Deep CO Observations and the CO-to-H_2 Conversion Factor in DDO 154, a Low Metallicity Dwarf Irregular Galaxy - INSPIRE

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Deep CO Observations and the CO-to-H_2 Conversion Factor in DDO 154, a Low Metallicity Dwarf Irregular Galaxy

Nov, 2010

11 pages

Published in:

Publ.Astron.Soc.Jap. 63 (2011) L1

e-Print:

1011.3385 [astro-ph.CO]

DOI:

10.1093/pasj/63.1.L1

View in:

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Abstract: (arXiv)

We present a deep spectroscopic search for CO emission in the dwarf irregular galaxy DDO154, which has an Oxygen abundance of only 1/20 the solar value. The observations were conducted in order to constrain the CO-to-

\mathrm{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 which argue for a high conversion factor at low metallicity.

Note:

11 pages, 4 figures. Accepted for publication in PASJ

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