Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.186..211h&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 186, no. 2, Dec. 1991, p. 211-223.
Astronomy and Astrophysics
Astrophysics
8
Cosmic X Rays, Diffuse Radiation, Galactic Cosmic Rays, X Ray Sources, Absorption Cross Sections, Emission Spectra, Interstellar Gas, Radiative Transfer
Scientific paper
This study presents a new model for the source distribution of galactic soft X-ray (B and C band) emission. From the mean dependence of count rates on galactic latitude b, the soft X-ray source function Q is derived as a function of the optical depth tau by solving the equation of radiative transfer with the aid of a Laplace transform. Contrary to other models, Q is found to increase strongly, but not abruptly, in the optical depth range of 1.5 and 2.5, indicating a noticeable emission of X-rays from beyond the H I scale height. X-ray absorption cross sections for the interstellar medium are used to determine that the B band X-ray emission coefficient is nonzero within the H I disk and has a maximum at a z-value slightly above the H I scale height. In the C band, the emission coefficient decreases slightly with increasing z, at least up to the H I scale height. It is inferred from the nonzero source function near the galactic plane that the ISM within the H I scale height is not only an absorbing layer but is mixed with X-ray-emitting regions.
Dahlem Michael
Hirth W.
Mebold Ulrich
Mueller Peter
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