Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BeppoSAX uncovers a type-2 QSO in the hyperluminous infrared galaxy IRAS
  09104+4109   We studied with BeppoSAX the infrared luminous galaxy IRAS 09104+4109 over a
very wide X-ray band from 0.1 to 80 keV. Our observations indicate the
dominance of a thermal component at energies below 8 keV, which we attribute to
the free-free emission from the intracluster (IC) plasma surrounding the
source. Above 10 keV we find evidence for the existence of flux in excess with
respect to the free-free IC plasma emission. This, together with the marginal
detection of a neutral iron line at $\sim 6.4$ keV, gives a strong indication
for the presence of an AGN deeply buried within the source. This component is
best modelled by a strongly absorbed (N_H > 5 10^{24} cm^{-2}) power-law plus
unabsorbed reflection spectrum (0.15<R<0.3), which is also responsible for the
cold iron line. The unabsorbed broad-band (2-100 keV) X-ray emission of this
AGN is 2.5 10$^{46} erg/s, well within the range of quasar luminosities. Our
results indicate that IRAS 09104+4109 is indeed the prototype of a rare class
of sources, the luminous type-2 QSOs. The association of this source with a
huge cooling-flow of $\sim 1000 M_\odot$ in the cluster, as indicated by the
X-ray data, might suggest that such condition of extremely fast mass
accumulation could favour the survival of a thick obscuring envelope, which
would otherwise be quickly destroyed by the very luminous central source.

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The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
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The categories of this paper are: supr-con
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph