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The Ratio of Total to Selective Extinction Toward Baade's Window
Andrew Gould, Amelia Stutz, Jay A. Frogel
We measure the ratio of total to selective extinction, R_{VI}=A_V/E(V-I), toward Baade's Window by comparing the VIK colors of 132 Baade's Window G and K giants from Tiede, Frogel,…
A Cluster of Black Holes at the Galactic Center
Jordi Miralda-Escude, Andrew Gould
If the stellar population of the bulge contains black holes formed in the final core collapse of ordinary stars with M \ga 30 M_{\odot}, then about 25,000 stellar mass black holes…
A Natural Formalism for Microlensing
Andrew Gould
If the standard microlensing geometry is inverted so that the Einstein ring is projected onto the observer plane rather than the source plane, then the relations between the observ…
Superluminal Caustics of Close, Rapidly-Rotating Binary Microlenses
Zheng Zheng, Andrew Gould
The two outer triangular caustics (regions of infinite magnification) of a close binary microlens move much faster than the components of the binary themselves, and can even exceed…
Astrometric Resolution of Severely Degenerate Binary Microlensing Events
Andrew Gould, Cheongho Han
We investigate whether the "close/wide" class of degeneracies in caustic-crossing binary microlensing events can be broken astrometrically. Dominik showed that these degeneracies a…