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  A 40-billion solar mass black hole in the extreme core of Holm 15A, the central galaxy of Abell 85

Kianusch, M., Thomas, J., Saglia, R., Mazzalay, X., Erwin, P., Bender, R., et al. (2019). A 40-billion solar mass black hole in the extreme core of Holm 15A, the central galaxy of Abell 85. The Astrophysical Journal, 887(2): 195. doi:10.3847/1538-4357/ab5856.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-1051-C Version Permalink: http://hdl.handle.net/21.11116/0000-0006-1052-B
Genre: Journal Article

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Kianusch, Mehrgan1, Author              
Thomas, Jens1, Author              
Saglia, Roberto1, Author              
Mazzalay, Ximena1, Author              
Erwin, Peter1, Author              
Bender, Ralf1, Author              
Kluge, Matthias2, Author              
Fabricius, Maximilian1, Author              
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              
2Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159888              

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 Abstract: Holm 15A, the brightest cluster galaxy (BCG) of the galaxy cluster Abell 85, has an ultra-diffuse central region, ~ 2 mag fainter than the faintest depleted core of any early-type galaxy (ETG) that has been dynamically modelled in detail. We use orbit-based, axisymmetric Schwarzschild models to analyse the stellar kinematics of Holm 15A from new high-resolution, wide-field spectral observations obtained with MUSE at the VLT. We find a supermassive black hole (SMBH) with a mass of (4.0 ± 0.80) x 1010 M at the center of Holm 15A. This is the most massive black hole with a direct dynamical detection in the local universe. We find that the distribution of stellar orbits is increasingly biased towards tangential motions inside the core. However, the tangential bias is less than in other cored elliptical galaxies. We compare Holm 15A with N-body simulations of mergers between galaxies with black holes and find that the observed amount of tangential anisotropy and the shape of the light profile are consistent with a formation scenario where Holm 15A is the remnant of a merger between two ETGs with pre-existing depleted cores. We find that black hole masses in cored galaxies, including Holm 15A, scale inversely with the central stellar surface brightness and mass density, respectively. These correlation are independent of a specific parameterization of the light profile.

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 Dates: 2019-12-19
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab5856
Other: LOCALID: 3220194
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 887 (2) Sequence Number: 195 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3