Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-11-08
Astronomy and Astrophysics
Astrophysics
11 pages plain TeX, 5 figures not included but available by request to hutchngs@dao.nrc.ca To appear in the Astronomical Journ
Scientific paper
10.1086/117817
Images of IRAS galaxies with a range of IR properties are examined for bright knots, both within and outside the galaxy. These are found almost exclusively in galaxies with steep IR spectra, but over a wide range of IR luminosity, and usually without strong nuclear activity. In most cases, the knots are likely to be star-formation induced by tidal interactions, and are seen in the early stages of such interactions. Detailed photometry is presented of knots in six representative galaxies. The knots appear to have a wide range of colour and luminosity, but it is argued that many are heavily reddened. Knots formed outside the parent galaxy may be a new generation of what later become globular clusters, but they appear to have a wide range of luminosities.
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