IAU Symposium Abstract S186-079P

Star-forming Activity in the Arp-Madore Galaxies

A. M. Hopkins1 and L. E. Cram2
1School of Physics, University of Sydney, Australia < A.Hopkins@physics.usyd.edu.au >
2School of Physics, University of Sydney, Australia < L.Cram@physics.usyd.edu.au >

We have explored the relationship between star-forming activity and the presence of peculiar morphology in galaxies by comparing the far infrared (IRAS) flux of the Arp-Madore peculiar galaxies with a control sample of 'normal' galaxies. Some 12.5% of the peculiar galaxies are found to have high levels of star-forming activity, compared with approximately 2% of the normal galaxies. Of the Arp-Madore morphology categories, the ones with the highest proportion of activity (such as M51-type systems with a companion located at the end of an arm) appear to be 'recent' or 'early' interactions. We discuss our results in the context of a proposed time sequencing of Arp-Madore types, related to theoretical predictions of the consequences of galaxy interactions over different time scales.