Volume 582, October 2015
|Number of page(s)||4|
|Published online||07 October 2015|
Hyperfine structure of the cyanomethyl radical (CH2CN) in the L1544 prestellar core
Université de Toulouse, UPS-OMP, IRAP,
2 CNRS, IRAP, 9 Av. Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France
3 Department of Physics, University of Tokyo, Bunkyo-ku, 113-0033 Tokyo, Japan
4 Université de Grenoble Alpes, IPAG, 38000 Grenoble, France
5 CNRS, IPAG, 38000 Grenoble, France
6 Observatorio Astronómico Nacional (OAN, IGN), Calle Alfonso XII, 3, 28014 Madrid, Spain
Received: 10 August 2015
Accepted: 16 September 2015
The L1544 prestellar core has been observed as part of the ASAI IRAM Large Program at 3 mm. These observations led to the detection of many complex molecules. In this Letter we report the detection of the cyanomethyl radical for the first time in a prototypical prestellar core, which is possible through the high sensitivity of the IRAM EMIR receiver. A complex structure in which we suspect the presence of the hyperfine transitions of the ortho and para forms is observed thanks to the high spectral resolution of ~50 kHz. We computed all transition frequencies and line intensities for all transitions including satellite hyperfine components for the ortho and para forms of CH2CN at the frequencies observed by ASAI. We report the first detection of the fine and hyperfine structure of the ortho and para forms of the cyanomethyl radical at ~101 GHz, resolved in this cold dense core.
Key words: astrochemistry / line: identification / molecular data / radiative transfer
© ESO, 2015
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