Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chandra observations of the nearby spiral galaxy NGC6503   We have observed the nearby spiral galaxy NGC6503 using Chandra. Seven
discrete sources associated with the galaxy have been found, one of them
coincident with its Liner-starburst nucleus. One of the sources corresponds to
a ULX with Lx >~ 10e39 ergs/s. Previous ROSAT observations of the galaxy show
that this source has varied by at least a factor 3 in the last 6 years. No
evidence is found for strong diffuse emission in the nuclear region or the
presence of a low luminosity AGN.

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The categories of this paper are: cs
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
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The categories of this paper are: math
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat