Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Identifying X-ray Sources in Bulge and Disk Galaxies from X-ray Colors   The X-ray populations of Local group galaxies have been classified in detail
by Einstein, ROSAT and ASCA revealing a mix of binaries, supernova remnants and
HII regions. However, these observatories were unable to resolve X-ray sources
in galaxies beyond the local group. With Chandra's exquisite spatial resolution
we are able to resolve sources in a sample of nearby galaxies. We show that
there are highly significant differences in the X-ray colors of sources in
bulge and disk systems. These differences can be used as a basis to classify
sources as low and high mass X-ray binaries, supernova remnants and supersoft
sources. While it is impossible to identify any individual source on the basis
of X-ray color alone, the observations presented here suggest that it is
possible to separate sources into groups dominated by a single type of source.
This classification scheme is likely to be very useful in population studies,
where it is crucial to distinguish between different classes of objects.

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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph