Detection of /sup 13/CO(J = 3--2) emission from the molecular clouds OMC-1 and NGC 2264

Journal Article · Sun Mar 15 00:00:00 EST 1981 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/158762· OSTI ID:6192248

Huggins, P J; Phillips, T G; Blair, G N; Solomon, P M

We have made the first measurements of the 330 GHz J = 3--2 lines of /sup 13/CO in the molecular clouds OMC-1 and NGC 2264. Simple velocity gradient calculations can give a consistent description of the intensities of these lines, together with the available CO (J = 2--1) isotopic lines and the equivalent J = 1--0 transitions. They indicate fractional /sup 13/CO abundances similar to those found in dark clouds, but low values of the molecular hydrogen density, n(H/sub 2/)roughly-equal5 x 10/sup 3/ cm/sup -3/. The higher densities (approx.10/sup 5/ cm/sup -3/) indicated by other molecular observations of these clouds suggest either the presence of high density fragments within the clouds or that the simple analysis is not appropriate for the CO lines, and more complex models are required to explain all the observations.

• Research Organization: Bell Laboratories, Murray Hill, New Jersey
• OSTI ID: 6192248
• Journal Information: Astrophys. J.; (United States), Vol. 244:3
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON MONOXIDE
ABUNDANCE
NEBULAE
ENERGY SPECTRA
CARBON 13
COSMIC RADIO SOURCES
EMISSION
ENERGY-LEVEL TRANSITIONS
INTERSTELLAR SPACE
MOLECULES
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
EVEN-ODD NUCLEI
ISOTOPES
LIGHT NUCLEI
NUCLEI
OXIDES
OXYGEN COMPOUNDS
SPACE
SPECTRA
STABLE ISOTOPES
640105* - Astrophysics & Cosmology- Galaxies