Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.4814c&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #48.14; Bulletin of the American Astronomical Society, Vol. 26, p.940
Astronomy and Astrophysics
Astronomy
Scientific paper
We have analyzed ROSAT observations of several nearby face-on spiral galaxies and find significant unresolved X-ray emission in 0.1-2 keV energy band. In all galaxies, the emission is strong at the center and becomes fainter toward the outer edge. In the 0.1-0.4 keV energy band, there is an apparent deficiency in X-ray surface brightness around the outer edges of the galaxies. This can be interpreted as absorption of extragalactic X-ray emission by interstellar matter in the galaxies, thus providing an interesting lower limit on the cosmic X-ray background at these energies.
Cui Wei-Wei
McCammon Dan
Sanders Wilton T.
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