Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mkn 463 field observed by BeppoSAX   In this work we present the observation of the Mkn 463 field performed with
the MECS instrument on-board BeppoSAX in the 1.8-10.5 keV band. The Mkn 463
field is an example of an extragalactic field crowded with absorbed X-ray
sources: apart from the Seyfert 2 galaxy Mkn 463 and the well known QSO PG
1352+183 (the only object showing no absorption), two other objects are
detected with a column density in excess to the galactic value. The first 1SAX
J1353.9+1820 is a red QSO from the BeppoSAX High Energy Large Area Survey
(HELLAS). The second 1SAX J1355.4+1815 is optically unidentified, but its X-ray
spectral characteristics indicate that it too is an AGN hidden behind a large
column density.

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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
2
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: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph