The black hole accretion code

  • We present the black hole accretion code (BHAC), a new multidimensional general-relativistic magnetohydrodynamics module for the MPI-AMRVAC framework. BHAC has been designed to solve the equations of ideal general-relativistic magnetohydrodynamics in arbitrary spacetimes and exploits adaptive mesh refinement techniques with an efficient block-based approach. Several spacetimes have already been implemented and tested. We demonstrate the validity of BHAC by means of various one-, two-, and three-dimensional test problems, as well as through a close comparison with the HARM3D code in the case of a torus accreting onto a black hole. The convergence of a turbulent accretion scenario is investigated with several diagnostics and we find accretion rates and horizon-penetrating fluxes to be convergent to within a few percent when the problem is run in three dimensions. Our analysis also involves the study of the corresponding thermal synchrotron emission, which is performed by means of a new general-relativistic radiative transfer code, BHOSS. The resulting synthetic intensity maps of accretion onto black holes are found to be convergent with increasing resolution and are anticipated to play a crucial role in the interpretation of horizon-scale images resulting from upcoming radio observations of the source at the Galactic Center.

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Author:Oliver Porth, Hector Olivares, Yosuke Mizuno, Ziri Younsi, Luciano RezzollaORCiDGND, Monika Moscibrodzka, Heino Falcke, Michael Kramer
URN:urn:nbn:de:hebis:30:3-472796
DOI:https://doi.org/10.1186/s40668-017-0020-2
ISSN:2197-7909
Parent Title (English):Computational Astrophysics and Cosmology
Publisher:Springer international
Place of publication:New York, NY [u.a.]
Document Type:Article
Language:English
Year of Completion:2017
Date of first Publication:2017/05/03
Publishing Institution:Universit├Ątsbibliothek Johann Christian Senckenberg
Release Date:2019/01/24
Volume:4
Issue:Nr. 1
Page Number:42
First Page:1
Last Page:42
Note:
Open Access: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
HeBIS-PPN:446275573
Institutes:Physik / Physik
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
Sammlungen:Universit├Ątspublikationen
Sammlung Biologie / Sondersammelgebiets-Volltexte
Licence (German):License LogoCreative Commons - Namensnennung 4.0