The Central Star Cluster of the Galaxy

Details The Central Star Cluster of the Galaxy The Central Star Cluster of the Galaxy

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2459l&link_type=abstract

HST Proposal ID #2459

Physics

Hst Proposal Id #2459

Scientific paper

We propose to use the Planetary Camera on the HST to image the Galactic center at 0.1" (850 AU at 8.5 kpc) at 10326 and 8750 A. Recent observations have revealed a multitude of unusual phenomena at the center, suggesting that the Galactic center may be a low energy verion of an active galactic nucleus and may harbor a massive collapsed object. Unambiguous delineation of the central star cluster, which would provide an important constraint on the central mass distribution has been hampered by the inadequate angular resolution of ground-based observations. The HST observations will map directly the structure of the near-IR source, IRS16, which has been the focus of previous ground-based observations to define the central star cluster. The resolution and sensitivity of the proposed observations can also detect and resolve the individual K and M giant stars of the central star cluster, despite the large extinction to the center. Understanding the nearest galactic nucleus will be important for the interpretation of the more energetic active galactic nuclei.

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