Abstract
Soft X-rays (0.1–0.8 keV) from the region including theϱ Oph dark cloud were observed with the SAS-3 low-energy X-ray telescope. No X-ray absorption by the cloud was observed. This indicates that the diffuse component of soft X-rays in this region is mostly from the foreground of theϱ Oph cloud which is located at a distance of 160–200 pc.
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Apparao, K.M.V., Hayakawa, S. & Hearn, D.R. Soft X-ray observation of theϱ ophiuchus dark cloud region. Astrophys Space Sci 65, 419–422 (1979). https://doi.org/10.1007/BF00648506
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DOI: https://doi.org/10.1007/BF00648506