Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An XMM-Newton Observation of 4U1755-33 in Quiescence: Evidence for a
  Fossil X-Ray Jet   We report an XMM-Newton observation of the Low mass X-ray Binary (LMXB) and
black hole candidate 4U1755-33. This source had been a bright persistent source
for at least 25 yrs, but in 1995 entered an extended quiescent phase. 4U1755-33
was not detected with an upper limit to the 2-10 keV luminosity of 5.10^31
erg/s (assuming a distance of 4 kpc) - consistent with the luminosity of other
black hole candidates in a quiescent state. An unexpected result is the
discovery of a narrow 7' long X-ray jet-like feature centered on the position
of 4U1755-33. The spectrum of the jet is similar to that observed from other
galactic and extragalactic jets thought to be associated with accreting black
holes. The detection of a fossil jet provides additional evidence supporting
the black hole candidacy of 4U1755-33. The spectral properties of three bright
serendipitous sources in the field are reported and it is suggested these are
background active galactic nuclei (AGN).

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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas