2010A&A...514A..52M


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET12:33:44

2010A&A...514A..52M - Astronomy and Astrophysics, volume 514, A52-52 (2010/5-1)

A mass estimate of an intermediate-mass black hole in ω Centauri.

MIOCCHI P.

Abstract (from CDS):

The problem of the existence of intermediate-mass black holes (IMBHs) at the centre of globular clusters is a hot and controversial topic in current astrophysical research with important implications in stellar and galaxy formation. The purpose of this paper is to provide further evidence on the presence of an IMBH in ω Centauri and to give an independent estimate of its mass. We employed a self-consistent spherical model with anisotropic velocity distribution. It consists in a generalisation of the King model by including the Bahcall-Wolf distribution function in the IMBH vicinity. By the parametric fitting of the model to recent HST/ACS data for the surface brightness profile, we found an IMBH to cluster total mass ratio of Mo/M=5.8–1.2+0.9x10–3. It is also found that the model yields a fit of the line-of-sight velocity dispersion profile that is better without mass segregation than in the segregated case. This confirms the current thought of a non-relaxed status for this peculiar cluster. The best fit model to the kinematic data leads, moreover, to a cluster total mass estimate of M=(3.1 ±0.3)x106M, thus giving an IMBH mass in the range 1.3x104<Mo<2.3x104M (at 1σ confidence level). A slight degree of radial velocity anisotropy in the outer region (r>12') is required to match the outer surface brightness profile.

Abstract Copyright:

Journal keyword(s): black hole physics - methods: analytical - methods: numerical - Galaxy: kinematics and dynamics - globular clusters: individual: NGX 5139{ω Centauri (NGC 5139)} - stars: kinematics and dynamics

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Mayall II GlC 00 32 46.53 +39 34 40.5   14.564 13.807 13.208 12.684 ~ 372 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11159 1
3 ESO 243-49 GiG 01 10 27.746 -46 04 27.41 16.54 14.92   13.48   ~ 155 0
4 NGC 2808 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1270 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3056 0
6 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 818 1
7 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 923 0

    Equat.    Gal    SGal    Ecl

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