X-ray properties of the quasar HE0450-2958

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dc.creatorZhou, Xin-Lin
dc.creatorYang, Fang
dc.creatorLv, Xiao-Rong
dc.creatorWang, Jian-Min
dc.date2006-11-20
dc.date.accessioned2026-07-07T11:20:43Z
dc.date.available2026-07-07T11:20:43Z
dc.descriptionWe present an {\it XMM-Newton} EPIC observation of HE0450-2958 which may be a ``naked''quasar as suggested by Magain et al. The \xmm EPIC spectra show a substantial soft X-ray excess, a steep photon index, as well as marginal evidence for a weak Fe K$α$ line. The X-ray absorption is consistent with the galactic level. The 0.3-10 keV EPIC spectra can be fitted by a power law plus a blackbody model, however, the fit by the relativistically blurred photoionized disc reflection is better. We estimate the black hole mass of $2^{+7}_{-1.3} \times 10^{7} M_{\odot}$ from the X-ray variability. This broadly agrees with the value derived from the optical \hb line width. These results support a high-state Seyfert galaxy of the source. HE0450-2958 shares similar properties of transitionary objects from ultra-luminous infrared galaxies to quasars. We suggest that HE0450-2958 is just in the beginning of an optical quasar window.
dc.description23 pages, 8 figures, AJ in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0611629
dc.identifierhttp://arxiv.org/abs/astro-ph/0611629
dc.identifierAstron.J.133:432-438,2007
dc.identifierdoi:10.1086/510152
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194046
dc.subjectAstrophysics
dc.titleX-ray properties of the quasar HE0450-2958
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