HST Imaging of MEGA Microlensing Candidates in M31

Details HST Imaging of MEGA Microlensing Candidates in M31 HST Imaging of MEGA Microlensing Candidates in M31

2005-07-12

arxiv.org/abs/astro-ph/0507287v2

Astrophys.J.633:L105-L108,2005

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJL. Higher resolution version available at http://www.astro.columbia.edu/~patrick/hst/hst_ml.pdf

Scientific paper

10.1086/498501

We investigate $HST$/ACS and WFPC2 images at the positions of five candidate microlensing events from a large survey of variability in M31 (MEGA). Three closely match unresolved sources, and two produce only flux upper limits. All are confined to regions of the color-magnitude diagram where stellar variability is unlikely to be easily confused with microlensing. Red variable stars cannot explain these events (although background supernova are possible for two). If these lenses arise in M31's halo, they are due to masses $0.15 < m / M_\odot < 0.49$ (95% certainty, for a $\delta$-function mass distribution), brown dwarfs for disk lenses, and stellar masses for bulge lenses.

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