Kim Griest
Kim Griest
Kim Griest
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Microlensing towards bulge<br />
• 50 million stars over 7 years<br />
• >450 events, 60 on clump giants (less blended)<br />
• ~40 binary events, parallax, extended source,<br />
lensing of variable stars, etc.<br />
• Optical depth = 2.18 +.45-.38 10 -6 , agrees with<br />
models (e.g. Gould and Han 1.63 10 -6 )<br />
• Also found optical depth as a function of (b,l)<br />
and gradient in optical depth
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