Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..349t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 349-355. Research supported by the Alexander von Hum
Astronomy and Astrophysics
Astrophysics
39
Astronomical Spectroscopy, Bipolarity, Molecular Clouds, Molecular Flow, Stellar Evolution, Temperature Distribution, Ammonia, Cosmic Dust, Infrared Spectra, Kinetic Theory, Line Spectra, Pre-Main Sequence Stars
Scientific paper
The kinetic temperature of surrounding molecular clouds in typical bipolar flow sources has been determined using NH3 (J, K) = (1, 1) and (2, 2) line observations. The kinetic temperature shows a strong correlation with the luminosity of the exciting infrared sources. The surrounding molecular clouds may be heated by the central infrared sources via hot dust grains, and the contribution of collisional heating by outflowing material seems to be negligible. Small deviations of the kinetic temperature in the luminosity-temperature diagram, against a significant change of the optical depth of the lines, suggests that the molecular gas is thermally coupled with the dust grains in sources of less than about 10,000 solar luminosities.
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