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  • 1
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    Ultraluminous infrared galaxies (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The IRAS survey of the local universe has revealed the existence of a class of ultraluminous infrared galaxies with L(8 to 1000 micrometer) greater than 10 to the 12th L sub 0 that are slightly more numerous, and as luminous as optically selected quasars at similar redshift. Optical CCD images of these infrared galaxies show that nearly all are advanced mergers. Millimeter wave CO observations indicate that these interacting systems are extremely rich in molecular gas with total H2 masses 1 to 3 x 10 to the 10th power M sub 0. Nearly all of the ultraluminous infrared galaxies show some evidence in their optical spectra for nonthermal nuclear activity. It is proposed that their infrared luminosity is powered by an embedded active nucleus and a nuclear starburst both of which are fueled by the tremendous reservoir of molecular gas. Once these merger nuclei shed their obscuring dust, allowing the AGN to visually dominate the decaying starburst, they become the optically selected quasars.
    Keywords: ASTRONOMY
    Type: NASA, Washington Star Formation in Galaxies; p 411-420
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The luminosity function of the brightest galaxies in the IRAS survey (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Results from a study of the far infrared properties of the brightest galaxies in the IRAS survey are described. There is a correlation between the infrared luminosity and the infrared to optical luminosity ratio and between the infrared luminosity and the far infrared color temperature in these galaxies. The infrared bright galaxies represent a significant component of extragalactic objects in the local universe, being comparable in space density to the Seyferts, optically identified starburst galaxies, and more numerous than quasars at the same bolometric luminosity. The far infrared luminosity in the local universe is approximately 25% of the starlight output in the same volume.
    Keywords: ASTRONOMY
    Type: NASA, Washington Star Formation in Galaxies; p 523-530
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Near-infrared observations of IRAS minisurvey galaxies (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Near infrared photometry at J, H, and K was obtained for 82 galaxies from the IRAS minisurvey. The near infrared colors of these galaxies cover a larger range in J-H and H-K than do normal field spiral galaxies, and evidence is presented of a tighter correlation between the near and far infrared emission in far infrared bright galaxies than exists between the far infrared and the visible emission. These results suggest the presence of dust in the far infrared bright galaxies, with hot dust emission contributing to the 2.2 micron emission, and extinction by dust affecting both the near infrared colors and the visible luminosities. In addition, there is some indication that the infrared emission in many of the minisurvey galaxies is coming from a strong nuclear component.
    Keywords: ASTRONOMY
    Type: NASA, Washington Star Formation in Galaxies; p 601-604
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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