Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241....1s&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Oct. 1, 1980, p. 1-24.
Astronomy and Astrophysics
Astrophysics
25
Astronomical Spectroscopy, Quasars, X Ray Absorption, Absorption Spectra, Intergalactic Media, Missing Mass (Astrophysics), Opacity, Spectral Bands, Spectral Energy Distribution
Scientific paper
The X-ray absorption spectrum above 0.1 keV that would be introduced into the continuous X-ray spectrum of a quasar by an intervening uniform, hot intergalactic gas with a small admixture of atoms of C, N, O, Ne, Mg, Si, S and Fe has been calculated in detail. This work is relevant to the well-known search for cosmologically distributed missing mass. The results indicate that soft X-ray absorption can be appreciable for all quasar X-ray sources, from the most distant to the very nearby, for a significant range of IGM temperatures, densities, heavy-element abundances, and observed photon energies. A brief comparison with the preliminary results of the Einstein Observatory quasar sample is made. The possibility that gas 'clumped' on noncosmological scales produces observable absorption lines and/or edges in quasar X-ray spectra is also considered.
Bahcall John N.
Shapiro Paul R.
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