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

Brett A. Mcguire 1 P. Brandon Carroll 1 P. Gratier 2 Jerome Pety 3, 4 Evelyne Roueff 5 Maryvonne Gerin 4 Geoffrey A. Blake 1 Anthony J. Remijan 6
2 AMOR 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : 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-.
Type de document :
Article dans une revue
Astrophysical Journal, American Astronomical Society, 2014, 783, pp.36. <10.1088/0004-637X/783/1/36>
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https://hal.archives-ouvertes.fr/hal-00992471
Contributeur : Jérôme Pety <>
Soumis le : dimanche 18 mai 2014 - 17:20:37
Dernière modification le : mardi 11 octobre 2016 - 14:58:41

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OBSPM | INSU | L3AB | LERMA | UPMC | LUTH | PSL | USPC

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Brett A. Mcguire, P. Brandon Carroll, P. Gratier, Jerome Pety, Evelyne Roueff, et al.. An Observational Investigation of the Identity of B11244 (l-C3H+/C3H-). Astrophysical Journal, American Astronomical Society, 2014, 783, pp.36. <10.1088/0004-637X/783/1/36>. <hal-00992471>

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