Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l..87s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Oct. 15, 1977, p. L87-L91.
Astronomy and Astrophysics
Astronomy
97
Background Radiation, Cosmic Gases, Extraterrestrial Radiation, Hydrogen Atoms, Interstellar Matter, X Ray Astronomy, C Band, Diffuse Radiation, Galactic Structure, Gas Density, Intergalactic Media, Southern Hemisphere
Scientific paper
A map is presented of the soft X-ray diffuse background flux in the C band (approximately 0.13-0.28 keV) covering almost all of the southern galactic hemisphere. A comparison at constant galactic latitude of both C band and B band (about 0.1-0.18 keV) soft X-ray data with neutral-hydrogen maps shows that the intensity does decrease with increasing neutral-hydrogen column density but in a manner that is inconsistent with photoelectric absorption. It is suggested that the inverse correlation is a displacement effect. X-ray emission regions appear to be where the cool gas is not. Further, the evidence against photoelectric absorption implies that the bulk of the cool gas is beyond the X-ray emitting regions. Fewer than 10 to the 20th power H atoms per sq cm can be between the sun and the X-ray emitting regions. The sun appears to be surrounded by a soft X-ray emission region consisting of gas at a temperature of about 1 million K.
Fried P. M.
Kraushaar William L.
Nousek John A.
Sanders Wilton T.
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