Soft X-ray shadowing by the Draco cloud

Details Soft X-ray shadowing by the Draco cloud Soft X-ray shadowing by the Draco cloud

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.351..629b&link_type=abstract

Nature (ISSN 0028-0836), vol. 351, June 20, 1991, p. 629-631.

Astronomy and Astrophysics

Astronomy

134

Background Radiation, Interstellar Matter, Molecular Clouds, X Ray Astronomy, Interstellar Gas, Rosat Mission, X Ray Spectra

Scientific paper

The Rosat astronomical satellite has detected shadowing of the X-ray background in the 0.25 keV band, which is of presumably galactic origin, by the interstellar cloud in Draco, which is at high galactic latitude and well away from the galactic plane. The cloud reduces the 0.25 keV emission by 63 percent relative to the adjacent sky, implying that a substantial contribution to the X-ray background in this direction comes from hot gas beyond the cloud. The results are interpreted as the first direct evidence for a 1,000,000-K galactic halo of gas, but is problematic, in contradicting previous studies which failed to establish the existence of shadowing by galactic gas.

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