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
See more >
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
< Reduce
Division of Chemistry and Chemical Engineering, California Institute of Technology
Language
en
Article de revue
This item was published in
The Astrophysical Journal. 2014-03, vol. 783, p. 36
American Astronomical Society
English 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 ...Read more >
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-.Read less <
English Keywords
ISM: molecules
ISM: individual objects: Sagittarius B2(N) TMC-1 Horsehead PDR IRC+10216
astrochemistry
ISM: clouds
Origin
Hal imported