The surface density profile of NGC 6388: a good candidate for harboring an intermediate-mass black hole

Details The surface density profile of NGC 6388: a good candidate for harboring an intermediate-mass black hole The surface density profile of NGC 6388: a good candidate for harboring an intermediate-mass black hole

2007-09-02

arxiv.org/abs/0709.0119v1

Astrophysical Journal, 668, 139L (2007)

Astronomy and Astrophysics

Astrophysics

ApJ Letter in press

Scientific paper

10.1086/522927

We have used a combination of high resolution (HST ACS-HRC, ACS-WFC, and WFPC2) and wide-field (ESO-WFI) observations of the galactic globular cluster NGC 6388 to derive its center of gravity, projected density profile, and central surface brightness profile. While the overall projected profiles are well fit by a King model with intermediate concentration (c=1.8) and sizable core radius (rc=7"), a significant power law (with slope \alpha=-0.2) deviation from a flat core behavior has been detected within the inner 1 arcsecond. These properties suggest the presence of a central intermediate mass black hole. The observed profiles are well reproduced by a multi-mass isotropic, spherical model including a black hole with a mass of ~5.7x10^3 Msol.

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