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Issue A&A
Volume 406, Number 3, August II 2003
Page(s) 867 - 877
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20030799



A&A 406, 867-877 (2003)
DOI: 10.1051/0004-6361:20030799

Mid-IR emission of galaxies in the Virgo cluster III. The data

A. Boselli1, M. Sauvage2, J. Lequeux3, A. Donati4 and G. Gavazzi4

1  Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12, France
    e-mail: Alessandro.Boselli@oamp.fr
2  DSM/DAPNIA/Service d'Astrophysique, CEA/Saclay, 91191 Gif-sur-Yvette, France
    e-mail: msauvage@cea.fr
3  DEMIRM and URA 336 du CNRS, Observatoire de Paris, 61 Av. de l'Observatoire, 75014 Paris, France
    e-mail: James.Lequeux@obspm.fr
4  Università degli Studi di Milano-Bicocca, Dipartimento di Fisica, Piazza dell'Ateneo Nuovo 1, 20126 Milano, Italy
    e-mail: Alessandro.Donati@mib.infn.it;Giuseppe.Gavazzi@mib.infn.it

(Received 1 October 2002 / Accepted 16 May 2003)

Abstract
We present ISOCAM imaging data at 6.75 and 15 $\mu$m for 145 galaxies in the Virgo cluster and in the Coma/A1367 supercluster. Of these, 99 form a complete, optically-selected, volume-limited sample including galaxies in the core and in the periphery of the Virgo cluster, suitable for statistical analysis. 34 of the Virgo galaxies were resolved by ISOCAM: for these objects we present mid-IR images, radial light and colour profiles, as well as effective and isophotal radii, surface brightness and light concentration indices. The mid-IR colours of the target galaxies show a weak trend with the H band luminosity, with values of F(6.75  $\mu$m)/ F(15  $\mu$m)  $\ge$ 1 found generally in massive objects ( $L_H\ge 10^{10}$ $L_{H\odot}$), and F(6.75  $\mu$m)/ F(15  $\mu$m)  $\le$ 1 in low-mass ( LH $\le$ 10 10 $L_{H\odot}$) dwarf galaxies. All early-type galaxies (type $\le$ S0a) have F(6.75  $\mu$m)/ F(15  $\mu$m)  $\ge$ 1, as expected when the mid-IR emission is dominated by the photosphere of the cold stellar population. The mid-IR, near-IR and visible light concentration indices of bright galaxies are tightly correlated with one another, indicating that the spatial distribution of the mid-IR emitting sources is, to the first order, similar to that of the stars.


Key words: galaxies: general -- galaxies: spiral -- galaxies: ISM -- stars: formation

Offprint request: A. Boselli, Alessandro.Boselli@oamp.fr

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