Ammonia-line observations of the Mon R2 molecular cloud
Line emission of the (J,K) = (1,1) and (2,2) transition of ammonia, NH/sub 3/, has been mapped across the Mon R2 molecular cloud with an angular resolution of 1.5' and a velocity resolution of 0.1 km s/sup -1/. The observations show that the NH/sub 3/ 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 x 10/sup 6/ yr. We failed to observe any systematic variations of the linewidths across the cloud, indicating that the denser interior of the cloud outlined by the NH/sub 3/ emission is not collapsing or expanding. Kinetic temperatures of about 15 K, hydrogen densities of about 3 x 10/sup 3/ cm/sup -3/, and a cloud mass of 300M/sub sun/ are inferred from the observations.
- Research Organization:
- Department of Physics, Tufts University, Medford, Massachusetts 02155
- OSTI ID:
- 5990421
- Journal Information:
- Astron. J.; (United States), Vol. 86:7
- Country of Publication:
- United States
- Language:
- English
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