Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...252.1529s&link_type=abstract
Science (ISSN 0036-8075), vol. 252, June 14, 1991, p. 1529-1532. Max-Planck-Institut für extraterrestrische Physik-supported res
Physics
114
Diffuse Radiation, H I Regions, Molecular Clouds, Nebulae, Shadows, X Ray Telescopes, Galactic Structure, Rosat Mission, X Ray Irradiation
Scientific paper
The detection by the Roentgen satellite (ROSAT) X-ray telescope of a shadow in the 1/4-keV (C-band, 0.1 to 0.284 keV) cosmic diffuse background is reported. The location and morphology of the local minimum in X-rays are in clear agreement with a discrete H I cloud. The shadow is very deep with a minimum level at 50 percent of the surrounding emission; therefore, a minimum of 50 percent of the observed off-cloud flux must originate on the far side of the cloud. The analysis of H I velocity components links the cloud with the Draco nebula (distance of about 600 parsecs); it then follows that there is significant 1/4-keV X-ray emission at large distance (more than 400 parsecs) from the galactic plane along this line of sight. The extent of the distant emission region is uncertain, and if it indicates the existence of a hot galactic corona, it must be patchy in nature.
Herbstmeier Uwe
Hirth W.
Mebold Ulrich
Schmitt Juergen H. M. M.
Snowden Steve L.
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