The POINT-AGAPE survey: 4 high signal-to-noise microlensing candidates detected towards M 31

S. Paulin-Henriksson, P. Baillon, A. Bouquet, B.J. Carr, M. Creze, N.W. Evans, Y. Giraud-Heraud, A. Gould, P. Hewett, J. Kaplan, E. Kerins, Y. Le Du, A.L. Melchior, Stephen Smartt, D. Valls-Gabaud

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

We have carried out a survey of the Andromeda galaxy for unresolved microlensing (pixel lensing). We present a subset of four short timescale, high signal-to-noise microlensing candidates found by imposing severe selection criteria: the source flux variation exceeds the flux of an R = 21 magnitude star and the full width at half maximum timescale is less than 25 days. Remarkably, in three out of four cases, we have been able to measure or strongly constrain the Einstein crossing time of the event. One event, which lies projected on the M 31 bulge, is almost certainly due to a stellar lens in the bulge of M 31. The other three candidates can be explained either by stars in M 31 and M 32 or by MACHOs.
Original languageEnglish
Pages (from-to)15-21
Number of pages7
JournalAstronomy and Astrophysics
Volume405
Issue number1
DOIs
Publication statusPublished - Jul 2003

ASJC Scopus subject areas

  • Space and Planetary Science

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