NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-23 T04:35:42 PDT
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For refcode 2011PASJ...63L...1K:
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Copyright by Astronomical Society of Japan. 2011PASJ...63L...1K Deep CO Observations and the CO-to-H_2_ Conversion Factor in DDO 154, a L ow Metallicity Dwarf Irregular Galax Komugi, Shinya; Yasui, Chikako; Kobayashi, Naoto; Hatsukade, Bunyo; Kohno, Kotaro; Sofue, Yoshiaki; Kyu, Shiori Abstract. We present a deep spectroscopic search for CO emission in the dwarf irregular galaxy DDO 154, which has an Oxygen abundance of only 1/20 of the solar value. The observations were conducted in order to constrain the CO-to-H_2_ conversion factor at low metallicity. No CO was detected, however, despite being one of the sensitive observations done towards galaxies of this type. We succeed in putting a strong lower limit on the conversion factor, at least 10-times the Galactic value. Our result supports previous studies that argue for a high conversion factor at low metallicity. Key words: galaxies: individual (DDO 154), galaxies: ISM, ISM: molecules, stars: formation
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