Discovery of strong CIV absorption in the highest redshift quasar

Details Discovery of strong CIV absorption in the highest redshift quasar Discovery of strong CIV absorption in the highest redshift quasar

2001-04-09

arxiv.org/abs/astro-ph/0104147v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication in A&A Letters

Scientific paper

10.1051/0004-6361:20010523

We report the near-IR detection of a prominent CIV absorption in the rest-frame UV spectrum of the most distant known QSO, SDSS J104433.04-012502.2, at z=5.80. This QSO was recently observed with XMM-Newton and it was found to be notably X-ray weak. The equivalent width of the CIV absorption feature (~10 A) strongly supports the idea that the X-ray faintness of this QSO is due to heavy absorption by gas with a column density N_H > 10^{24} cm^-2. The shape of the CIV feature suggests that this is a Broad Absorption Line QSO. Although absorbed by a huge column of gas, the observed continuum in the 0.9-2.4um range (~1300-3500 A rest frame) exactly matches the template of unabsorbed QSOs without invoking any reddening (E(B-V)<0.08 mag), indicating that dust in the absorbing gas is either absent or composed of large grains.

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