Mathematics – Probability
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9518p&link_type=abstract
HST Proposal ID #9518
Mathematics
Probability
Hst Proposal Id #9518 Stellar Populations
Scientific paper
Gravitational microlensing is developing into an important astrophysical tool with diverse applications. In the coming years, about 1000 microlensing events will be discovered annually, many in real-time. However, many applications suffer from the degeneracy between the lens mass, transverse velocity and the distances. The astrometric signature of microlensing partially breaks the degeneracy. The High-Resolution Camera of the Advanced Camera for Surveys will be an ideal instrument for measuring this effect. We propose to conduct a theoretical study to prepare for such observations. These observations will lead to the first unique determination of the lens mass, and have significant impacts on the nature of the lenses toward the LMC, the model of the Galactic bar and the census of stellar mass black holes in the Galaxy. We will study what are the best microlensing events for HST astrometric studies, and the optimal strategy {frequency and duration} for such HST monitoring. The lensed stars lie preferentially on the far side of the Galactic bar due to the enhanced lensing probability by the stars on the near side. This bias leads to systematic differences in the proper motions and radial velocities of the lensed stars relative to the random stars in the Galactic bar. We will quantify these differences and their dependence on the bar model.
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