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An Observational Investigation of the Identity of B11244 (l-C_3H^+/C_3H^–)

McGuire, Brett A. and Carroll, P. Brandon and Gratier, Pierre and Guzmán, Viviana and Pety, Jerome and Roueff, Evelyne and Gerin, Maryvonne and Blake, Geoffrey A. and Remijan, Anthony J. (2014) An Observational Investigation of the Identity of B11244 (l-C_3H^+/C_3H^–). Astrophysical Journal, 783 (1). Art. No. 36. ISSN 0004-637X.

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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-C_3H^+ cation. Recent high-level ab initio calculations have called this assignment into question; the anionic C_3H^– 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-C_3H^+ and C_3H^–. We find no observational evidence of K_a = 1 lines, which should be present were the carrier indeed C_3H^–. 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 C_3H^– 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 C_3H^–.

Item Type:Article
Related URLs:
URLURL TypeDescription
McGuire, Brett A.0000-0003-1254-4817
Carroll, P. Brandon0000-0002-3191-5401
Roueff, Evelyne0000-0002-4949-8562
Blake, Geoffrey A.0000-0003-0787-1610
Remijan, Anthony J.0000-0001-9479-9287
Additional Information:© 2014 American Astronomical Society. Received 2013 October 11; accepted 2013 November 27; published 2014 February 11. We are grateful to the anonymous referee for helpful comments which have greatly improved the quality of this manuscript. We thank E.A. Bergin and J.T. Neill for providing the HEXOS spectra presented here and M. Ohishi for providing the observational data toward TMC-1. We also thank H. Gupta, M. Cordiner, and A. Faure for insightful conversations. B.A.M. gratefully acknowledges funding by an NSF Graduate Research Fellowship. V.G. thanks support from the Chilean Government through the Becas Chile scholarship program. This work was partially funded by grant ANR-09-BLAN- 0231-01 from the French Agence Nationale de la Recherche as part of the SCHISM project. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
Becas Chile Scholarship ProgramUNSPECIFIED
Agence Nationale pour la Recherche (ANR)ANR-09-BLAN-0231-01
Subject Keywords:astrochemistry, ISM: clouds, ISM: individual objects (Sagittarius B2(N), TMC-1, Horsehead PDR, IRC+10216), ISM: molecules
Issue or Number:1
Record Number:CaltechAUTHORS:20140528-134232108
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Official Citation:An Observational Investigation of the Identity of B11244 (l-C3H+/C3H–) Brett A. McGuire et al. 2014 ApJ 783 36
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45943
Deposited By: Ruth Sustaita
Deposited On:28 May 2014 21:16
Last Modified:09 Mar 2020 13:19

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