Proper Motion of Stars Near SGRA*

Details Proper Motion of Stars Near SGRA* Proper Motion of Stars Near SGRA*

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7225b&link_type=abstract

HST Proposal ID #7225

Physics

Hst Proposal Id #7225 Agn/Quasars

Scientific paper

Sgr A* may be a black hole with a mass close to a million solar masses. Radial velocity data suggest that a large unseen mass coincides with SgrA*, but uncertainties in the shapes of the stellar orbits and the possiblity of distributed forms of dark matter being present have limited our ability to determine a precise mass for SgrA*. Proper motions measured over the lifetime of NICMOS will yield an accurate mass for Sgr A* and hence settle the issue of its black hole character. The locations of the Galactic Center sources will be measured one per year. At several epochs, NGC 4147, a globular cluster with low velocity dispersion and lying at a distance where the same exposure pattern as on the Galactic Center can be used, will also be observed as a check on the fidelity of the proper motions. N.B. This program requires 1 orbit in cycle 10 and 2 in cycle 11. The phase I exposure list could not handle these entries.

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