Effects of Galactic absorption on soft X-ray surveys

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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.

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