Is Galactic Structure Compatible with Microlensing Data?

Details Is Galactic Structure Compatible with Microlensing Data? Is Galactic Structure Compatible with Microlensing Data?

2000-03-22

arxiv.org/abs/astro-ph/0003330v2

Astronomy and Astrophysics

Astrophysics

Submitted to ApJ Letters. 8 pages LaTeX, 3 figures. Corrected error in description of microlensing observations

Scientific paper

10.1086/312767

We generalize to elliptical models the argument of Kuijken (1997), which connects the microlensing optical depth towards the Galactic bulge to the Galactic rotation curve. When applied to the latest value from the MACHO collaboration for the optical depth for microlensing of bulge sources, the argument implies that the Galactic bar cannot plausibly reconcile the measured values of the optical depth, the rotation curve and the local mass density. Either there is a problem with the interpretation of the microlensing data, or our line of sight to the Galactic centre is highly atypical in that it passes through a massive structure that wraps only a small distance around the Galactic centre.

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