HST imaging of MEGA Microlensing Candidates in M31 [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy, 2005.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Additional Creators:
- Stanford Linear Accelerator Center
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information - Access Online:
- www.osti.gov
- Summary:
- 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 0.08 < m/M{sub {circle_dot}} < 0.85 (95% certainty, for a δ-function mass distribution), brown dwarfs for disk/disk, and stellar masses for disk/bulge ''self-lensing''.
- Subject(s):
- Note:
- Published through SciTech Connect.
07/14/2005.
"slac-pub-11360"
"astro-ph/0507287"
Astrophysical Journal 633 ISSN 0004-637X; ASJOAB FT
Baltz, Edward A.; de Jong, Jelte T.A.; Widrow, Lawrence M.; Cseresnjes, Patrick; Kuijken, Konrad; Crotts, Arlin P.S.; Gyuk, Geza; Bergier, Alex. - Funding Information:
- AC02-76SF00515
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