X-ray emission from the most luminous z>4 Palomar Digital Sky Survey Quasars: the Chandra view

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dc.creatorVignali, C.
dc.creatorBrandt, W. N.
dc.creatorSchneider, D. P.
dc.creatorGarmire, G. P.
dc.creatorKaspi, S.
dc.date2002-09-30
dc.date.accessioned2026-07-07T02:05:29Z
dc.date.available2026-07-07T02:05:29Z
dc.descriptionWe present the results obtained from exploratory Chandra observations of nine high-redshift (z=4.09-4.51) quasars, selected from among the optically brightest Palomar Digital Sky Survey quasars known. Their broad-band spectral energy distributions are characterized, on average, by steeper alpha_ox values (<alpha_ox>=-1.81+/-0.03) than those of lower-redshift, lower-luminosity samples of quasars. We find a significant correlation between AB1450(1+z) magnitude and soft X-ray flux, suggesting that the engine powering the UV and X-ray emission is the same. The joint 2-30 keV rest-frame X-ray spectrum is well parameterized by a Gamma=2.0+/-0.2 power-law model with no evidence for intrinsic absorption (N_H<8.8 10^{21} cm^-2).
dc.description4 pages, 3 figures, Latex macro sprocl.sty, to be published in the proceedings of the 5th Italian AGN Meeting "Inflows, Outflows and Reprocessing around black holes" (2002)
dc.identifierhttps://arxiv.org/abs/astro-ph/0210001
dc.identifierhttp://arxiv.org/abs/astro-ph/0210001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5120
dc.subjectAstrophysics
dc.titleX-ray emission from the most luminous z>4 Palomar Digital Sky Survey Quasars: the Chandra view
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