Smoke in the "Smoke Rings'': ISO Observations of Dust in Collisional Ring Galaxies

2000 • 2000LNP...548..232A

Authors • Appleton, Philip N. • Charmandaris, Vassilis • Horellou, Cathy • Mirabel, I. Felix • Laurent, Olivier

Abstract • Collisional ring galaxies probably result from a head-on collision between a compact companion galaxy and a gas-rich disk system. We present a review of the discovery of warm dust in five collisional rings observed by ISO which range in total Far-IR luminosity from 10¹⁰ < L_FIR < 10¹¹ L. The results show that in most cases, the mid-IR (MIR) flux is often a significant fraction of the total energy budget of star formation activity in these galaxies (at least 10% even in the least powerful cases). We argue that the MIR emission, when combined with optical and radio observations, allows us to build a more complete picture of activity in these collisional systems. Although not as extreme as ULIRGs, these collisional systems provide low-redshift examples of the early effects of galaxy collisions on the ISM and may be relevant to the collisional assembly of galaxy disk components at high redshift.

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Phil Appleton

Senior Scientist