Soft X-ray properties of a complete sample of QSOs

Details Soft X-ray properties of a complete sample of QSOs Soft X-ray properties of a complete sample of QSOs

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001basi...29..413d&link_type=abstract

Bulletin of the Astronomical Society of India, Vol. 29, p. 413-415

Astronomy and Astrophysics

Astronomy

Galaxies: Active, Galaxies: Nuclei, X-Rays: Galaxies

Scientific paper

In order to study systematically the soft X-ray emission of AGNs, we have analyzed ROSAT PSPC spectra of 22 QSOs. The QSOs form a complete sample with soft X-ray flux ??1.4 x 10-14 erg cm-2 s-1 in the energy band of 0.1-2.0 keV in a circular region of radius 15 arcmin in the sky. The highest redshift QSO in the sample has z = 3.4. The average photon index (?) of the QSOs is 2.39 with a dispersion of 0.57. There are only 3 QSOs with ?x ??3.0. The average slope of the soft X-ray spectra of the QSOs flattens at higher redshifts. Only three out of 22 QSOs show the presence of a significant excess absorption over the Galactic value.

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