BeppoSAX uncovers a type-2 QSO in the hyperluminous infrared galaxy IRAS 09104+4109

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dc.creatorFranceschini, A.
dc.creatorBassani, L.
dc.creatorCappi, L.
dc.creatorGranato, G. L.
dc.creatorMalaguti, G.
dc.creatorPalazzi, E.
dc.creatorPersic, M.
dc.date1999-12-07
dc.date.accessioned2026-07-07T02:34:49Z
dc.date.available2026-07-07T02:34:49Z
dc.descriptionWe 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.
dc.description7 pages, 5 fugures, accepted for publication in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9912127
dc.identifierhttp://arxiv.org/abs/astro-ph/9912127
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15396
dc.subjectAstrophysics
dc.titleBeppoSAX uncovers a type-2 QSO in the hyperluminous infrared galaxy IRAS 09104+4109
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