José Cernicharo et al 2000 ApJ 534 L199 doi:10.1086/312668
Far-infrared Detection of C3 in Sagittarius B2 and IRC +10216*
FREEJosé Cernicharo1, Javier R. Goicoechea1 and Emmanuel Caux2
Show affiliationsWe report on the detection of nine lines of the ν2 bending mode of triatomic carbon, C3, in the direction of Sagittarius B2. The R(4) and R(2) lines of C3 have been also detected in the carbon-rich star IRC +10216. The abundances of C3 in the direction of Sgr B2 and IRC +10216 are 
3 × 10-8 and 10-6, respectively. In Sgr B2 we have also detected the 23-12 line of NH with an abundance of a few times 10-9. Polyatomic molecules will have a weak contribution from their pure rotational spectrum to the emission/absorption in the far-infrared. We suggest, however, that they could be, through their low-lying vibrational bending modes, the dominant carriers of emission/absorption in the spectrum of bright far-infrared sources.
- Footnote
- Subject headings
infrared: ISM; ISM: lines and bands; ISM: individual (Sagittarius B2); ISM: molecules; line: identification; molecular data; radiative transfer
- Dates
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Issue 2 (2000 May 10)
Received 2000 February 11, accepted for publication 2000 March 23
Published 2000 May 5
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Far-infrared Detection of C3 in Sagittarius B2 and IRC +10216
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