Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194..609l&link_type=abstract
Astrophysical Journal, vol. 194, Dec. 15, 1974, pt. 1, p. 609-618.
Astronomy and Astrophysics
Astrophysics
93
Infrared Stars, Interstellar Gas, Line Spectra, Molecular Spectra, Nebulae, Ammonia, Carbon Monoxide, Emission Spectra, Gas Density, Gravitational Collapse, Main Sequence Stars, Spectral Line Width, Stellar Spectra
Scientific paper
Narrow (not more than 2 km/sec wide) emission lines from millimeter- and centimeter-wave transitions of a number of molecules have been detected toward several dark nebulae known to contain H-H objects and infrared stars that are thought to be very young. Large dense clouds have been mapped in 2-mm H2CO emission toward NGC 1333 and M78. Determinations of nearly constant kinetic temperature through carbon-12 monoxide and NH3 observations in NGC 1333 indicate that the slight peaking of the emission from H2CO, CS, and HCN is probably due to increased gas density near the H-H object/infrared-star associations. Implied gravitational-collapse velocities are much larger than those allowed by the observed narrow molecular line widths.
Gottlieb Carl A.
Lada Charles J.
Lilley Edward A.
Litvak Marvin M.
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