The discovery of an interstellar N-15H3 maser

Details The discovery of an interstellar N-15H3 maser The discovery of an interstellar N-15H3 maser

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160l..13m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 2, May 1986, p. L13-L16.

Astronomy and Astrophysics

Astrophysics

26

Ammonia, Astronomical Spectroscopy, Interstellar Masers, Molecular Clouds, Radio Spectra, Absorption Spectra, Abundance, Atomic Interactions, Emission Spectra, H Ii Regions, Line Spectra, Spectrum Analysis

Scientific paper

From a comparison between the (J,K) = (1,1), (2,2) absorption lines, the (3,3) emission line and limits for the (4,4) line, the authors conclude that maser emission is present in the (J,K) = (3,3) inversion transition of 15NH3 toward the compact H II region NGC 7538-IRS1. Model computations show that the maser emission may originate from the hot molecular condensation described by Wilson et al. (1983). The probable maser pump is collisional, involving a transfer of population from the K = 0 to the K = 3 ladder of 15NH3. Such a process places constraints on the parity selection rules in collision rates. The 14NH3/15NH3 abundance ratio is found to be ≡500.

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