Ammonia survey of small dark clouds

Details Ammonia survey of small dark clouds Ammonia survey of small dark clouds

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221l.117h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 221, May 1, 1978, p. L117-L120. Research supported by the Weizmann F

Astronomy and Astrophysics

Astrophysics

28

Ammonia, Cosmic Dust, Hyperfine Structure, Interstellar Matter, Spectral Line Width, Autocorrelation, Carbon Monoxide, Optical Thickness, Traveling Wave Masers

Scientific paper

Results are reported for a survey of 29 small dark clouds and dust globules which was carried out to observe the (J, K) = (1, 1) inversion line of NH3 using a K-band traveling-wave maser radiometer and a 1024-channel autocorrelator. Twelve definite detections are obtained along with an additional five possible detections. Typical line widths after corrections for hyperfine overlap are shown to be about 0.35 km/s. A typical H2 density of at least 5000 per cu cm is derived, optical depths typically of the order of unity are deduced for the main quadrupole hyperfine component, and it is found that severe clumping of NH3 molecules is probably unimportant in dark clouds. A comparison with previously observed CO line widths strongly suggests that systematic motions rather than microturbulence constitute the main line-broadening mechanism in dark clouds.

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