Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..683b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. 683-688.
Astronomy and Astrophysics
Astronomy
24
Emission Spectra, Far Infrared Radiation, Inclination, Infrared Spectra, Line Of Sight, Spiral Galaxies, Astronomical Models, Astronomical Spectroscopy, Brightness Distribution, Galactic Structure, Infrared Astronomy Satellite, Radial Velocity, Spaceborne Astronomy
Scientific paper
A sample of 2000 Sc galaxies chosen from the UGC is used to show that the detection of Sc galaxies by IRAS is apparently a function of the inclination of a galaxy to the line of sight. Sc galaxies with axial ratios log(a/b) < 0.1 (face-on) are detected at a rate twice that of Sc galaxies with axial ratios log(a/b) > 0.7 (edge-on). The ratio of IRAS 100 μm flux to optical size, expressed as a hybrid "surface brightness" F100/a2, is a function of inclination, consistent with the difference in detection rates. In an attempt to interpret this effect, the authors conclude that spiral galaxies become optically thick at 100 μm when they are viewed at high angles of inclination. A simple model is proposed for the 60 and 100 μm emission from spiral galaxies that explains the observed infrared properties of galaxies. In its present form this model has far-reaching consequences for the interpretation of already published IRAS results, as well as serious consequences for future choices in the analysis of IRAS data on galaxies.
Burstein David
Lebofsky Marcia J.
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