The Mid-Infrared View of Star Formation in Collisional Ring Galaxies |
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| Authors: | V Charmandaris O Laurent IF Mirabel P Gallais M Sauvage L Vigroux C Cesarsky |
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| Institution: | (1) Observatoire de Paris, DEMIRM, France;(2) Cornell University, USA;(3) Service d'Astrophysique, CEA/DSM/DAPNIA, France |
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| Abstract: | We present mid-infrared images and spectra of Arp 10 and Arp 118, two collisional ring galaxies observed as part of the ISOCAM
GT program CAMACTIV (P.I.: I.F. Mirabel). The observations reveal the distribution of hot dust in the galaxies and enable
us to probe the mechanisms responsible for the heating of the ISM. Unlike the peculiar mid-infrared colours recently discovered
in the Cartwheel, the prime example of a collisional ring, Arp 10 has colours typical of those found inspiral arms of late
type spirals. Similarly for Arp 118 (NGC 1144),the mid-infrared emission is associated with the regions of star formation
in the ring. Moreover, a hot continuum in the 5.1–6.7 μmrange, which is a typical mid-infrared signature of an AGN, is clearly
detected from the Seyfert 2 nucleus of the galaxy.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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