Accession Number : AD0780922

Title :   Models of Massive Molecular Clouds,

Corporate Author : OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF

Personal Author(s) : Zuckerman,B. ; Evans,N. J. , II

Report Date : 1974

Pagination or Media Count : 14

Abstract : Observations of carbon monoxide lines from massive molecular clouds, such as those near Orion A and Sgr B2, have recently been interpreted in terms of large scale motions, generally collapse or expansion, that imply rapid evolution of these clouds. The authors suggest an alternative explanation: the clouds are not dominated by large scale systematic motions and the CO profiles are determined primarily by local motions. Therefore, it is generally not possible to see through these clouds in optically thick lines of molecules such as CO and HCN. Some consequences and tests of this model are briefly discussed. (Author)

Descriptors :   *Interstellar matter, *Carbon monoxide, Molecules, Line spectra, Clouds

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE