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The C3H2 2(20)-2(11) transition: absorption in cold dark clouds.

H E Matthews1, S C Madden, L W Avery

  • 1Herzberg Institute of Astrophysics, National Research Council of Canada.

The Astrophysical Journal
|August 15, 1986
PubMed
Summary
This summary is machine-generated.

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The 2(20)-2(11) transition of cyclopropenylidene (C3H2) was observed for the first time. This transition appears in absorption, indicating cold temperatures (Tex < 2.7 K) in interstellar dust clouds.

Area of Science:

  • Astronomy and Astrophysics
  • Astrochemistry
  • Molecular Spectroscopy

Background:

  • Cyclopropenylidene (C3H2) is a key molecule in interstellar chemistry.
  • Understanding C3H2 excitation is crucial for interpreting astronomical observations.
  • Previous studies focused on specific transitions of C3H2.

Purpose of the Study:

  • To report the first observations of the 2(20)-2(11) transition of C3H2.
  • To determine the excitation conditions of C3H2 in cold dust clouds.
  • To compare excitation properties with other C3H2 transitions.

Main Methods:

  • Radioastronomical observations at 21.6 GHz.
  • Detection of the C3H2 2(20)-2(11) transition.
  • Analysis of line absorption characteristics.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

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Main Results:

  • The 2(20)-2(11) transition of C3H2 was successfully observed.
  • The transition was consistently detected in absorption.
  • This indicates a low excitation temperature (Tex < 2.7 K) in cold dust clouds.

Conclusions:

  • The observed absorption confirms C3H2 is "refrigerated" in cold interstellar environments.
  • Results provide insights into the excitation mechanisms of C3H2.
  • Comparison with other transitions aids in understanding molecular excitation in space.