A Caltech Library Service

A Search for l-C_3H^+ and l-C_3H in Sgr B2(N), Sgr B2(OH), and the Dark Cloud TMC-1

McGuire, Brett A. and Carroll, P. Brandon and Loomis, Ryan A. and Blake, Geoffrey A. and Hollis, Jan M. and Lovas, Frank J. and Jewell, Philip R. and Remijan, Anthony J. (2013) A Search for l-C_3H^+ and l-C_3H in Sgr B2(N), Sgr B2(OH), and the Dark Cloud TMC-1. Astrophysical Journal, 774 (1). Art. No. 56. ISSN 0004-637X.

PDF - Published Version
See Usage Policy.

PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


Pety et al. (2012) recently reported the detection of several transitions of an unknown carrier in the Horsehead PDR and attribute them to l-C_3H^+. Here, we have tested the predictive power of their fit by searching for, and identifying, the previously unobserved J = 1−0 and J = 2−1 transitions of the unknown carrier (B11244) towards Sgr B2(N) in data from the publicly available PRIMOS project. Also presented here are observations of the J = 6 − 5 and J = 7 − 6 transitions towards Sgr B2(N) and Sgr B2(OH) using the Barry E. Turner Legacy Survey and results from the Kaifu et al. (2004) survey of TMC-1. We calculate an excitation temperature and column density of B11244 of ∼10 K and ∼10^(13) cm^(−2) in Sgr B2(N) and ∼79 K with an upper limit of ≤ 1.5 × 10^(13) cm^(−2) in Sgr B2(OH) and find trace evidence for the cation’s presence in TMC-1. Finally, we present spectra of the neutral species in both Sgr B2(N) and TMC-1, and comment on the robustness of the assignment of the detected signals to l-C_3H^+.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper DOIArticle
McGuire, Brett A.0000-0003-1254-4817
Carroll, P. Brandon0000-0002-3191-5401
Loomis, Ryan A.0000-0002-8932-1219
Blake, Geoffrey A.0000-0003-0787-1610
Remijan, Anthony J.0000-0001-9479-9287
Additional Information:© 2013 The American Astronomical Society. Received 2013 May 17; accepted 2013 July 7; published 2013 August 16. The authors are grateful to M. Ohishi for providing the observational data towards TMC-1 and to the anonymous referee for very helpful comments. B.A.M. gratefully acknowledges funding by an NSF Graduate Research Fellowship. 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
Subject Keywords:astrochemistry – ISM: clouds – ISM: individual objects (Sagittarius B2(N), Sagittarius B2(OH), TMC-1) – ISM: molecules
Issue or Number:1
Record Number:CaltechAUTHORS:20130723-115242932
Persistent URL:
Official Citation:A Search for l-C3H+ and l-C3H in Sgr B2(N), Sgr B2(OH), and the Dark Cloud TMC-1 Brett A. McGuire et al. 2013 ApJ 774 56
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39530
Deposited By: Ruth Sustaita
Deposited On:23 Jul 2013 20:19
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page