Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377l..85w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. L85-L88.
Astronomy and Astrophysics
Astrophysics
14
Galactic Radiation, Halos, Interstellar Matter, Magellanic Clouds, X Rays, Brightness Distribution, Diffuse Radiation, High Temperature Gases, Proportional Counters
Scientific paper
The detection of diffuse X-ray emission from the vicinity of the SMC is reported. The diffuse emission constitutes about 60 percent of the total observed X-ray flux in a 0.16-3.5 keV band from a field mapped out with the Einstein imaging proportional counter, and extends beyond the active main body of the galaxy, suggesting substantial emission from the galaxy's halo. The emission spectrum, getting soft away from the main body, is consistent with a picture in which hot gas, created in recent star formation regions, cools off on the way out into the halo. While the total observed luminosity of the diffuse X-rays is only 10 exp 38.7 ergs/s in the 0.16-3.5 keV band, the low temperature of the X-ray-emitting gas implies that its total cooling rate could be sufficient in balancing the supernova heating in the galaxy. A general scenario is described for the dynamic and thermal evolution of hot gas blowing out from the disk plane into the halo of a galaxy.
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