A new thermometer for external galaxies

Details A new thermometer for external galaxies A new thermometer for external galaxies

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.296..632m&link_type=abstract

Nature, vol. 296, Apr. 15, 1982, p. 632, 633.

Astronomy and Astrophysics

Astronomy

15

Galactic Nuclei, Molecular Clouds, Radio Astronomy, Stellar Evolution, Temperature Measurement, Ammonia, Astronomical Spectroscopy, Brightness Temperature, Carbon Monoxide, Gas Temperature, Kinetic Energy, Line Spectra, Radio Frequencies

Scientific paper

A new spectroscopic method at radio frequencies is introduced to measure the temperature of giant cloud complexes in external galaxies. The J, K equals 2,2 NH3 inversion transition at a wavelength of 1.3 cm was detected in the nucleus of galaxy IC342. A kinetic temperature of 50 + or - 15 K is deduced with an equivalent size scale of at least 25 parsecs for the molecular gas. The results are consistent with line formation in the nucleus where very active star formation is taking place.

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