The IRAS Bright Galaxy Sample. III - 1-10 micron observations and coadded IRAS data for galaxies with L(IR) equal to or greater than 10 to the 11th solar luminosities

Details The IRAS Bright Galaxy Sample. III - 1-10 micron observations and coadded IRAS data for galaxies with L(IR) equal to or greater than 10 to the 11th solar luminosities The IRAS Bright Galaxy Sample. III - 1-10 micron observations and coadded IRAS data for galaxies with L(IR) equal to or greater than 10 to the 11th solar luminosities

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..356c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, Feb. 1988, p. 356-373. NSF-NASA-supported research.

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79

Astronomical Spectroscopy, Brightness Distribution, Galactic Structure, Infrared Spectra, Radiant Flux Density, Cosmic Dust, Far Infrared Radiation, Star Formation, Temperature Distribution

Scientific paper

Galaxies from the IRAS Bright Galaxy Sample with infrared luminosities LIR ≥ 1011L_sun; have been measured at 1.3, 1.6, 2.2, 3.7 and 10 μm. In addition, coadded IRAS measurements at all four IRAS bands have been obtained. It is found that an increase in the total infrared luminosity above LIR ≥ 1011L_sun; is correlated with increased emission from hot dust with characteristic temperatures ≡800K contributing a substantial fraction of the 2.2 and 3.7 μm emission. The far-infrared emission cannot be modeled with a single dust temperature, but requires a cold (T ≡ 30 - 50K) component coupled with a warmer (T ⪆ 70K) component. The fν(12 μm)/fν(25 μm) ratios for the galaxies in this sample are small compared with other extragalactic objects, indicating that the radiation at 12 and 25 μm is dominated by emission from large dust grains radiating at high temperatures, rather than PAHs. The spatial distribution of the 10 μm emission indicates a substantial extended component for most of the galaxies in this sample, implying that star-formation processes contribute significantly to the luminosities.

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