Bulge Microlensing Optical Depth from EROS 2 observations

Details Bulge Microlensing Optical Depth from EROS 2 observations Bulge Microlensing Optical Depth from EROS 2 observations

2003-03-04

arxiv.org/abs/astro-ph/0303100v1

Astron.Astrophys. 404 (2003) 145-156

Astronomy and Astrophysics

Astrophysics

18 pages, 15 images, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20030307

We present a measurement of the microlensing optical depth toward the Galactic bulge based on the analysis of 15 contiguous1 square degrees fields centered on (l=2.5 deg, b=-4.0 deg) and containing 1.42 million clump-giant stars (belonging to the extended clump area) monitored during almost three bulge seasons by EROS (Experience de Recherche d'Objets Sombres). We find a microlensing optical depth towards the bulge tau_bulge=0.94 +/- 0.29 10^-6 averaged over all fields, based on 16 microlensing events with clump giants as sources. This value is substantially below several other determinations by the MACHO and OGLE groups and is more in agreement with what is expected from axisymmetric and non-axisymmetric bulge models.

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