CO-to-H2 conversion factor of molecular clouds using X-ray shadows

Yoshiaki Sofue, Jun Kataoka

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    A new method to determine the CO-to-H2 conversion factor XCO using absorption of diffuse X-ray emission by local molecular clouds was developed. It was applied to the Ophiuchus (G353+17) and Corona Australis (G35918) clouds using CO line and soft X-ray archival data. We obtained a value XCO = 1.85±0.45 1020 H2 cm-2 (Kkms-1)-1 as the average of least-2 fitting results for R4 (0.7 keV) and R5 (0.8 keV) bands.

    Original languageEnglish
    Article numberL8
    JournalPublications of the Astronomical Society of Japan
    Issue number3
    Publication statusPublished - 2016 Jun 1


    • Clouds-ISM
    • Diffuse background
    • ISM
    • Lines and bands-ISM
    • Molecules-X-rays

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science


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