Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-21
Astronomy and Astrophysics
Astrophysics
Accepted for Astrophycal Journal 8/2008
Scientific paper
10.1086/592553
The presence of atomic gas mixed with molecular species in a "molecular" cloud may significantly affect its chemistry, the excitation of some species, and can serve as probe of the cloud's evolution. Cold neutral atomic hydrogen (HI) in molecular clouds is revealed by its self absorption of background galactic HI 21-cm emission. The properties of this gas can be investigated quantitatively through observation of HI Narrow Self-Absorption (HINSA). In this paper, we present a new technique for measuring atomic gas physical parameters from HINSA observations that utilizes molecular tracers to guide the HINSA extraction. This technique offers a significant improvement in the precision with which HI column densities can be determined over previous methods, and it opens several new avenues of study of relevance to the field of star formation.
Brown Robert L.
Goldsmith Paul F.
Krco Marko
Li Di
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