Soft diffuse X-rays in the southern galactic hemisphere

Singh, K. P. ; Manchanda, R. K. ; Iyengar, V. S. ; Naranan, S. ; Sreekantan, B. V. (1977) Soft diffuse X-rays in the southern galactic hemisphere The Astrophysical Journal, 217 (2). L87-L91. ISSN 0004-637X

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A map is presented of the soft X-ray diffuse background flux in the C band (~ 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 (~ 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, NH, but in a manner that is inconsistent with photoelectric absorption. We suggest 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 20 H atoms cm-2 can be between the Sun and the X-ray emitting regions. The Sun appears to be surrounded by a soft X-ray emission region of ~ million degree gas.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
ID Code:76759
Deposited On:05 Jan 2012 15:38
Last Modified:18 May 2016 20:19

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