Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The XMM-Newton spectrum of the high-z optically-obscured QSO RX
  J1343.4+0001: a classic radio quiet QSO   We present a 30 ks XMM-Newton observation of the z = 2.35 Type II radio quiet
quasar RX J1343.4+0001. These data provide the first good quality X-ray
spectrum for this object. We measured a continuum slope Gamma = 1.85+/-0.10
with only an upper limit on the column density of the absorbing material of
Nh(z) <~ 10^22 cm^-2 as well as an Fe Kalpha emission line at the 3 sigma
confidence level. We do not find therefore a highly absorbed object nor a truly
flat spectrum as suggested on the basis of previous less sensitive ROSAT and
ASCA measurements. The Nh(z) upper limit is fully consistent with the optical
extinction 3 <A_V <10 inferred from IR observations. The Fe Kalpha line is
consistent with fluorescence from neutral iron and, noteworthy, is one of the
most distant observed so far. The X-ray spectral properties of RX J1343.4+0001
agree well with the steep continuum slope (Gamma ~ 1.9) being independent of
increasing redshift and luminosity as inferred by X-ray studies of large
samples of RQ QSOs.

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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex