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

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

2002-09-30

arxiv.org/abs/astro-ph/0210001v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, Latex macro sprocl.sty, to be published in the proceedings of the 5th Italian AGN Meeting "Inflows, Outflo

Scientific paper

We 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 (=-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).

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