The physical nature of OGLE gravitational lenses

Details The physical nature of OGLE gravitational lenses The physical nature of OGLE gravitational lenses

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..229b&link_type=abstract

Astronomy Reports, Volume 42, Issue 2, March 1998, pp.229-232

Astronomy and Astrophysics

Astronomy

2

Scientific paper

A model fitting analysis is performed for six light curves resulting from gravitational microlensing of Galactic bulge stars, obtained during the Optical Gravitational Lensing Experiment. For three of these events, allowing for radiation from the gravitational lens yields a better fit than provided by models with a dark, compact lens or with a lens formed of a cluster of weakly interacting massive particles. The characteristics and distances of the lensing and lensed stars are estimated for these events. It is proposed that ordinary late-type dwarfs can play the role of the gravitational lens in about half the bulge stellar microlensing events. This would make it possible to partially explain the observed excess in the optical depth to microlensing for bulge stars over that predicted by existing theoretical models for the distribution of massive compact objects in the Galactic halo.

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