Abstract
Measurements of the soft X-ray background flux show good qualitative correlation with 21 cm measurements of columnar hydrogen density but too little apparent absorption. A portion of the flux may originate in unresolved population II objects or may be extragalactic.
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BUNNER, A., COLEMAN, P., KRAUSHAAR, W. et al. Soft X-Ray Background Flux. Nature 223, 1222–1226 (1969). https://doi.org/10.1038/2231222a0
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DOI: https://doi.org/10.1038/2231222a0
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