1998/09/07 by C. Vignali, A. Comastri, Vignali, C. +7
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9809076
4 pages, 3 figures, Latex macros memsait.sty, epsfig.sty, epsf.tex, to be pubblished in the proceedings of the conference "Dal nano- al Tera-eV: tutti i colori degli AGN", third Italian conference on AGNs, Roma, 18-21 May 1998, Memorie S.A.It
arxiv created 1998/09/07 · arxiv updated 2009/12/01
Here we report the X-ray spectral analysis of 5 high-redshift (z ≥ 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, < Γ> = 1.68±0.09 (dispersion σ∼ 0.11), places the high-z objects of the present sample in the lower-Γtail of the RQQs spectral indices distribution.