Dust in early-type galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Elliptical Galaxies, Radio Galaxies, Active Galactic Nuclei, Astronomical Photography, Infrared Astronomy Satellite, Thermal Emission

Scientific paper

The present study finds no clear evidence that radio galaxies contain dust more frequently than radio-quiet galaxies. While the galaxies detected at 100 microns by IRAS exhibit clear evidence for dust on direct images, indicating that the IR emission must be due to the dust's thermal emission, galaxies with an active nucleus may have a detectable FIR flux; in such a case, the IR emission would be associated with the activity of the nucleus.

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