2011A&A...533A..36L


Query : 2011A&A...533A..36L

2011A&A...533A..36L - Astronomy and Astrophysics, volume 533A, 36-36 (2011/9-1)

Kinematic signature of an intermediate-mass black hole in the globular cluster NGC 6388.

LUTZGENDORF N., KISSLER-PATIG M., NOYOLA E., JALALI B., DE ZEEUW P.T., GEBHARDT K. and BAUMGARDT H.

Abstract (from CDS):

Intermediate-mass black holes (IMBHs) are of interest in a wide range of astrophysical fields. In particular, the possibility of finding them at the centers of globular clusters has recently drawn attention. IMBHs became detectable since the quality of observational data sets, particularly those obtained with HST and with high resolution ground based spectrographs, advanced to the point where it is possible to measure velocity dispersions at a spatial resolution comparable to the size of the gravitational sphere of influence for plausible IMBH masses. We present results from ground based VLT/FLAMES spectroscopy in combination with HST data for the globular cluster NGC 6388. The aim of this work is to probe whether this massive cluster hosts an intermediate-mass black hole at its center and to compare the results with the expected value predicted by the Mo-σ scaling relation. The spectroscopic data, containing integral field unit measurements, provide kinematic signatures in the center of the cluster while the photometric data give information of the stellar density. Together, these data sets are compared to dynamical models and present evidence of an additional compact dark mass at the center: a black hole. Using analytical Jeans models in combination with various Monte Carlo simulations to estimate the errors, we derive (with 68% confidence limits) a best fit black-hole mass of (17±9)x103M and a global mass-to-light ratio of M/LV=(1.6 ±0.3)M/L.

Abstract Copyright:

Journal keyword(s): black hole physics - globular clusters: individual: NGC 6388 - stars: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/533/A36): phot.dat velmap.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 6

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Number of rows : 6
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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3653 0
2 NAME Mayall II GlC 00 32 46.53 +39 34 40.5   14.564 13.807 13.208 12.684 ~ 378 1
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11380 1
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3120 0
5 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 836 1
6 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2969 0

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2021.08.03-17:36:12

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