Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resolving Microlensing Events with Triggered VLBI   Microlensing events provide a unique capacity to study the stellar remnant
population of the Galaxy. Optical microlensing suffers from a near complete
degeneracy between the mass, the velocity and the distance. However, a
subpopulation of lensed stars, Mira variable stars, are also radio bright,
exhibiting strong SiO masers. These are sufficiently bright and compact to
permit direct imaging using existing very long baseline interferometers such as
the Very Long Baseline Array (VLBA). We show that these events are relatively
common, occurring at a rate of $\approx 2~{\rm yr^{\ -1}}$ of which $0.1~{\rm
yr^{-1}}$ are associated with Galactic black holes. Features in the associated
images, e.g., the Einstein ring, are sufficiently well resolved to fully
reconstruct the lens properties, enabling the measurement of mass, distance,
and tangential velocity of the lensing object to a precision better than 15%.
Future radio microlensing surveys conducted with upcoming radio telescopes
combined with modest improvements in the VLBA could increase the rate of
Galactic black hole events to roughly 10~${\rm yr}^{-1}$, sufficient to double
the number of known stellar mass black holes in a couple years, and permitting
the construction of distribution functions of stellar mass black hole
properties.

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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph