Unveiling Gargantua: A new search strategy for the most massive central cluster black holes

Brockamp, M., Baumgardt, H., Britzen, S. and Zensus, A. (2016) Unveiling Gargantua: A new search strategy for the most massive central cluster black holes. Astronomy and Astrophysics, 585 A153.1-A153.11. doi:10.1051/0004-6361/201526873

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Author Brockamp, M.
Baumgardt, H.
Britzen, S.
Zensus, A.
Title Unveiling Gargantua: A new search strategy for the most massive central cluster black holes
Journal name Astronomy and Astrophysics   Check publisher's open access policy
ISSN 0004-6361
Publication date 2016-01-01
Year available 2016
Sub-type Article (original research)
DOI 10.1051/0004-6361/201526873
Open Access Status File (Publisher version)
Volume 585
Start page A153.1
End page A153.11
Total pages 11
Place of publication Les Ulis, France
Publisher EDP Sciences
Language eng
Formatted abstract
Aims. We aim to unveil the most massive central cluster black holes in the Universe.

We present a new search strategy, which is based on a black hole mass gain sensitive calorimeter and which links the innermost stellar density profile of a galaxy to the adiabatic growth of its central supermassive black hole (SMBH). As a first step we convert observationally inferred feedback powers into SMBH growth rates using reasonable energy conversion efficiency parameters, ϵ. In the main part of this paper we use these black hole growth rates, sorted in logarithmically increasing steps encompassing our whole parameter space, to conduct N-body computations of brightest cluster galaxies (BCGs) with the newly developed Muesli software. For the initial setup of galaxies, we use core-Sérsic models to account for SMBH scouring.

Results. We find that adiabatically driven core regrowth is significant at the highest accretion rates. As a result, the most massive black holes should be located in BCGs with less pronounced cores when compared to the predictions of empirical scaling relations, which are usually calibrated in less extreme environments. For efficiency parameters ϵ< 0.1, BCGs in the most massive, relaxed, and X-ray luminous galaxy clusters might even develop steeply rising density cusps. Finally, we discuss several promising candidates for follow-up investigations, among them the nuclear black hole in the Phoenix cluster. Based on our results, its central black hole might have a mass of the order of 1011 M.
Keyword Accretion
Accretion disks
Black hole physics
Galaxies: clusters: general
Galaxies: elliptical and lenticular, cD
Methods: numerical
Quasars: supermassive black holes
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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