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Far-infrared spectroscopy of NGC 6946, IC 342, and Arp 299Researchers 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.
Document ID
19910004801
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lord, Steven D. (NASA Ames Research Center Moffett Field, CA., United States)
Hollenbach, David J. (NASA Ames Research Center Moffett Field, CA., United States)
Colgan, Sean W. J. (California Univ. Santa Cruz., United States)
Haas, Michael R. (NASA Ames Research Center Moffett Field, CA., United States)
Rubin, Robert H. (NASA Ames Research Center Moffett Field, CA., United States)
Erickson, Edwin F. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1990
Publication Information
Publication: The Interstellar Medium in External Galaxies: Summaries of Contributed Papers
Subject Category
Astrophysics
Accession Number
91N14114
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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