Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BeppoSAX Observation of the NGC 3079 Nucleus   Using the BeppoSAX observatory, we have observed a nearby LINER/Seyfert 2
galaxy, NGC 3079, which is known as an outflow galaxy and a bright H_2O-maser
source. Using the PDS detector, we have revealed that the NGC 3079 nucleus
suffers from a Compton-thick absorption, with a hydrogen column density \sim
10^{25} cm^{-2}. After corrected the absorption, the 2--10 keV luminosity
becomes 10^{42-43} erg s^{-1} at a distance of 16 Mpc. It is 2-3 orders of
magnitude higher than that observed in the MECS band (below 10 kev). We also
detected a strong Fe-K line at 6.4^{+0.3}_{-0.2} keV with an equivalent width
of 2.4^{+2.9}_{-1.5} keV, which is consistent with the heavy absorption.

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The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
18
The categories of this paper are: econ