期刊
ASTRONOMY & ASTROPHYSICS
卷 521, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201015088
关键词
ISM: atoms; ISM: molecules; ISM: structure
资金
- Commonwealth of Australia
We present the first results of the Herschel open time key program, Galactic Observations of Terahertz C+ (GOT C+) survey of the [CII] P-2(3/2)-P-2(1/2) fine-structure line at 1.9 THz (158 mu m) using the HIFI instrument on Herschel. We detected 146 interstellar clouds along sixteen lines-of-sight towards the inner Galaxy. We also acquired HI and CO isotopologue data along each line-of-sight for analysis of the physical conditions in these clouds. Here we analyze 29 diffuse clouds (AV < 1.3 mag) in this sample characterized by having [CII] and HI emission, but no detectable CO. We find that [CII] emission is generally stronger than expected for diffuse atomic clouds, and in a number of sources is much stronger than anticipated based on their HI column density. We show that excess [CII] emission in these clouds is best explained by the presence of a significant diffuse warm H-2, dark gas, component. This first [CII] 158 mu m detection of warm dark gas demonstrates the value of this tracer for mapping this gas throughout the Milky Way and in galaxies.
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