Detection of HC5N in four dark clouds

Details Detection of HC5N in four dark clouds Detection of HC5N in four dark clouds

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242l..87b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 242, Dec. 1, 1980, p. L87-L91.

Astronomy and Astrophysics

Astrophysics

28

Acetylene, Cyano Compounds, Interstellar Matter, Molecular Clouds, Molecular Rotation, Stellar Envelopes, Abundance, Ammonia, Electron Transitions, Emission Spectra, T Tauri Stars

Scientific paper

The detection of HC5N emission in two dark clouds outside the Taurus complex (L 134N and L 778) and two additional clouds within the Taurus complex (L 1489 and L 1536) is reported, and observations of NH3 transitions in the same clouds are presented. Observations were made of the J = 9 - 8 rotational transition of HC5N at 23,963.888 MHz as well as the (J, K) = (1, 1) and (2, 2) rotation inversion transitions of NH3 for approximately 150 areas of high apparent extinction. The four clouds containing HC5N are found to have a HC5N abundance of approximately 10 to the -9th, a factor of 10 smaller than that of the Taurus cloud TMC-1. The NH3 observations indicate that the NH3 abundance is not correlated with that of HC5N, and reveal NH3 number densities of 10,000/cu cm and kinetic temperatures around 10 K.

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