2007ApJ...666..236K -
Astrophys. J., 666, 236-241 (2007/September-1)
Detection of M 31 binaries via high-cadence pixel-lensing surveys.
KIM D., CHUNG S.-J., DARNLEY M.J., DUKE J.P., GOULD A., HAN C., IBRAHIMOV M.A., IM M., JEON Y.-B., KARIMOV R.G., KERINS E., LEE C.-U., NEWSAM A., PARK B.-G. (The Angstrom Collaboration)
Abstract (from CDS):
The Angstrom Project is using a distributed network of 2 m class telescopes to conduct a high-cadence pixel-lensing survey of the bulge of the Andromeda galaxy (M31). In this paper we estimate the detection rate of binary-lens events expected from high-cadence pixel-lensing surveys toward M31 such as the Angstrom Project based on detailed simulation of events and application of realistic observational conditions. Under the conservative detection criteria that only high signal-to-noise ratio caustic-crossing events with long enough durations between caustic crossings can be firmly identified as binary-lens events, we estimate that the rate would be Γb~(7-15)fb(N/50) per season, where fb is the fraction of binaries with projected separations of 10–3 AU<d{d5}<103 AU out of all lenses and N is the rate of stellar pixel-lensing events. We find that detected binaries would have mass ratios distributed over a wide range down to q≳0.1 but with separations populated within a narrow range of 1 AU≲d{d5}≲5 AU. Implementation of an alert system and subsequent follow-up observations would be important not only for the increase of the binary-lens event rate but also for the characterization of the lens matter.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Individual: Messier Number: M31 - Cosmology: Gravitational Lensing
Simbad objects:
3
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