Journal
ASTROPHYSICAL JOURNAL
Volume 576, Issue 1, Pages 188-203Publisher
IOP PUBLISHING LTD
DOI: 10.1086/341727
Keywords
instrumentation : detectors; instrumentation : spectrographs; intergalactic medium; space vehicles : instruments; X-rays : diffuse background; X-rays : ISM
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A high spectral resolution observation of the diffuse X-ray background in the 60 1000 eV energy range has been made using an array of 36 1 mm(2) microcalorimeters own on a sounding rocket. Detector energy resolution ranged from 5 to 12 eV FWHM, and a composite spectrum of similar to1 sr of the background centered at l = 90degrees, b = +60degrees was obtained with a net resolution of similar to9 eV. 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 with intensities of 5.4 +/- 2.3, 4.8 +/- 0.8, and 1.6 +/- 0.4 photons cm(-2) s(-1) sr(-1), respectively. The oxygen lines alone account for a majority of the diffuse background observed in the ROSAT R4 band that is not due to resolved extragalactic discrete sources. We also have a positive detection of the Fe-M line complex near 70 eV at an intensity consistent with previous upper limits that indicate substantial gas-phase depletion of iron. We include a detailed description of the instrument and its detectors.
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