AgapeZ1: a large amplification microlensing event or an odd variable star towards the inner bulge of M31

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator Gondolo, Paolo
Other Author Ansari, R.; Auriere, M.; Baillon, P.; Bouquet, A.; Coupinot, G.; Coutures, Ch.; Ghesquiere, C.; Giraud-Heraud, Y.; Hecquet, J.; Kaplan, J.,; Kim, A.; Le Du, Y.; Melchior, A. L.; Moniez, M.; Picat, J. P.; Soucail, G.
Title AgapeZ1: a large amplification microlensing event or an odd variable star towards the inner bulge of M31
Date 1999
Description AgapeZ1 is the brightest and the shortest duration microlensing candidate event found to date in the Agape experiment. It occurred only 4200 from the centre of M31 at RA = 0h42m41:47s and Dec = 41°16'39.1" (J2000). Our photometry shows that the half intensity duration of the event is 5.3 days and at maximum brightness its magnitude is R = 17:9 (MR ~ −6) with B − R = 0:80 mag colour. A search on HST archives produced a single resolved star within the projected event position error box. Its magnitude is R = 22, and its colour is compatible with that of the event at the 2σ level. If this event is identified with the HST star, the implied amplification is about 4 magnitudes or 40 in brightness. This would lead to an Einstein crossing time radius of about 60 days. AgapeZ1 could be a bulge/bulge microlensing event involving a binary star.
Type Text
Publisher EDP Sciences
Subject AgapeZ1; Galaxy; Halo; Cosmology; Gravitational lensing; M31; Pixel method
Subject LCSH Dark matter (Astronomy); Andromeda Galaxy; Microlensing (Astrophysics)
Language eng
Bibliographic Citation Ansari, R., Auriere, M., Baillon, P., Bouquet, A., Coupinot, G., Coutures, Ch., Ghesquiere, C., Giraud- Heraud, Y., Gondolo, P., Hecquet, J., Kim, A., Le Du, Y., Melchior, A. L., Moniez, M., Picat, J. P., & Soucail, G. (1999). AgapeZ1: a large amplification microlensing event or an odd variable star towards the inner bulge of M31. Astronomy and Astrophysics Letters, 344, L49-L52.
Rights Management (c)EDP Sciences http://publications.edpsciences.org/
Format Medium application/pdf
Format Extent 302,877 bytes
Identifier ir-main,9242
ARK ark:/87278/s6b5736x
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2021-05-06
ID 705727
Reference URL https://collections.lib.utah.edu/ark:/87278/s6b5736x