Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-08-17
Astrophys.Space Sci. 269 (1999) 349-355
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figures, Conference in Johannesburg, South Africa, September 13-18 1999. To be published as a special issue of the
Scientific paper
10.1023/A:1017049030679
We present some highlights from the mid-infrared (5-16 micron) images of mergers of massive galaxies obtained with the Infrared Space Observatory (ISO). We have observed: 1) ultraluminous infrared nuclei, 2) luminous dust-enshrouded extranuclear starbursts, and 3) active galaxy nuclei (AGNs). In this contribution we discuss the observations of Arp 299, a prototype for very luminous infrared galaxies, the Antennae which is a prototype of mergers, and Centaurus A which is the closest AGN to Earth. From these observations we conclude the following: 1) the most intense starbursts in colliding systems of galaxies and the most massive stars are dust-enshrouded in regions that appear inconspicuous at optical wavelengths, 2) the most intense nuclear infrared sources are a combination of AGN and starburst activity, 3) the hosts of radio loud AGNs that trigger giant double-lobe structures may be symbiotic galaxies composed of barred spirals inside ellipticals.
Laurent Olivier
Mirabel Felix I.
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