Other
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.189...29p&link_type=abstract
In ESA The Sci. Importance of Submillimetre Observations p 29-30 (SEE N83-22034 11-88)
Other
Fragmentation, Molecular Clouds, Protostars, Spontaneous Emission, Stellar Evolution, Thermalization (Energy Absorption), Abundance, Angular Resolution, Density Distribution, Line Spectra, Radiation Trapping, Telescopes, Temperature
Scientific paper
An unresolved uniform isothermal contracting gas cloud has maximum emission in any molecular line over a range of densities defined at the lower end by the requirement for thermalization by collisions and at the other end by the need for the optical depth to be less than or approximately equal to 1. This makes it likely that with relatively low sensitivity fragments will only be detected with densities close to the critical density. However, present day instruments such as UKIRT are approaching sensitivities at which it will be just possible to detect clumps with masses of between 0.1 and 1 solar mass. A slightly more massive clump may already have been detected in OMC1, and is possibly associated with H2O maser emission.
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