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Detection of M31 Binaries via High-Cadence Pixel-Lensing Surveys | | D. Kim
; S.-J. Chung
; M. J. Darnley
; J. P. Duke
; A. Gould
; C. Han
; M. A. Ibrahimov
; M. Im
; Y.-B. Jeon
; R. G. Karimov
; E. Kerins
; C.-U. Lee
; A. Newsam
; B.-G. Park
; | | Date: |
20 Jan 2007 | | Abstract: | The Angstrom Project is using a distributed network of two-meter class telescopes to conduct a high cadence pixel-lensing survey of the bulge of the Andromeda Galaxy (M31). With the expansion of global telescope network, the detection efficiency of pixel-lensing surveys is rapidly improving. 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 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 $Gamma_{
m b}sim (7-15)f_{
m b}(N/50)$ per season, where $f_{
m b}$ is the fraction of binaries with projected separations of $10^{-3} {
m AU}< ilde{d}<10^3 {
m AU}$ 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 of $qgtrsim 0.1$ but with separations populated within a narrow range of $1 {
m AU}lesssim ilde{d}lesssim 5 {
m AU}$. 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 lens matter. | | Source: | arXiv, astro-ph/0701588 | | Services: | Forum | Review | PDF | Favorites | |
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