Expectations from Realistic Microlensing Models of M31. I: Optical Depth

Details Expectations from Realistic Microlensing Models of M31. I: Optical Depth Expectations from Realistic Microlensing Models of M31. I: Optical Depth

1999-04-22

arxiv.org/abs/astro-ph/9904314v2

Astronomy and Astrophysics

Astrophysics

4 pages 4 figures, submitted to ApJL, corrected figure typo

Scientific paper

We provide a set of microlensing optical depth maps for M31. Optical depths towards Andromeda were calculated on the basis of a four component model of the lens and source populations: disk and bulge sources lensed by bulge, M31 halo and Galactic halo lenses. We confirm the high optical depth and the strong optical depth gradient along the M31 minor axis due to a dark halo of lenses and also discuss the magnitude of the self-lensing due to the bulge. We explore how the shape of the optical depth maps to M31 vary with the halo parameters core radius and flattening.

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