On the nature of the molecular cores in high-latitude cirrus clouds. V - NH3 and its chemistry

Details On the nature of the molecular cores in high-latitude cirrus clouds. V - NH3 and its chemistry On the nature of the molecular cores in high-latitude cirrus clouds. V - NH3 and its chemistry

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..219t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 219-234.

Statistics

Methodology

24

Ammonia, Cirrus Clouds, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Star Formation, Carbon Monoxide, Far Infrared Radiation, Formaldehyde, Gravitational Collapse, Molecular Excitation

Scientific paper

The paper presents the first report on the (1, 1) and (2, 2) transitions of NH3 in a subset of 11 cirrus clouds observed mainly in January 1989 at the 43 m telescope equipped with dual maser receivers, each of which could be tuned to wide enough bandwidth to include both lines simultaneously. The transitions are analyzed using methodology applied by Turner (1993) to analyze the 2 and 6 cm H2CO transitions. It was found that the radial distributiom of NH3 within the cirrus cores followes that of (C-18)O (Turner at al, 1992; Turner, 1993), in contrast to H2CO, which was found to have a flat or rising distribution with increasing radius. The ratio of (1, 1) to (2, 2) intensities was found to depend only on the temperature of all values of density of astrophysical interest.

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