Bulge microlensing optical depth from EROS 2 observations $^{\bullet}$
Open Access
- 26 May 2003
- journal article
- Published by EDP Sciences in Astronomy & Astrophysics
- Vol. 404 (1) , 145-156
- https://doi.org/10.1051/0004-6361:20030307
Abstract
We present a measurement of the microlensing optical depth toward the Galactic bulge based on the analysis of 15 contiguous fields centered on and containing clump-giant stars (belonging to the extended clump area) monitored during almost three bulge seasons by EROS (Expérience de Recherche d'Objets Sombres). We find 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.Keywords
All Related Versions
This publication has 30 references indexed in Scilit:
- Spiral arms, bar shape and bulge microlensing in the Milky WayMonthly Notices of the Royal Astronomical Society, 2002
- Observation of microlensing toward the galactic spiral arms. EROS II 3 year surveyAstronomy & Astrophysics, 2001
- The MACHO Project: Microlensing Optical Depth toward the Galactic Bulge from Difference Image AnalysisThe Astrophysical Journal, 2000
- Is Galactic Structure Compatible with Microlensing Data?The Astrophysical Journal, 2000
- The microlensing optical depth of the COBEbulgeMonthly Notices of the Royal Astronomical Society, 1997
- The MACHO Project: 45 Candidate Microlensing Events from the First Year Galactic Bulge DataThe Astrophysical Journal, 1997
- Photometric reconstruction and data analysis softwares in the EROS experimentVistas in Astronomy, 1996
- Morphology, near-infrared luminosity, and mass of the Galactic bulge from COBE DIRBE observationsThe Astrophysical Journal, 1995
- Understanding the kinematics of Galactic Centre gasMonthly Notices of the Royal Astronomical Society, 1991
- The universe at faint magnitudes. I - Models for the galaxy and the predicted star countsThe Astrophysical Journal Supplement Series, 1980