Limits on the density of neutral gas within 100 parsecs from observations of the soft X-ray background

Details Limits on the density of neutral gas within 100 parsecs from observations of the soft X-ray background Limits on the density of neutral gas within 100 parsecs from observations of the soft X-ray background

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367..182j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 182-185.

Astronomy and Astrophysics

Astronomy

36

Background Radiation, Gas Density, Interstellar Matter, Neutral Gases, Spectral Bands, X Ray Astronomy, Absorption Cross Sections, Plasma Temperature, Solar Radiation

Scientific paper

Observations are presented in two soft X-ray bands, the Be band (0.077-0.111 keV) and the B-prime (0.105-0.188 keV), for nine directions in the sky. The ratio of count rates in these two bands remains constant as the rates vary by a factor of three, even though the effective interstellar absorption cross sections in the bands differ by a factor of about 3.5. For a model in which the bulk of the observed soft X-ray emission originates in a uniform low-density region surrounding the sun, the constant ratio between the band rates places an upper limit on the amount of neutral material that can be homogeneously mixed with the X-ray-emitting gas. The 2 sigma upper limit on the H I column density over an average path through the local emitting region is 6.6 x 10 to the 18th/sq cm. If the average path length is about 100 pc, then clouds similar to the one in which the sun is embedded could still have a filling factor as large as 25 percent.

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