Shadowing of the extragalactic 0.25 keV background.

Details Shadowing of the extragalactic 0.25 keV background. Shadowing of the extragalactic 0.25 keV background.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..345w&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 345 - 346

Astronomy and Astrophysics

Astrophysics

1

X-Ray Background: Spiral Galaxies

Scientific paper

ROSAT observations are reported of the nearby spiral galaxy NGC 55. Several factors including this galaxy's close to edge-on aspect, its extensive H I disk and its location in a direction of relatively low Galactic foreground column density, make NGC 55 an excellent target for an investigation of shadowing effects in the extragalactic 0.25 keV background. The ROSAT PSPC image shows a clear deficit of 0.25 keV counts coincident with the outer disk of NGC 55. From the depth of the shadow the authors obtain an estimate of the total extragalactic background signal at 0.25 keV of 29±7 keV cm-2s-1sr-1keV-1.

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