Vibrationally excited HC_3N toward hot cores

Details Vibrationally excited HC_3N toward hot cores Vibrationally excited HC_3N toward hot cores

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341..882w&link_type=abstract

Astronomy and Astrophysics, v.341, p.882-895 (1999)

Astronomy and Astrophysics

Astrophysics

43

Ism: Clouds, Ism: H Ii Regions, Ism: Molecules, Radio Lines: Ism

Scientific paper

We report IRAM 30-m observations of vibrationally excited rotational transitions of HC_3{N} toward a sample of six ultra-compact Hii regions. In addition, Effelsberg 100-m and Plateau de Bure Interferometer measurements were conducted toward the region G10.47+0.03. We detected the v_7=1 state of cyanoacetylene toward all six regions and the v_6=1 line toward five of them. Toward G10.47+0.03, we detected lines from 11 different vibrationally excited states with excitation energies up to 1600 K above ground. Of these, six are first detections. We also have detected several transitions of (13) C substituted cyanoacetylene in the v6=1, v7=1, and v7=2 states and provide improved rest frequencies for several of these. The population distribution of the vibrationally excited HC_3{N} molecules is analyzed and it is concluded that our results are consistent with thermalised level populations at a temperature of 270 K. From the interferometer results we find the source of HC_3{N} emission to be coincident with NH3(4,4) and CH_3{CN} emission within the positional error of 1\arcsec. In an appendix, we report the first astronomical detection of lines from vibrationally excited HNCO in G10.47+0.03.

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