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Galaxies 2017, 5(1), 15; doi:10.3390/galaxies5010015

Black Hole Accretion in Gamma Ray Bursts

1
Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland
2
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland
3
Chair of Mathematical Methods in Physics, University of Warsaw, ul. Pasteura 5, 02-093 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Ioannis Contopoulos and Samantha Oates
Received: 31 August 2016 / Revised: 6 December 2016 / Accepted: 23 January 2017 / Published: 13 February 2017
(This article belongs to the Special Issue Gamma-Ray Bursts: Recent Theoretical Models and Observations)
View Full-Text   |   Download PDF [1769 KB, uploaded 13 February 2017]   |  

Abstract

We study the structure and evolution of the hyperaccreting disks and outflows in the gamma ray bursts central engines. The torus around a stellar mass black hole is composed of free nucleons, Helium, electron-positron pairs, and is cooled by neutrino emission. Accretion of matter powers the relativistic jets, responsible for the gamma ray prompt emission. The significant number density of neutrons in the disk and outflowing material will cause subsequent formation of heavier nuclei. We study the process of nucleosynthesis and its possible observational consequences. We also apply our scenario to the recent observation of the gravitational wave signal, detected on 14 September 2015 by the two Advanced LIGO detectors, and related to an inspiral and merger of a binary black hole system. A gamma ray burst that could possibly be related with the GW150914 event was observed by the Fermi satellite. It had a duration of about 1 s and appeared about 0.4 s after the gravitational-wave signal. We propose that a collapsing massive star and a black hole in a close binary could lead to the event. The gamma ray burst was powered by a weak neutrino flux produced in the star remnant’s matter. Low spin and kick velocity of the merged black hole are reproduced in our simulations. Coincident gravitational-wave emission originates from the merger of the collapsed core and the companion black hole. View Full-Text
Keywords: black hole physics; accretion, accretion disks; gravitational waves; neutrinos black hole physics; accretion, accretion disks; gravitational waves; neutrinos
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Janiuk, A.; Bejger, M.; Sukova, P.; Charzynski, S. Black Hole Accretion in Gamma Ray Bursts. Galaxies 2017, 5, 15.

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