Confirmation of a Gravitational Microlensing Black Hole Candidate

Details Confirmation of a Gravitational Microlensing Black Hole Candidate Confirmation of a Gravitational Microlensing Black Hole Candidate

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.8490b&link_type=abstract

HST Proposal ID #8490

Physics

Hst Proposal Id #8490 Field Stellar Populations

Scientific paper

We propose to obtain WFPC2 images of gravitational microlensing event MACHO-96-BLG-5 in mid-1999 in an attempt to confirm the conclusion, based upon MACHO observations, that the lens is a black hole of about 20 solar masses. This event is the longest Galactic microlensing event yet observed with an Einstein diameter crossing time of 1700 days - about 4 times longer than the second longest event, and the microlensing fit to the lightcurve indicates that the lens has a mass of around 20 solar masses. This microlensing fit predicts that the lens will be magnified by a factor of 1.26 in July, 1999, and will be slowly decreasing after this. The DD observations we propose will allow us to observe the decreasing brightness of the lensed star and test the black hole microlensing model.

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