Observations of HC5N and HC7N in SGR B2 and Cloud 2

Details Observations of HC5N and HC7N in SGR B2 and Cloud 2 Observations of HC5N and HC7N in SGR B2 and Cloud 2

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192..651r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, Sept. 1980, p. 651-658.

Astronomy and Astrophysics

Astronomy

5

Electron Transitions, Hydrocyanic Acid, Interstellar Matter, Molecular Spectra, Radiative Transfer, Abundance, Hyperfine Structure, Interstices, Normal Density Functions, Thermodynamic Equilibrium

Scientific paper

We present observations of the J = 3 → 2 transition of HC5N and of the J = 7 → 6 transition of HC7N in Sgr B2 and Cloud 2. In Sgr B2 we confirm the results of Avery et al. (1979) indicating that several of the low J lines of HC5N are weak masers. The intensities of the hyperfine components of HC5N measured in Cloud 2 agree with the expected thermal ratios, and the available data were satisfactorily fitted to a simple local thermodynamic equilibrium model with a column density of 1.6 × 1014 and an excitation temperature of 15K. HC7N was not detected in Sgr B2. The J = 7 → 6 transition of HC7N measured in Cloud 2 gives a [HC5N/HC7N] abundance ratio of 7±3.

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