| Issue |
EAS Publications Series
Volume 75-76, 2015
Conditions and Impact of Star Formation
|
|
|---|---|---|
| Page(s) | 101 - 102 | |
| Section | Star Formation in Disk Galaxies: Morphology, Structure, and Dynamics | |
| DOI | https://doi.org/10.1051/eas/1575018 | |
| Published online | 20 May 2016 | |
R. Simon, R. Schaaf and J. Stutzki (eds)
EAS Publications Series, 75–76 (2015) 101-102
[Ci](1–0) observations in M33 A study of CO dark H2 gas in M33
1 I. Physikalisches Institut, Universität zu Köln, Zülpicher Strase, 50937 Köln, Germany
2 Tata Inst. of Fundamental Research, Homi Bhabha Road, Colaba Mumbai, 400005 bv, India
3 HERM33ES, Herschel open time key project
https://www.iram.es/IRAMES/hermesWiki
Based on [Ci] (1–0) observations and complementary Hi, 12/13CO (1–0), 12CO (2–1) and [Cii] data we estimated the column density and fraction of molecular hydrogen in GMCs along the major axis of the galaxy M33. We found that on average 75%± 14% of the hydrogen is in molecular form. Roughly 40–45% of the H2 is both traced by [Cii] and CO, while ∼ 15% by the [Ci] lines. The found CO-dark H2 gas fractions are within the predictions by Wolfire et al. (2010) for a half solar metallicity, Z = 0.5 Z⊙, as in M33.
© EAS, EDP Sciences, 2016