Galactic bulge microlensing optical depth from eros-2

C. Hamadache (1) , L. Le Guillou (1) , P. Tisserand (1) , C. Afonso (1) , J.N. Albert (2) , J. Andersen , R. Ansari (2) , P. Bareyre (1, 3) , J.P. Beaulieu (4) , X. Charlot (1) , C. Coutures (1, 4) , R. Ferlet (4) , P. Fouqué , J.F. Glicenstein (1) , B. Goldman (1) , A. Gould , D. Graff , M. Gros (1) , J. Haissinski (2) , J. de Kat (1) , E. Lesquoy (1, 4) , C. Loup (4) , C. Magneville (1) , J.B. Marquette (4) , E. Maurice , A. Maury , A. Milsztajn (1) , M. Moniez (2) , N. Palanque-Delabrouille (1) , O. Perdereau (2) , Y.R. Rahal (2) , J. Rich (1) , M. Spiro (1) , A. Vidal-Madjar (4) , L. Vigroux (1, 4) , S. Zylberajch (1) , E. Aubourg (1, 3)

1 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 LAL - Laboratoire de l'Accélérateur Linéaire
3 APC (UMR_7164) - AstroParticule et Cosmologie
4 IAP - Institut d'Astrophysique de Paris

We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge. Light curves of $5.6\times 10^{6}$ clump-giant stars distributed over $66 \deg^2$ 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 {\rm d}

Mots clés: Galaxy:bar; Galaxy:stellar contents; Galaxy:structure; Cosmology:gravitational lensing

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

C. Hamadache, L. Le Guillou, P. Tisserand, C. Afonso, J.N. Albert, et al.. Galactic bulge microlensing optical depth from eros-2. Astronomy and Astrophysics - A&A, 2006, 454, pp.185-199. ⟨10.1051/0004-6361:20064893⟩. ⟨in2p3-00080147⟩