Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198...95g&link_type=abstract
Astrophysical Journal, vol. 198, May 15, 1975, pt. 1, p. 95-101.
Astronomy and Astrophysics
Astrophysics
278
Astronomical Models, Interstellar Extinction, Interstellar Matter, Optical Measurement, X Ray Absorption, Absorptivity, Abundance, Cosmic Dust, Heavy Elements, Optical Properties, Photoelectric Emission, Photon-Electron Interaction, X Ray Sources, X Ray Spectra
Scientific paper
An empirical relation between interstellar X-ray absorption and optical extinction is derived from the correlation of measurements made on objects of large intrinsic diameter. The result is Av = 4.5 times 10 to the -22nd power N(H) mag, with the principal error being largely systematic in origin, where N(H) represents the column density of interstellar matter in the Brown and Gould model for the X-ray absorption coefficient. Applying this ratio to optically identified compact sources, it is concluded that sources in binary systems showing pronounced X-ray occultations have an intrinsic absorption equivalent to about 10 to the 22-nd power atoms per sq cm of interstellar matter and that there are a few compact sources where the absorption seems to be primarily interstellar in origin. The interstellar absorption expected in Cyg X-1 from the extinction of its optical counterpart is much greater than that suggested by X-ray spectra, which may be due to a soft X-ray component greater than that predicted by the power law fitted to higher energy data.
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