Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1084w&link_type=abstract
Astronomical Journal, vol. 86, July 1981, p. 1084-1089. Research supported by the American Astronomical Society.
Astronomy and Astrophysics
Astronomy
16
Ammonia, Interstellar Matter, Line Spectra, Molecular Clouds, Stellar Evolution, Emission Spectra, Gas Density, Gas Temperature, Mass, Rotating Fluids, Spectral Line Width
Scientific paper
The line emission of the (J,K) = (1,1) and (2,2) transition of ammonia, NH3, has been mapped across the Mon R2 molecular cloud with an angular resolution of 1.5 min and a velocity resolution of 0.1 km/sec. The observations show that the NH3 emission is contained within an ellipsoidal region whose major axis lies nearly along the galactic plane. The line velocities vary systematically along the major axis, suggesting that the cloud is rotating along the galactic plane with a period of about 8 million yr. No systematic variations of the linewidths across the cloud were observed, indicating that the denser interior of the cloud outlined by the NH3 emission is not collapsing or expanding. Kinetic temperatures of about 15 K, hydrogen densities of about 3,000/cu cm, and a cloud mass of 300 solar masses are inferred from the observations.
Folch-Pi F. J.
Willson Robert F.
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