New Measurement of Microlensing Optical Depth and Examination of Blending in Microlensing Events

Details New Measurement of Microlensing Optical Depth and Examination of Blending in Microlensing Events New Measurement of Microlensing Optical Depth and Examination of Blending in Microlensing Events

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.2803t&link_type=abstract

American Astronomical Society Meeting 205, #28.03; Bulletin of the American Astronomical Society, Vol. 36, p.1391

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new determination of the optical depth to microlensing to the Galactic bulge. We select a sample of 62 clump giant events (60 unique) and calulate the optical depth. With a detailed efficiency analysis we find τ = 2.17-0.38+0.47× 10-6 at (l,b) = (1 ° 50, -2 ° 68). We also examine the problem of blending and whether it strongly effects our measurement. Photometric detection of blending is also examined. KG and CT were supported in part by the DoE under grant DEFG0390ER40546.

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