Soft X-ray properties of a complete sample of QSOs

dc.contributor.author	Dewangan, G. C
dc.contributor.author	Singh, K. P
dc.date.accessioned	2008-05-13T09:27:51Z
dc.date.available	2008-05-13T09:27:51Z
dc.date.issued	2001
dc.identifier.citation	BASI, Vol. 29, No. 3, pp. 413 - 415	en
dc.identifier.uri	http://hdl.handle.net/2248/2293
dc.description.abstract	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.	en
dc.format.extent	239442 bytes
dc.format.mimetype	application/pdf
dc.language.iso	en	en
dc.publisher	Astronomical Society of India	en
dc.relation.uri	http://adsabs.harvard.edu/abs/2001BASI...29..413D	en
dc.subject	Galaxies:active	en
dc.subject	Galaxies:nuclei	en
dc.subject	X-rays:galaxies	en
dc.title	Soft X-ray properties of a complete sample of QSOs	en
dc.type	Article	en