Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196...39z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. 39-43.
Astronomy and Astrophysics
Astrophysics
18
Interstellar Extinction, Spectral Energy Distribution, X Ray Absorption, X Ray Sources, X Ray Spectra, Active Galactic Nuclei, Photoabsorption, X Ray Telescopes
Scientific paper
A bias in the spectral distribution of X-ray sources detected in X-ray surveys is discussed which is due to the combination of the intrinsic characteristics of X-ray telescopes and the effects of low-energy photoelectric absorption within the Galaxy. A statistical method for obtaining information on the average spectrum of X-ray sources detected in well-defined surveys is presented. This method can be applied to surveys performed with X-ray telescopes working at relatively soft X-ray energies, such as Einstein, Exosat, and Rosat.
Gioia Isabella Maria
Maccacaro Tomasso
Wolter Anna
Zamorani Gianni
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