Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3084...40l&link_type=abstract
In its The Interstellar Medium in External Galaxies: Summaries of Contributed Papers p 40-41 (SEE N91-14100 05-90)
Physics
Emission Spectra, Far Infrared Radiation, Far Ultraviolet Radiation, Galaxies, H Ii Regions, Interstellar Matter, Kuiper Airborne Observatory, Photodissociation, Spectroscopy, Background Radiation, Excitation, Mathematical Models, Monatomic Gases, Spectrometers
Scientific paper
Researchers investigated the physical conditions in the infrared bright galaxies NGC 6946, IC 342, and Arp 299 through measurements of far-infrared emission lines from Si II, O I, C II, and O III using the facility Cooled Grating Spectrometer on the Kuiper Airborne Observatory. These data are interpreted using our theoretical models for photodissociation regions and H II regions. For the central 45 inches of these galaxies, researchers determined that the dominant excitation mechanism for the far infrared radiation (FIR) lines is far ultraviolet radiation (FUR) radiation from young stars, and the authors derived the total mass, density, and temperature of the warm atomic gas and the typical sizes, number densities, and filling factors for the interstellar clouds.
Colgan Sean J. W.
Erickson Edwin F.
Haas Michael R.
Hollenbach David J.
Lord Steven D.
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