Gas temperatures and motion in the Taurus dark cloud

Details Gas temperatures and motion in the Taurus dark cloud Gas temperatures and motion in the Taurus dark cloud

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215l..29h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 215, July 1, 1977, p. L29-L33.

Other

55

Ammonia, Gas Temperature, Hyperfine Structure, Interstellar Gas, Molecular Spectra, Astronomical Spectroscopy, Carbon Monoxide, Gas Flow, Hydrogen, Hydroxyl Emission, Spectral Line Width

Scientific paper

Second-order magnetic hyperfine structures of the J, K = 1, 1 transition of NH3 have been resolved toward Taurus and other dark clouds. A line width of 0.27 km/s is deduced for each hyperfine component toward Taurus. This corresponds to a kinetic temperature of approximately 28 K if the observed line width is taken to be thermal. From the excitation temperature of (C-12)O and an upper limit on the J, K = 2, 2 line of NH3, the kinetic temperature is deduced to be about 12 K. Line broadening in NH3, CO, OH, and H I is attributed to large-scale motion. This is consistent with an observed velocity gradient of 2 km/s per pc across the line of sight.

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