Peculiar (N-15)H3 toward NGC7538 - IRS 1

Details Peculiar (N-15)H3 toward NGC7538 - IRS 1 Peculiar (N-15)H3 toward NGC7538 - IRS 1

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..516s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 516-524.

Astronomy and Astrophysics

Astrophysics

7

Ammonia, H Ii Regions, Interstellar Masers, Molecular Clouds, Radiative Transfer, Absorption Spectra, Line Spectra, Molecular Collisions, Molecular Excitation

Scientific paper

In order to confirm maser action in the ammonia (4,3) transition as predicted by model calculations, observations of several (N-15)H3 transitions are conducted in the direction of a compact HII region. The detection of (N-15)H3(4,3) emission led to the detection of all (N-15)H3 lines to examine the properties of the emission when it is thermally excited and to identify other masers. The (4,3) and (4,4) are theorized to be weak masers amplifying the HII continuum, and the (3,3) maser is found to be relatively constant over a period of several years. The simultaneous existence of the maser types is considered with respect to model calculations for collisional pumping and IR-pumping. It is proposed that the pumping of the maser by 10-micron continuum radiation can explain simultaneous masing and the unpredicted (4,4) masing.

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