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A new infrared band in the Interstellar and Circumstellar Clouds: C_4 or C_4H?

AutorCernicharo, José ; Goicoechea, Javier R. ; Benilan, Y.
Palabras claveInfrared: general
ISM: individual (Sagittarius B2)
ISM: lines and bands
ISM: molecules
Line: identification
Stars: individual (CRL 618, CRL 2688, IRC +10216, NGC 7027)
Fecha de publicación17-oct-2002
EditorAmerican Astronomical Society
CitaciónThe Astrophysical Journal Letters, 580:L157–L160, 2002 December 1
ResumenWe report on the detection with the Infrared Space Observatory (ISO) of a molecular band at 57.5 microns (174 cm^{-1}) in carbon-rich evolved stars and in Sgr B2. Taking into account the chemistry of these objects the most likelihood carrier is a carbon chain. We tentatively assign the band to the nu_5 bending mode of C_4 for which a wavenumber of 170-172.4 cm^{-1} has been derived in matrix experiments (Withey et al. 1991). An alternate carrier might be C_4H, although the frequency of its lowest energy vibrational bending mode, nu_7, is poorly known (130-226 cm^{-1}). If the carrier is C_4, the derived maximum abundance is nearly similar to that found for C_3 in the interstellar and circumstellar media by Cernicharo, Goicoechea & Caux (2000). Hence, tetra-atomic carbon could be one of the most abundant carbon chain molecules in these media.
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