Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Results from a Survey of Gravitational Microlensing towards M31   We describe the results of a search for microlensing events affecting stars
in the outer bulge and inner disk of M31, due both to masses in M31 and the
Galaxy. These observations, from 1994 and 1995 on the Vatican Advanced
Technology Telescope and KPNO 4m, are sufficient to rule out masses in the
range of ~0.003 M_sol to 0.08 M_sol as the primary consistuents of the mass of
M31 towards this field. Furthermore we find six candidate events consistent
with microlensing due to masses of about 1 M_sol, but we suspect that some of
these may be cases where long-period red supergiant variables may be mistaken
for microlensing events. Coverage from anticipated data should be helpful in
determining if these sources maintain a constant baseline, and therefore are
best described by microlensing events.

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The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom