New Measurement of Microlensing Optical Depth and Examination of Blending in Microlensing Events
Abstract
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.
- Publication:
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American Astronomical Society Meeting Abstracts
- Pub Date:
- December 2004
- Bibcode:
- 2004AAS...205.2803T