The nature of the "Composite" Seyfert/Star-forming Galaxies

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dc.creatorPanessa, F.
dc.creatorCappi, M.
dc.creatorBassani, L.
dc.creatorDadina, M.
dc.creatorDella Ceca, R.
dc.creatorPellegrini, S.
dc.creatorTrincheri, G.
dc.creatorWolter, A.
dc.creatorPalumbo, G. G. C.
dc.date2002-12-13
dc.date2003-04-02
dc.date.accessioned2026-07-07T02:06:52Z
dc.date.available2026-07-07T02:06:52Z
dc.descriptionWe present the results obtained with BeppoSAX observations of the three Composite Seyfert/star-forming galaxies: IRAS 20051-1117, IRAS 04392-0123 and IRAS 01072+4954. These sources belong to an enigmatic class of X-ray sources detected in the ROSAT All-Sky Survey (Moran et al. 1996) which is composed of 6 low redshift galaxies. Their optical spectra are dominated by the features of HII galaxies while their X-ray luminosities (< 10^{42} ergs/s) are typical of Seyfert galaxies. IRAS 20051-1117 shows a 2-10 keV spectrum well described by a power-law with photon index = 1.9 and low intrinsic absorption. This result, the ratio Flux(2-10 keV)/Flux([OIII]) and the significant X-ray variability detected, clearly rule out a Compton thick nature of this source. IRAS 04392-0123 and IRAS 01072+4954, instead, have a BeppoSAX flux a factor of ~ 50-80 smaller than in the previous ROSAT observations, resulting in poor statistics, that prevents detailed modeling.
dc.description4 pages, 2 figures. To appear in "Carnegie Observatories Astrophysics Series, Vol. 1: Coevolution of Black Holes and Galaxies," ed. L. C. Ho (Pasadena: Carnegie Observatories, http://www.ociw.edu/ociw/symposia/series/symposium1/proceedings.html)
dc.identifierhttps://arxiv.org/abs/astro-ph/0212322
dc.identifierhttp://arxiv.org/abs/astro-ph/0212322
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5510
dc.subjectAstrophysics
dc.titleThe nature of the "Composite" Seyfert/Star-forming Galaxies
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