eprintid: 10056479
rev_number: 17
eprint_status: archive
userid: 608
dir: disk0/10/05/64/79
datestamp: 2018-10-12 10:04:51
lastmod: 2020-02-12 19:05:20
status_changed: 2018-10-12 10:04:51
type: article
metadata_visibility: show
creators_name: Saxton, CJ
creators_name: Soria, R
creators_name: Wu, K
title: Dark halo microphysics and massive black hole scaling relations in galaxies
ispublished: pub
divisions: UCL
divisions: A01
divisions: B04
divisions: C06
divisions: F63
keywords: black hole physics, globular clusters: general, galaxies: haloes, galaxies: kinematics and dynamics, galaxies: structure, dark matter
note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: We investigate the black hole (BH) scaling relation in galaxies using a model in which the galaxy halo and central BH are a self-gravitating sphere of dark matter (DM) with an isotropic, adiabatic equation of state. The equipotential where the escape velocity approaches the speed of light defines the horizon of the BH. We find that the BH mass (m•) depends on the DM entropy, when the effective thermal degrees of freedom (F) are specified. Relations between BH and galaxy properties arise naturally, with the BH mass and DM velocity dispersion following m• ∝ σF/2 (for global mean density set by external cosmogony). Imposing observationally derived constraints on F provides insight into the microphysics of DM. Given that DM velocities and stellar velocities are comparable, the empirical correlation between m• and stellar velocity dispersions σ⋆ implies that 7 ≲ F < 10. A link between m• and globular cluster properties also arises because the halo potential binds the globular cluster swarm at large radii. Interestingly, for F > 6 the dense dark envelope surrounding the BH approaches the mean density of the BH itself, while the outer halo can show a nearly uniform kpc-scale core resembling those observed in galaxies.
date: 2014-12-21
date_type: published
official_url: https://doi.org/10.1093/mnras/stu1984
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1585577
doi: 10.1093/mnras/stu1984
lyricists_name: Wu, Kinwah
lyricists_id: KWUXX50
actors_name: Wu, Kinwah
actors_id: KWUXX50
actors_role: owner
full_text_status: public
publication: Monthly Notices of the Royal Astronomical Society
volume: 445
number: 4
pagerange: 3415-3434
issn: 1365-2966
citation:        Saxton, CJ;    Soria, R;    Wu, K;      (2014)    Dark halo microphysics and massive black hole scaling relations in galaxies.                   Monthly Notices of the Royal Astronomical Society , 445  (4)   pp. 3415-3434.    10.1093/mnras/stu1984 <https://doi.org/10.1093/mnras%2Fstu1984>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10056479/1/MNRAS-2014-Saxton-3415-34.pdf