High Spatial Resolution Spectroscopy of the Massive Globular Cluster G1

Details High Spatial Resolution Spectroscopy of the Massive Globular Cluster G1 High Spatial Resolution Spectroscopy of the Massive Globular Cluster G1

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9099r&link_type=abstract

HST Proposal ID #9099

Physics

Hst Proposal Id #9099 Galaxies

Scientific paper

We propose to obtain high spatial resolution, long-slit spectroscopy of the most luminous globular cluster in the Local Group, G1 in M31. The kinematic structure obtained with these data will provide a stringent test of whether a central black hole exists, thereby determining whether globular clusters share the same intimate connection that normal galaxies do with their black holes. The central surface brightness of the core of this cluster reaches 13.5 V mag arcsec^-2, and the core radius of the cluster is 0.9 pc; both these properties allow for detailed kinematic information using HST. If a black hole is present, and G1 falls on the black-hole mass/sigma correlation recently established for bulges and ellipticals, the mass should be 6*10^4M_odot, and the velocity dispersion should rise to 36 km s^-1. Detection of a black hole in G1 would extend the black-hole mass/sigma relationship to masses 100 times lower than the lowest mass nuclear black hole currently known, and establish a solid connection between the formation of galaxies and globular clusters. The data will also provide the basis for an excellent dynamical model of G1 and a study of stellar population gradients in this unique cluster. Parallel imaging with WFPC2 will produce a very deep color-magnitude diagram of the M31 halo field stars adjacent to G1. Short exposures of the M31 halo hints at a possible intermediate-age population, which may be revealed in deeper parallels.

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