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Astron. Astrophys. 315, L141-L144 (1996)

ISOCAM 4img1.gif imaging of the nuclear starburst in M83*

D. Rouan1, D. Tiphène1, F. Lacombe1, O. Boulade2, J. Clavel3, P. Gallais2, L. Metcalfe3, A. Pollock3, and R. Siebenmorgen3

1 Observatoire de Paris-Meudon, Département Spatial, CNRS, F-92195 Meudon Cedex, France
2 CEA Service d'Astrophysique, CEN Saclay, F-91191 Gif-sur-Yvette, France
3 ISO SOC, ESA, Villafranca, P.O. Box 50727, E-28080 Madrid, Spain

Received 18 July 1996 / Accepted 19 August 1996

Abstract. We present ISOCAM images (1.5 arcsec resolution), in the Br img2.gif line and in the continuum at 4 img1.gif , of the starburst nuclear region in the nearby galaxy M83. The starburst is found to lie: a) along arc joining the 2 img1.gif sources at S and SW of the nucleus to the NW 10 img1.gif 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 4 img1.gif continuum emission cannot be free-free and probably corresponds to the continuum emission associated with the Very-Small-Grain/PAH component of the dust.

Key words: galaxies: individual: M83 - galaxies: starburst - infrared: ISM: continuum, lines and bands

* ISO is an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA. We thank all the members of the ISOCAM team for their unvaluable work, with a special mention to M. Arfouillaud, G. Epstein, R. Knoll, J.P. Mengué, P. Puget, J.P. Rivet, D. Stefanovitch, B. Talureau, P. van Duoc who have been deeply involved in the development of the CAM-SW channel.

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