Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BeppoSAX unveils the nuclear component in NGC 6240   The direct nuclear X-ray emission of the ultraluminous IRAS galaxy NGC 6240
has been observed for the first time by BeppoSAX. It is seen through an
absorber with N_H=2*10^{24} cm^{-2}. The 2-10 keV X-ray luminosity >10^{44} erg
s^{-1} definitely proves that a powerful AGN is hosted in this galaxy, despite
the LINER optical appearance. Assuming the typical L_X/L_bol ratio for quasars,
our result implies that it is the AGN and not the starburst that dominates the
energy output of NGC 6240.

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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
2
The categories of this paper are: math
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: nlin