Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...103..197g&link_type=abstract
Astronomy and Astrophysics, vol. 103, no. 1, Nov. 1981, p. 197-206.
Astronomy and Astrophysics
Astrophysics
127
Ammonia, Galactic Nuclei, Galactic Structure, Interstellar Matter, Molecular Clouds, Cosmic Dust, Data Reduction, Late Stars, Line Of Sight, Temperature Distribution
Scientific paper
The molecular clouds in the immediate neighbourhood of the galactic center have been mapped in the (1,1) and (2,2) transitions of ammonia with 40-arcsec resolution. Selected positions have also been measured in the (4,4) line in order to obtain an estimate of the kinetic temperature in the molecular clouds. It is concluded that the temperature is in the range 50-120 K and is fairly uniform throughout the cloud. The present data suggest that the gas temperature is higher than the temperature of the dust in the same region, and it is found that the gas may be heated due to ionization by a large flux of low-energy cosmic rays. Some consequences of both this unusual heating source and the high gas temperature are discussed briefly. The present results are compared with other molecular maps as well as with the distribution of late-type stars and it is suggested that the molecular clouds are probably about 100 pc from the center on the near side.
Guesten Rolf
Pauls Thomas
Walmsley Charles Malcolm
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