Ammonia observations of cold cloud cores

Details Ammonia observations of cold cloud cores Ammonia observations of cold cloud cores

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...111..339u&link_type=abstract

Astronomy and Astrophysics, vol. 111, no. 2, July 1982, p. 339-345.

Astronomy and Astrophysics

Astrophysics

51

Ammonia, Interstellar Gas, Molecular Clouds, Stellar Evolution, Cold Gas, Cores, Gravitational Collapse, Radial Velocity, Temperature Effects

Scientific paper

The NH3 (1,1) and (2,2) lines have been observed towards the cores of seven dark dust clouds, mostly in the Taurus region. From these measurements the gas kinetic temperature is estimated to be close to 10 K. The cloud cores have sizes of about 0.05-0.3 pc, and densities of about 10,000-100,000/cu cm. No evidence is found for local heating by embedded protostellar objects. These cloud cores may be close to a stable state of hydrostatic equilibrium in which the gravitational forces are balanced by thermal pressure. In three cases, however, prima facie evidence is found for rotation, and the centrifugal force may be of importance for the dynamics.

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