The soft X-ray diffuse background and the structure of the local interstellar medium

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Cosmic Plasma, Diffuse Radiation, Interstellar Matter, X Ray Sources, Absorption Spectra, Astronomical Maps, Astronomical Models, Lyman Alpha Radiation, Microwave Frequencies, Neutral Gases, Proportional Counters, Sky Surveys (Astronomy)

Scientific paper

Data from five rocket flights of the Wisconsin soft X-ray sky survey, covering the southern galactic hemisphere with 6.5 deg spatial resolution between 0.1 and 2.0 keV, are presented as intensity maps. Analysis of the data in two energy bands below 0.3 keV is presented here. These low-energy X-rays appear to be emitted from a plasma of about one-million K, the bulk of which is closer to the sun than even the nearest 5 x 10 to the 19th/sq cm of neutral gas. No evidence is found for the presence of nearby small (radius of about 0.6 pc) clouds of cool neutral gas, as has been proposed by McKee and Ostriker (1977). The X-ray measurements are consistent with the small amounts of local neutral material inferred from Lyman-alpha absorption measurements.

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