Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...486..493l&link_type=abstract
Astronomy and Astrophysics, Volume 486, Issue 2, 2008, pp.493-496
Astronomy and Astrophysics
Astrophysics
7
Ism: Molecules, Astrochemistry, Ism: Clouds
Scientific paper
Context: An unexpectedly complex polyatomic chemistry exists in diffuse clouds, allowing detection of species such as C2H, C3H2, H2CO, and NH3, which have relative abundances that are strikingly similar to those inferred toward the dark cloud TMC-1. Aims: We probe the limits of complexity of diffuse cloud polyatomic chemistry. Methods: We used the IRAM Plateau de Bure Interferometer to search for galactic absorption from low-lying J = 2-1 rotational transitions of A- and E-CH3OH near 96.740 GHz and used the VLA to search for the J = 8-7 transition of HC5N at 21.3 GHz. Results: Neither CH3OH nor HC5N were detected at column densities well below those of all polyatomics known in diffuse clouds and somewhat below the levels expected from comparison with TMC-1. The HCN/HC5N ratio is at least 3-10 times higher in diffuse gas than toward TMC-1.
Based on observations obtained with the IRAM Plateau de Bure Interferometer and the NRAO VLA telescope.
Liszt Harvey Steven
Lucas Robert
Pety Jérôme
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