Stellar Contribution to the Galactic Bulge Microlensing Optical Depth

Details Stellar Contribution to the Galactic Bulge Microlensing Optical Depth Stellar Contribution to the Galactic Bulge Microlensing Optical Depth

2003-03-13

arxiv.org/abs/astro-ph/0303309v1

Astrophys.J. 592 (2003) 172-175

Astronomy and Astrophysics

Astrophysics

10 pages, including 1 figure. Submitted to ApJ

Scientific paper

10.1086/375706

We estimate the optical depth to self-lensing by stars in the Galactic bulge using the HST star counts of Holtzman et al and Zoccali et al as extrapolated by Gould into the brown-dwarf and remnant regimes and deprojected along the line of sight using the model of Dwek et al. We find a self-lensing optical depth tau(bulge-bulge)=0.98 x 10^{-6}. When combined with the lensing of bulge stars by foreground stars in the disk, this yields tau(bulge-total)=1.63 x 10^{-6}, in reasonable agreement with the estimates of tau=2.13 +/- 0.40 x 10^{-6} and tau=1.08 +/- 0.30 x 10^{-6} based on observations of clump giants by the MACHO and EROS collaborations.

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