Near-infrared observations of IRAS minisurvey galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Galactic Radiation, Line Spectra, Near Infrared Radiation, Spiral Galaxies, Cosmic Dust, Infrared Astronomy Satellite, Stellar Color, Stellar Luminosity, Stellar Temperature

Scientific paper

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.

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