Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.393c&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present X-ray observations of gravitationally lensed quasars with redshifts ranging between 1 and 4. We have constructed simple GL models for our sample and computed their expected magnification factors. The large magnification factors of GL systems allow us to investigate the properties of quasars with X-ray luminosities that are substantially lower than those of unlensed ones and also allow us to determine their contribution to the X-ray background. Our preliminary results indicate a flattening of the spectral index in the hard X-ray band for GL radio loud quasars and we find that the average spectral indices of our GL sample are not harder than those of bright unlensed quasars suggesting that faint quasars do not contribute significantly to the X-ray background. We also present future extensions of this work made possible with the upcoming AXAF observations of several GL quasars.
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