Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-09
Astronomy and Astrophysics
Astrophysics
8 pages, 5 figures, to be published in the proceedings of ``ISO Surveys of a Dusty Universe'', Ringberg, Germany, November 8-1
Scientific paper
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 10$^{10}$~ $<$ ~L$_{FIR}$ ~$<$ ~10$^{11}$ L$\odot$. 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.
Appleton Phil N.
Charmandaris Vassilios
Horellou Cathy
Laurent Olivier
Mirabel Felix I.
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