A simulation study predicts X-ray microlensing of Andromeda sources by halo white dwarfs at 2.6 to 6.3 events per year, but the proposed measurement of black hole spin and disk temperature from the light curve shape is not demonstrated.
The Optical Depth to Gravitational Microlensing in the Direction of the Galactic Bulge
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abstract
We present the analysis of the first two years of the OGLE search for gravitational lenses towards the Galactic bulge. We detected 9 microlensing events in an algorithmic search of $ \sim 10^8 $ measurements of $ \sim 10^6 $ stars. The characteristic time scales are in the range $ 8.6 < t_0 < 62 $ days, where $ t_0 = R_E / V $. The distribution of amplitudes is consistent with theoretical expectation. The stars seem to be drawn at random from the overall distribution of the observed bulge stars. We find that the optical depth to microlensing is larger than $ ( 3.3 \pm 1.2 ) \times 10^{-6}$, in excess of current theoretical estimates.
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Using white dwarf lensing to resolve accretion flows
A simulation study predicts X-ray microlensing of Andromeda sources by halo white dwarfs at 2.6 to 6.3 events per year, but the proposed measurement of black hole spin and disk temperature from the light curve shape is not demonstrated.