On the peculiar X-ray properties of the bright nearby radio-quiet quasar PDS456

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dc.creatorVignali, C.
dc.creatorComastri, A.
dc.creatorNicastro, F.
dc.creatorMatt, G.
dc.creatorFiore, F.
dc.creatorPalumbo, G. G. C.
dc.date2000-08-04
dc.date.accessioned2026-07-07T01:54:41Z
dc.date.available2026-07-07T01:54:41Z
dc.descriptionBeppoSAX and ASCA observations of the nearby (z=0.184), high-luminosity, radio-quiet quasar PDS456 are presented. The X-ray spectrum is characterized by a prominent ionized edge at 8-9 keV (originally discovered by RXTE, Reeves et al. 2000) and by a soft excess below 1.5 keV. The lack of any significant iron K alpha emission line suggests for the edge an origin from line-of-sight material rather than from reflection from a highly ionized accretion disc. The hard X-ray continuum is indeed well modelled by transmission through a highly-ionized medium with a large column density (N_H warm = 4.5 x 10^24 cm^-2) plus an additional cold absorber with a lower column density (N_H cold = 2.7 x 10^22 cm^-2).
dc.description7 pages, 5 figures, accepted by Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/0008090
dc.identifierhttp://arxiv.org/abs/astro-ph/0008090
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1444
dc.subjectAstrophysics
dc.titleOn the peculiar X-ray properties of the bright nearby radio-quiet quasar PDS456
dc.typetext

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