Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.287..629w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 287, Issue 3, pp. 629-633.
Astronomy and Astrophysics
Astronomy
1
Dark Matter, Gravitational Lensing
Scientific paper
We present a new test which has the power to locate, in a statistical sense, the population of objects responsible for the microlensing events seen in photometric monitoring of Galactic bulge fields. The test involves a comparison of the kinematics of stars that have exhibited lensing events with those that have not. No significant differences are expected between these groups if the lenses are disc objects, but if the lenses are themselves in the bulge then the kinematics of the two subsamples may be quite different. Using a simple dynamical model of the Galactic bulge, based on a spheroidal mass distribution, we compute the transverse velocity distributions for each sample; this model shows quantitatively that the expected differences between samples can be significant if the lenses are bulge objects, and the test should yield a definitive result if the individual measurement errors can be made sufficiently small. Further, we argue that the radial velocity distributions of lensed and control samples are also likely to be significantly different, in the case of bulge lenses - these distributions are easier to measure than those for the transverse velocity, but harder to model sensibly.
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