Direct evidence for a two component spectrum of the soft X-ray background

Details Direct evidence for a two component spectrum of the soft X-ray background Direct evidence for a two component spectrum of the soft X-ray background

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..597k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 2, p. 597-603

Astronomy and Astrophysics

Astronomy

18

Background Radiation, Diffuse Radiation, Hydrogen Clouds, Interstellar Matter, X Ray Astronomy, X Ray Spectra, Absorption Cross Sections, Cosmic Plasma, Emissivity, H I Regions, Rosat Mission, Temperature Distribution

Scientific paper

Two pointed ROSAT observations of neutral hydrogen clouds located at very different distances in the general direction of the Draco nebula are presented. These observations offer a unique possibility to study the temperature distribution of the soft X-ray background (SXRB) in detail. The observed anticorrelation of the H I column densities and the soft X-ray count rates is in quantitative agreement with the theoretical absorption cross section of the interstellar matter. Furthermore, soft X-ray spectra give direct evidence for the existence of a two component spectrum of the SXRB. Fits to the X-ray spectra are in agreement with a model consisting of a cooler (Tlocal approximately equal to 105.58 +/- 0.1 K) local X-ray emitting plamsa in addition to a hotter (Tdistant approximately equal to 106.3 +/- 0.1 K) plasma located beyond the galactic H I layer. The emission measure of the distant plasma is 4-5 times higher than of the local plasma. Therefore this distant plasma contributes significantly to the 1/4keV and 3/4keV diffuse background emission.

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