Variability of Galactic Center Sources

Details Variability of Galactic Center Sources Variability of Galactic Center Sources

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7214m&link_type=abstract

HST Proposal ID #7214

Physics

Hst Proposal Id #7214 Agn/Quasars

Scientific paper

A broad range of accretion disk models with black hole masses appropriate to the Galactic Center {0.5-3.0 million solar masses} implies variability at the 2-25% level on time scales as short as 10 minutes. As the current literature provides only upper limits for the near-infrared counterpart to the radio source Sgr A*, this proposal endeavors to detect the source as well as observe its variability. An observed light-curve will test general relativistic predictions and will further constrain black hole models. We will search for source flickering by repeated imaging in broadband filters {F160W and F110M} and in [SiVI]. The F160W and F110M filters will provide the best forum for finding a continuum object and establishing its color. The extinction-corrected fluxes can then constrain accretion disk models. [SiVI] is associated with Active Galactic Nuclei, and requires very high densities and temperatures which one would expect in an accretion disk but not in any of the stellar sources in the field.

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