An Observational Investigation of the Identity of B11244 (l-C3H+/C3H-)
MCGUIRE, Brett A.
Division of Chemistry and Chemical Engineering, California Institute of Technology
Division of Chemistry and Chemical Engineering, California Institute of Technology
CARROLL, P. Brandon
Division of Chemistry and Chemical Engineering, California Institute of Technology
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Division of Chemistry and Chemical Engineering, California Institute of Technology
MCGUIRE, Brett A.
Division of Chemistry and Chemical Engineering, California Institute of Technology
Division of Chemistry and Chemical Engineering, California Institute of Technology
CARROLL, P. Brandon
Division of Chemistry and Chemical Engineering, California Institute of Technology
Division of Chemistry and Chemical Engineering, California Institute of Technology
PETY, Jerome
Institut de RadioAstronomie Millimétrique [IRAM]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Institut de RadioAstronomie Millimétrique [IRAM]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
ROUEFF, Evelyne
Laboratoire Univers et Théories [LUTH (UMR_8102)]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Laboratoire Univers et Théories [LUTH (UMR_8102)]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
BLAKE, Geoffrey A.
Division of Chemistry and Chemical Engineering, California Institute of Technology
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Division of Chemistry and Chemical Engineering, California Institute of Technology
Langue
en
Article de revue
Ce document a été publié dans
The Astrophysical Journal. 2014-03, vol. 783, p. 36
American Astronomical Society
Résumé en anglais
Pety et al. have reported the detection of eight transitions of a closed-shell, linear molecule (B11244) in observations toward the Horsehead photodissociation region (PDR), which they attribute to the l-C3H+ cation. Recent ...Lire la suite >
Pety et al. have reported the detection of eight transitions of a closed-shell, linear molecule (B11244) in observations toward the Horsehead photodissociation region (PDR), which they attribute to the l-C3H+ cation. Recent high-level ab initio calculations have called this assignment into question; the anionic C3H- molecule has been suggested as a more likely candidate. Here, we examine observations of the Horsehead PDR, Sgr B2(N), TMC-1, and IRC+10216 in the context of both l-C3H+ and C3H-. We find no observational evidence of Ka = 1 lines, which should be present were the carrier indeed C3H-. Additionally, we find a strong anticorrelation between the presence of known molecular anions and B11244 in these regions. Finally, we discuss the formation and destruction chemistry of C3H- in the context of the physical conditions in the regions. Based on these results, we conclude there is little evidence to support the claim that the carrier is C3H-.< Réduire
Mots clés en anglais
ISM: molecules
ISM: individual objects: Sagittarius B2(N) TMC-1 Horsehead PDR IRC+10216
astrochemistry
ISM: clouds
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