Halo Microlensing: Direct Detection of a Microlens

Details Halo Microlensing: Direct Detection of a Microlens Halo Microlensing: Direct Detection of a Microlens

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9394c&link_type=abstract

HST Proposal ID #9394

Computer Science

Hst Proposal Id #9394

Scientific paper

The MACHO project has recently released 5.7 years of LMC microlensing data, presenting 17 candidate microlensing events. These events suggest an 8-50 MACHO halo and a most likely MACHO mass of 0.2-0.9 M_odot. However, nearly a decade after the first reported event {Alcock et al. 1993} there still remains much debate about the nature and location of the lensing matter. MACHO has also obtained WFPC2 follow-up data of the microlensing source stars, to date we have observed 16 candidates with HST. The WFPC2 follow-up data of MACHO event LMC-5 provided unexpected insight into the nature of the lens. This image revealed a very red, faint object displaced by 0.134^ from the source star which may well be the first direct detection of the dark matter component {lens} of a microlensing event. A second epoch of WFPC2 photometry will verify the proper motion of the lens and allow for a parallax measurement of its distance.

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