Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The X-ray-Resolved Supernova Remnant S8 in the Dwarf Irregular Galaxy IC
  1613   We conducted an observation of the nearby irregular galaxy IC 1613 with the
Chandra X-ray Observatory using the S3 chip of the ACIS with an effective
exposure time of 49.9 ksec. The observation primarily targeted the extensive
bubble and star formation region in the northeast quadrant of the galaxy. The
only known supernova remnant (SNR) in IC 1613, S8, is also the galaxy's most
luminous X-ray source (L_X (0.3-8 keV) ~5-6x10^{36} erg/s). We resolve the SNR
with Chandra and compare its nearly circular X-ray morphology with Halpha and
radio images. We assign an upper limit on the luminosity of any possible
associated compact central object of ~4x10^{35}$ erg/s (0.3-8 keV band) and
conclude that we would detect a Crab-like pulsar but not a Cas A-like object.
We infer an age for S8 of ~3400-5600 years and compare it to other SNRs in the
Local Group. We suggest that S8 is a young composite SNR.

7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin