First Results from the Diffuse X-ray Spectrometer (DXS)

Details First Results from the Diffuse X-ray Spectrometer (DXS) First Results from the Diffuse X-ray Spectrometer (DXS)

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0807s&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #08.07; Bulletin of the American Astronomical Society, Vol. 25, p.804

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The Diffuse X-ray Spectrometer (DXS) was flown as an attached Shuttle payload on the STS-54 Space Shuttle Endeavour mission in January 1993. DXS consists of two large-area Bragg crystal X-ray spectrometers that cover the 44 - 83 Angstroms wavelength range, and is designed to measure the spectrum of the low energy (0.15 < E < 0.28\ keV) diffuse X-ray background with roughly 10 eV energy resolution and 15(deg) angular resolution. These diffuse X-rays are thought to be generated by a very hot (10(6) K) component of the interstellar medium that occupies a large fraction of the interstellar volume near the Sun. We present spectra of the soft X-ray background in the energy range 0.15 < E < 0.28\ keV. We obtained spectra from 10 independent 15(deg) times 15(deg) regions of the sky along a great circle 150(deg) long, which runs about 10(deg) north of the galactic plane through the third quadrant of the galaxy. The spectra show emission lines, the first direct evidence that the soft X-ray background arises in hot interstellar gas. The spectra of these regions are not all the same. This work was supported by NASA contract NAS 5-26078.

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