ISOCAM 4µm imaging of the nuclear starburst in M 83.
Rouan, D.; Siebenmorgen, R.; Clavel, J.; Metcalfe, L.; Gallais, P.; Boulade, O.; Tiphene, D.; Pollock, A.; Lacombe, F.
Abstract
We present ISOCAM images (1.5arcsec resolution), in the Brα line and in the continuum at 4μm, of the starburst nuclear region in the nearby galaxy M 83. The starburst is found to lie: a) along arc joining the 2μm sources at S and SW of the nucleus to the NW 10μm peak, a possible indication of a propagating star formation; b) at the nucleus itself and at a bridge, linking the arc to the nucleus, that could trace a gaseous bar. The strong 4μm continuum emission cannot be free-free and probably corresponds to the continuum emission associated with the Very-Small-Grain/PAH component of the dust.