X-Ray Study of the Distant QSO PKS 0237-233 with ASCA and ROSAT

Details X-Ray Study of the Distant QSO PKS 0237-233 with ASCA and ROSAT X-Ray Study of the Distant QSO PKS 0237-233 with ASCA and ROSAT

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50...19y&link_type=abstract

Publications of the Astronomical Society of Japan, v.50, p.19-24.

Astronomy and Astrophysics

Astronomy

2

Galaxies: Intergalactic Medium, Quasars, X-Rays: Sources

Scientific paper

The X-ray spectrum of the distant QSO PKS 0237-233 (z=2.223) has been studied with ASCA and ROSAT. The spectrum in the energy range 0.1 keV to 8 keV in the observer's frame is well fitted by a power-law model with a photon index of 1.54+/-0.06 absorbed by the galactic interstellar matter. The lack of excess absorption confirms that such absorption is not a universal property of the high-redshift GHz-peaked spectrum (GPS) sources. From a comparison of the Lyman alpha and the metal absorption lines in the optical and UV bands, small amount of X-ray absorption constrains the ionization state of the metal line system at z=1.65 as [H I/H]>2.5\times 10^{-4} and [C IV/C]>0.11 if the metal line systems have a metal abundance of 0.1ZO .

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