Optical Depth from Realistic Microlensing Models of M31

Journal Article · Thu Jun 01 00:00:00 EDT 2000 · Astrophysical Journal

DOI:https://doi.org/10.1086/308896· OSTI ID:20217582

Gyuk, Geza; Crotts, Arlin

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. (c) 2000 The American Astronomical Society.

• OSTI ID: 20217582
• Journal Information: Astrophysical Journal, Vol. 535, Issue 2; Other Information: PBD: 1 Jun 2000; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
OPTICAL DEPTH CURVE
GRAVITATIONAL LENSES
MATHEMATICAL MODELS
INTERSTELLAR SPACE
EXPERIMENTAL DATA
THEORETICAL DATA