Kim Griest

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Executive Summary • Basic Result: Searches done and show bulk of DM cannot be in compact objects with masses between Mars mass and 100 Msun • Conflicting results on whether ANY halo DM can exist in this form: 2 collaborations say yes, 2 say no • IF measurable amount of Macho halo DM exists, it would be a major new component of MW (and M31) => important consequences for galaxy formation and evolution
MACHO Collaboration (2000) • Monitored 11.9 million stars for 5.7 years • Found 13-17 events (depending on selection criteria) • Careful efficiency analysis including blending • Removed 8 Supernova behind LMC (contaminants) • Distribution in space, CMD, Amax, consistent with microlensing interpretation • Likelihood analysis to measure Macho DM, plus events in disk, LMC, etc.
Page 1 and 2: Microlensing and Dark Matter August
Page 7: LMC in neutral H looks like a face-
Page 10: •Masses 0.1 - 1.0 Msun preferred
Page 13 and 14: The number of non-Macho events is p
Page 15 and 16: LMC-23
Page 17 and 18: Much written on LMC self lensing si
Page 19 and 20: Contamination? • Contamination wa
Page 21 and 22: What do to? Other experiments!
Page 24 and 25: Combined MACHO and EROS limits on s
Page 26 and 27: LMC Limits on Macho Dark Matter •
Page 28 and 29: MEGA: M31 Microlensing Found 4 even
Page 30 and 31: Other M31 results • WeCAPP (Wende
Page 32 and 33: BULGE Microlensing: three collabora
Page 35 and 36: 34 candidate events probably from t
Page 37: Conclusion • The mystery of LMC/M

Kim Griest

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