A recalibration of the interstellar ammonia thermometer

Details A recalibration of the interstellar ammonia thermometer A recalibration of the interstellar ammonia thermometer

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..229d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 1, 1988, p. 229-238.

Astronomy and Astrophysics

Astronomy

158

Ammonia, Calibrating, Gas Temperature, Interstellar Matter, Molecular Clouds, Molecular Rotation, Statistical Analysis, Thermometers

Scientific paper

Rate coefficients for the rotational excitation of para- and ortho-NH3 by para-H2 (J = 0) are presented for kinetic temperatures in the 15-300 K range. The rate coefficients were derived from quantal calculations of the cross-sections on a fine grid of collision energies. These results, together with extrapolations for levels (J, K) of ammonia with J of greater than 6, have been used to recalibrate the ammonia thermometer, which may be used to determine the kinetic temperatures of interstellar molecular clouds. It is found that the kinetic temperatures which are deduced after recalibration are significantly lower than were predicted with a previous calibration. Furthermore, the recalibrated NH3 temperatures are in better agreement with CO temperatures for a sample of sources.

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