Optical Depth from Realistic Microlensing Models of M31

Details Optical Depth from Realistic Microlensing Models of M31 Optical Depth from Realistic Microlensing Models of M31

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...535..621g&link_type=abstract

The Astrophysical Journal, Volume 535, Issue 2, pp. 621-625.

Astronomy and Astrophysics

Astronomy

13

Cosmology: Dark Matter, Galaxies: Halos, Galaxies: Individual (M31), Cosmology: Gravitational Lensing

Scientific paper

We provide a set of microlensing optical depth maps for M31. Optical depths toward 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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