Hydrogen-Dating Molecular Clouds

Details Hydrogen-Dating Molecular Clouds Hydrogen-Dating Molecular Clouds

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1724k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.24; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Using improved techniques for measuring the atomic hydrogen content of dark clouds utilizing HI Narrow Self-Absorption (HINSA) in conjunction with more traditional methods for determining the molecular hydrogen content we are able to estimate the HI/H2 ratio in an expanded sample of dark cloud cores. Using a simple evolutionary model we can estimate the ages of individual clouds or regions. We present the results of our survey of 36 dark cloud cores which exhibit HINSA absorption features. This dating procedure imposes constraints on the time scale for star formation in dense molecular regions.

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