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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308736.0, MPI für Astronomie / Publikationen_mpia
Galactic Bulge microlensing optical depth from EROS-2
Authors:Hamadache, C.; Le Guillou, L.; Tisserand, P.; Afonso, C.; Albert, J. N.; Andersen, J.; Ansari, R.; Aubourg, É.; Bareyre, P.; Beaulieu, J. P.; Charlot, X.; Coutures, C.; Ferlet, R.; Fouqué, P.; Glicenstein, J. F.; Goldman, B.; Gould, A.; Graff, D.; Gros, M.; Haissinski, J.; de Kat, J.; Lesquoy, É.; Loup, C.; Magneville, C.; Marquette, J. B.; Maurice, É.; Maury, A.; Milsztajn, A.; Moniez, M.; Palanque-Delabrouille, N.; Perdereau, O.; Rahal, Y. R.; Rich, J.; Spiro, M.; Vidal-Madjar, A.; Vigroux, L.; Zylberajch, S.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Astronomy and Astrophysics
Start Page:185
End Page:199
Audience:Not Specified
Abstract / Description:Aims.We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge.<BR /> Methods: .Light curves of 5.6× 106 clump-giant stars distributed over 66 deg2 of the Bulge were monitored during seven Bulge seasons. 120 events were found with apparent amplifications greater than 1.6 and Einstein radius crossing times in the range 5 d<t_E<400 d. This is the largest existing sample of clump-giant events and the first to include northern Galactic fields.<BR /> Results: .In the Galactic latitude range 1.4°<|b|<7.0°, we find tau/10-6=(1.62 ± 0.23)exp [-a(|b|-3 deg)] with a=(0.43 ±0.16) deg-1. These results are in good agreement with our previous measurement, with recent measurements of the MACHO and OGLE-II groups, and with predictions of Bulge models. <BR />
Free Keywords:Galaxy: bulge; Galaxy: stellar contents; Galaxy: structure; gravitational lensing
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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