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Astron. Astrophys. 330, L5-L8 (1998)

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Letter to the Editor

ISOCAM images at 6.75 µm and 15 µm:
the circumnuclear region of NGC 4321 (M 100) *

H. Wozniak 1, D. Friedli 2, 3, L. Martinet 3 and D. Pfenniger 3

1 IGRAP/Observatoire de Marseille, F-13248 Marseille Cedex 4, France
2 Département de Physique and Observatoire du Mont Mégantic, Université Laval, Québec, QC, G1K 7P4, Canada
3 Observatoire de Genève, CH-1290 Sauverny, Switzerland

Received 5 September 1997 / Accepted 18 September 1997


We present ISOCAM images (1.5 " px-1) in the LW2 (6.75 µm) and LW3 (15 µm) broad band filters of the circumnuclear starburst of NGC 4321 (M 100). A detailed comparison with the emission at other wavelengths (U, B, H [FORMULA], and CO) is also presented. The nature and intensity of the mid-infrared emission is shown to be remarkably different from one star forming region to the next. For instance, star forming regions at the ends of the nuclear bar may contain enshrouded Wolf-Rayet stars.

Key words: galaxies: individual: NGC 4321, M 100 – galaxies: ISM – galaxies: starburst – infrared: galaxies

* Based on observations with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) on board ISO, an ESA project with the participation of ISAS and NASA.

Send offprint requests to: wozniak@observatoire.cnrs-mrs.fr

© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998