Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..766s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Sept. 1989, p. 766-797. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
354
Astronomical Catalogs, Galactic Radiation, Infrared Astronomy, Radiant Flux Density, Cosmic Dust, Data Sampling, Infrared Astronomy Satellite, Infrared Sources (Astronomy)
Scientific paper
Total flux densities, peak flux densities, and spatial extents at 12, 25, 60, and 100 microns are presented for the 330 sources in the IRAS Bright Galaxy Sample. The flux density ratios Snu (60 microns)/Snu (100 microns) and Snu (12 microns)/Sn (25 microns) are found to correlate with both the infrared luminosity and the ratio of IR to visible flux. The relation between these two flux density ratios is shown to follow that found previously, with different slopes appearing for the warmer and colder galaxies in the sample. The results suggest that single photon heating of small grains (often the dominant source of 12 and 25 micron radiation from galaxies) significantly affects the emission of some galaxies at 60 microns, and that optical depth effects may alter the emergent radiation at 12 and 25 microns.
Boehmer Lisa
Neugebauer Gernot
Sanders David B.
Soifer Thomas B.
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