First ASCA results for high-redshift Radio-Quiet Quasars

Details First ASCA results for high-redshift Radio-Quiet Quasars First ASCA results for high-redshift Radio-Quiet Quasars

1998-09-07

arxiv.org/abs/astro-ph/9809076v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, Latex macros memsait.sty, epsfig.sty, epsf.tex, to be pubblished in the proceedings of the conference "Dal

Scientific paper

Here we report the X-ray spectral analysis of 5 high-redshift ($z \geq 2$) radio-quiet quasars (RQQs) observed with the ASCA satellite. A simple power law with Galactic absorption model well fits the data. There is no evidence of a reflection component. The average spectral slope in the observed 0.5--10 keV energy range, $< \Gamma > = 1.68\pm{0.09}$ (dispersion $\sigma \sim 0.11$), places the high-z objects of the present sample in the lower-\Gamma tail of the RQQs spectral indices distribution.

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