Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9307b&link_type=abstract
HST Proposal ID #9307
Physics
Hst Proposal Id #9307
Scientific paper
We propose WFPC2 images of microlensing event MACHO-99-BLG-22/OGLE-1999-BUL-32 which is likely to be a black hole. A likelihood analysis of this event reveals two likelihood function peaks based upon the data for this event and a standard Galactic model: he highest peak indicates a lens of ~130 Msun at a distance of ~500 pc, and the 2nd peak indicates a lens of 3-4 Msun at a distance of 6 kpc. These two different peaks are for lenses with disk and bulge kinematics, respectively. If the high-mass model is correct, then HST observations will reveal the two lensed images with magnitudes of I = 19.2 and I = 22.1 separated by about 0.12 arc sec. We have asked for two orbits for BVI observations to confirm the microlensing achromaticity prediction and to get the higher resolution available at shorter wavelengths.If we succeed in resolving the microlensing event, the separation measurement, when combined with the microlensing parallax measurement, will tell us the mass of the lens to 10-20% accuracy.
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