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For refcode 1989MNRAS.240..329L:
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NED Abstract

Copyright by Royal Astronomical Society. 1989MNRAS.240..329L High-luminosity IRAS galaxies - I. The proportion of IRAS galaxies in interacting systems A. Lawrence, M. Rowan-Robinson and K. Leech Astronomy Unit, School of Mathematical Sciences, Queen Mary Collage, Mile End Road, London E1 4NS D. H. P. Jones and J. V. Wall Royal Greenwich Observatory, Herstmonceux Castle, Hailsham, Sussex BN27 1RP Accepted 1989 March 3. Received 1989 March 3; in original form 1988 October 10 Summary. We report CCD imaging of a complete sample of 60 high-luminosity IRAS galaxies (selected as a subset of the redshift survey by Lawrence et al.), and of a control sample of 87 optically selected galaxies from the Durham redshift survey. The galaxies have been grouped in seven classes depending on the presence or absence of faint or bright, nearby or distant, companions, and signs of interaction or mergers such as tidal arms or disturbed structure. We find that 18 +/- 5 per cent of optically selected galaxies are in interacting or merging systems. The proportion of low-luminosity (< 10^11^ L_sun_) IRAS galaxies which are interacting or merging, 11 +/- 8 per cent (2/19), is consistent with this. At high luminosities (> 10^11^ L_sun_) the proportion is 46 +/- 12 per cent (19/41). The excess of interacting pairs over those which we would expect to find by chance is therefore about 30 per cent. Many of the pairs are unresolved by the IRAS beam, but we demonstrate that this cannot explain the enhanced fraction of pairs. These results indicate that galaxy interaction is a common causal factor in luminous IR activity, but also that it is far from being the ubiquitous factor suggested in several recent reports.
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