Sky Survey Data Release 5, Steinhardt & Elvis discovered a sub-Eddington boundary and a redshift-dependent drop-off at higher black hole mass, possible clues to the growth history of massive black holes. Our contribution to this special issue of Universe amounts to an application of a model for black hole accretion and jet formation to these observations. For illustrative purposes, we include ~100,000 data points from the Sloan Digital Sky Survey Data Release 7 where the sub-Eddington boundary is also visible and propose a theoretical picture that explains these features. By appealing to thin disk theory and both the lower accretion efficiency and the time evolution of jetted quasars compared to non-jetted quasars in our “gap paradigm”, we explain two features of the sub-Eddington boundary. First, we show that a drop-off on the quasar mass-luminosity plane for larger black hole mass occurs at all redshifts. But the fraction of jetted quasars is directly related to the merger function in this paradigm, which means the jetted quasar fraction drops with decrease in redshift, which allows us to explain a second feature of the sub-Eddington boundary, namely a redshift dependence of the slope of the quasar mass–luminosity boundary at high black hole mass stemming from a change in radiative efficiency with time. We are able to reproduce the mass dependence of, as well as the oscillating behavior in, the slope of the sub-Eddington boundary as a function of time. The basic physical idea involves retrograde accretion occurring only for a subset of the more massive black holes, which implies that most spinning black holes in our model are prograde accretors. In short, this paper amounts to a qualitative overview of how a sub-Eddington boundary naturally emerges in the gap paradigm. Full article
(This article belongs to the Special Issue Recent Progress in Relativistic Astrophysics)
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