Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-17
Astronomy and Astrophysics
Astrophysics
23 pages, AJ, in press, also available at http://www.astro.psu.edu/users/niel/papers/papers.html
Scientific paper
10.1086/318760
We report on an XMM-Newton observation of the most distant known quasar, SDSSp J104433.04-012502.2, at z=5.80. We have detected this quasar with high significance in the rest-frame 3.4-13.6 keV band, making it the most distant cosmic object detected in X-rays; 32 +/- 9 counts were collected. SDSSp J104433.04-012502.2 is notably X-ray weak relative to other luminous, optically selected quasars, with alpha_ox=-1.91 +/- 0.05 and a 3.4-13.6 keV luminosity of about 1.8 x 10^{44} erg/s. The most likely reason for its X-ray weakness is heavy absorption with N_H greater than about 10^{24} 1/cm^2, as is seen in some Broad Absorption Line quasars and related objects; we discuss this and other possibilities. High-quality spectroscopy from 0.95-1.10 microns to search for blueshifted C IV absorption may elucidate the origin of the X-ray weakness.
Brandt Wiliam N.
Clavel Jean
Fan Xiaohui
Guainazzi Matteo
Gunn James E.
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