Dust in early-type galaxies

Details Dust in early-type galaxies Dust in early-type galaxies

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204...28v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 28-38.

Astronomy and Astrophysics

Astronomy

65

Cosmic Dust, Elliptical Galaxies, Galactic Evolution, Interstellar Matter, Infrared Astronomy, Radio Galaxies

Scientific paper

The authors have looked for dust in a complete sample of 78 early-type galaxies by comparison of blue and near-infrared CCD frames. Eighteen galaxies (23%) from this sample are now known to contain dust at the level of 104M_sun;. There is no evidence that radio galaxies contain dust more often that radio-quiet galaxies. On the other hand, most galaxies with dust are detected at 100 μm by IRAS, the infrared emission being the thermal emission of the cold dust seen on the direct images. Two galaxies detected by IRAS and showing no dust are "active" galaxies: NGC 4486 with its well known jet and NGC 7213, a Seyfert 1 galaxy; in these cases, the infrared emission could be related to this activity rather than due to dust.

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