Dissecting the Spiral Galaxy M83: Mid-Infrared Emission And
Astronomy & Astrophysics manuscript no. m83.paper.astroph May 6, 2019 (DOI: will be inserted by hand later) Dissecting the spiral galaxy M 83: mid-infrared emission and comparison with other tracers of star formation⋆ A. Vogler1, S. C. Madden1, R. Beck2, A.A. Lundgren3,4, M. Sauvage1, L. Vigroux1 and M. Ehle5 1 DSM/DAPNIA/Service d’Astrophysique, CEA/Saclay, 91191, Gif-sur-Yvette Cedex, France 2 Max-Planck-Institut f¨ur Radioastronomie, Auf dem H¨ugel 69, 53121 Bonn, Germany 3 European Southern Observatory, Casilla 19001, Santiago 19, Chile 4 Stockholm Observatory, AlbaNova, 106 91 Stockholm, Sweden 5 XMM-Newton Science Operations Centre, European Space Agency, Villafranca, PO Box 50727, 28080 Madrid, Spain Accepted July 7, 2005 Abstract. We present a detailed mid-infrared study of the nearby, face-on spiral galaxy M 83 based on ISOCAM data. M 83 is a unique case study, since a wide variety of MIR broad-band filters as well as spectra, covering the wavelength range of 4 to 18 µm, were observed and are presented here. Emission maxima trace the nuclear and bulge area, star-formation regions at the end of the bar, as well as the inner spiral arms. The fainter outer spiral ′ ′ arms and interarm regions are also evident in the MIR map. Spectral imaging of the central 3 × 3 (4kpc × 4kpc) field allows us to investigate five regions of different environments. The various MIR components (very small grains, polycyclic aromatic hydrocarbon (PAH) molecules, ionic lines) are analyzed for different regions throughout the galaxy. In the total λ4 µm to 18 µm wavelength range, the PAHs dominate the luminosity, contributing between 60% in the nuclear and bulge regions and 90% in the less active, interarm regions.
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