MCGUIRE, Brett A.; CARROLL, P. Brandon; GRATIER, P.; GUZMAN VELOSO, Viviana; PETY, Jerome; ROUEFF, Evelyne; GERIN, Maryvonne; BLAKE, Geoffrey A.; REMIJAN, Anthony J.

doi:10.1088/0004-637X/783/1/36

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MCGUIRE, Brett A.
California Institute of Technology [CALTECH]

CARROLL, P. Brandon
California Institute of Technology [CALTECH]

GRATIER, P.
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Institut de RadioAstronomie Millimétrique [IRAM]

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The Astrophysical Journal. 2014-03, vol. 783, p. 36

American Astronomical Society

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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

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ISM: molecules

ISM: individual objects: Sagittarius B2(N) TMC-1 Horsehead PDR IRC+10216

astrochemistry

ISM: clouds

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An Observational Investigation of the Identity of B11244 (l-C3H+/C3H-)

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