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

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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 α=-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.
ApJ Letter in press

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http://salesiana.dossiersoluciones.com/handle/123456789/144465

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0709.0119
 http://arxiv.org/abs/0709.0119
 Astrophysical Journal, 668, 139L (2007)
 doi:10.1086/522927

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arXiv