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28 March 2024
 
  » arxiv » astro-ph/0507287

 Article overview


HST Imaging of MEGA Microlensing Candidates in M31
Patrick Cseresnjes ; Arlin P.S. Crotts ; Jelte T.A. de Jong ; Alex Bergier ; Edward A. Baltz ; Geza Gyuk ; Konrad Kuijken ; Lawrence M. Widrow ;
Date 12 Jul 2005
Subject astro-ph
AbstractWe 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.
Source arXiv, astro-ph/0507287
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