A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31
| Data(s) |
01/06/2001
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| Resumo |
We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey toward M31. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of t(E) = 10.4 days, a maximum magnification of A(max) similar to 18, and a lens-source proper motion mu (rel) > 0.3 mu as day(-1). The event has a projected separation of 8' from the center of M31, beyond the bulk of the stellar lens population. There are three plausible identifications/locations for the lensing object: a massive compact halo object (MACHO) in either M31 or the Milky Way, or a star in the M31 disk. The most probable mass is 0.06 M-. for an M31 MACHO, 0.02 M-. for a Milky Way MACHO, and 0.2 M-. for an M31 stellar lens. While the stellar interpretation is possible, the MACHO interpretation is the most probable for halo fractions above 20%. |
| Identificador | |
| Idioma(s) |
eng |
| Direitos |
info:eu-repo/semantics/restrictedAccess |
| Fonte |
Auriere , M , Baillon , P , Bouquet , A , Carr , B J , Creze , M , Evans , N W , Giraud-Heraud , Y , Gould , A , Hewett , P C , Kaplan , J , Kerins , E , Lastennet , E , Le Du , Y , Melchior , A L , Henriksson , S P , Smartt , S & Valls-Gabaud , D 2001 , ' A short-timescale candidate microlensing event in the point-agape pixel lensing survey of M31 ' Astrophysical Journal , vol 553 , no. 2 PART 2 , pp. L137-L140 . |
| Palavras-Chave | #/dk/atira/pure/subjectarea/asjc/1900/1912 #Space and Planetary Science |
| Tipo |
article |
