Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The XMM-Newton Serendipitous Survey. II. First results from the AXIS
  high galactic latitude medium sensitivity survey   We present the first results on the identifications of a medium sensitivity
survey (X-ray flux limit 2E-14 erg/cm2/s in the 0.5-4.5 keV band) at high
galactic latitude (|b|>20 deg) carried out with the XMM-Newton X-ray
observatory within the AXIS observing programme. This study is being conducted
as part of the XMM-Newton Survey Science Centre activities towards the
identification of the sources in the X-ray serendipitous sky survey. The sample
contains 29 X-ray sources in a solid angle of 0.26deg2 (source density 113 +/-
21 sources/deg2), out of which 27 (93%) have been identified. The majority of
the sources are broad-line AGN (19), followed by narrow emission line X-ray
emitting galaxies (6, all of which turn out to be AGN), 1 nearby non-emission
line galaxy (NGC 4291) and 1 active coronal star. Among the identified sources
we find 2 broad-absorption line QSOs (z~1.8 and z~1.9), which constitute ~10%
of the AGN population at this flux level, similar to optically selected
samples. Identifications of a further 10 X-ray sources fainter than our survey
limit are also presented.

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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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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: econ
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat