High Spectral Resolution Observations of the Soft X-ray Diffuse Background with Thermal Detectors

Details High Spectral Resolution Observations of the Soft X-ray Diffuse Background with Thermal Detectors High Spectral Resolution Observations of the Soft X-ray Diffuse Background with Thermal Detectors

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19513504m&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #135.04; Bulletin of the American Astronomical Society, Vol. 32, p.882

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A high spectral resolution observation of the diffuse X-ray background in the 70-1000 eV energy range has been made using an array of thirty-six 1 mm2 microcalorimeters flown on a sounding rocket. Detector energy resolution ranged from 6-11 eV FWHM, and a composite spectrum of 1 steradian of the background centered at l = 60°, b = +50° was obtained. The target area includes bright 1/4 keV regions, but avoids Loop I and the North Polar Spur. Lines of C VI, O VII, and O VIII are clearly detected. The forbidden-to-recombination ratio observed in O VII suggests that the material is not in collisional equilibrium. Upper limits on Fe lines appear inconsistent with normal abundances. The spectrum observed during a brief scan across the North Polar Spur is strikingly different. We include a description of the instrument and its detectors. This work was supported in part by NASA grant NAG5-679

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