The Atomic Component of the Taurus Molecular Cloud Complex: Measurements and Implications

Details The Atomic Component of the Taurus Molecular Cloud Complex: Measurements and Implications The Atomic Component of the Taurus Molecular Cloud Complex: Measurements and Implications

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2902k&link_type=abstract

American Astronomical Society, AAS Meeting #211, #29.02; Bulletin of the American Astronomical Society, Vol. 39, p.780

Astronomy and Astrophysics

Astronomy

1

Scientific paper

A key aspect in understanding the chemistry and formation of molecular cloud complexes such as the one in Taurus comes from the interplay between atomic and molecular hydrogen gas. The conversion process, and current ratio of HI to H2 is dependent on many localized and global factors such as age, dust density, temperature, and the UV radiation field. We present here an HI map of the entire Taurus region and the surrounding environment made with the 7 pixel dual polarization Arecibo L-Band Feed Array (ALFA). With 3 arcminute resolution, the region shows considerable filamentary structure, as well as an abundance of HI Narrow Self-Absorption (HINSA) features throughout the cloud. Utilizing a new technique in conjunction with 12CO and 13CO maps of the region we present the first detailed, large-scale map of the cold HI gas located in the interior of the cloud. Comparison with molecular tracers yields the HI/H2 ratio and a more complete understanding of the cloud chemistry. Estimates of the chemical age throughout the cloud provide insight into its formation and history.

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