Computer Science
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9116977s&link_type=abstract
Unknown
Computer Science
Fine Structure, Galactic Nuclei, Galaxies, Ionized Gases, Molecular Clouds, Star Formation, Cosmic Gases, Far Infrared Radiation, Gas Temperature, Line Spectra, Luminosity, Molecular Gases
Scientific paper
Some 158 micron (CII) fine structure line observations from a sample of fourteen gas rich galaxies are reported. These measurements confirm and generalize previous basic results that the (CII) line is bright amounting to approximately 0.1 to 1 percent of the Far Infra Red (FIR) luminosity of the nuclear regions of galaxies; the (CII) line is formed in the warm (temperature of the gas is greater than 200 K), dense (nH greater than 1000/cu cm) photodissociated gas at the interfaces between giant molecular clouds and ionized gas regions and is therefore associated with the molecular gas component in spiral galaxies; the (CII) line tracks the FIR continuum in a manner consistent with the PDR models; the integrated (CII) to isotope (12)CO (transition 1 to 0) line ratio is large (greater than or equal to 1000) in all galaxies studied, and is similarly large for galactic molecular clouds; the (CII) line is therefore energetically very important for the study of giant molecular clouds. Conclusions obtained from these results are given.
Geis Norbert
Genzel Reinhard
Lugten John B.
Poglitsch Albrecht
Stacey Gordon J.
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