The MACHO Project: Microlensing Results from 5.7 Years of Large Magellanic Cloud Observations
Alcock, Charles; Allsman, Robyn; Alves, David R; Axelrod, Tim; Becker, Andrew C; Bennett, D P; Cook, Kem H; Dalal, N; Drake, Andrew John; Freeman, Kenneth; Geha, M; Griest, K; Lehner, M J; Marshall, S L; Minniti, Dante; Nelson, C A; Peterson, Bruce; Popowski, P; Pratt, M; Quinn, Peter J; Stubbs, Christopher W; Sutherland, William J; Tomaney, A B; Vandehei, T; Welch, D L
We report on our search for microlensing toward the Large Magellanic Cloud (LMC). Analysis of 5.7 yr of photometry on 11.9 million stars in the LMC reveals 13-17 microlensing events. A detailed treatment of our detection efficiency shows that this is significantly more than the ∼2-4 events expected from lensing by known stellar populations. The timescales (t̂) of the events range from 34 to 230 days. We estimate the microlensing optical depth toward the LMC from events with 2 < t̂ < 400 days to...[Show more]
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