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Title: A SEARCH FOR l-C{sub 3}H{sup +} AND l-C{sub 3}H IN Sgr B2(N), Sgr B2(OH), AND THE DARK CLOUD TMC-1

Pety et al. recently reported the detection of several transitions of an unknown carrier in the Horsehead PDR and attribute them to l-C{sub 3}H{sup +}. 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) toward 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 toward Sgr B2(N) and Sgr B2(OH) using the Barry E. Turner Legacy Survey and results from the Kaifu et al. survey of TMC-1. We calculate an excitation temperature and column density of B11244 of {approx}10 K and {approx}10{sup 13} cm{sup -2} in Sgr B2(N) and {approx}79 K with an upper limit of {<=}1.5 Multiplication-Sign 10{sup 13} cm{sup -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{sub 3}H{sup +}.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ;  [6]
  1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (United States)
  2. Department of Chemistry, University of Virginia, Charlottesville, VA 22904 (United States)
  3. Division of Chemistry and Chemical Engineering and Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States)
  4. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  5. National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)
  6. National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
Publication Date:
OSTI Identifier:
22133949
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 774; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARRIERS; CATIONS; COSMIC DUST; DENSITY; DETECTION; EXCITATION; MOLECULES; SIGNALS; SPECTRA