Volume 406, Number 3, August II 2003
|Page(s)||867 - 877|
|Published online||17 November 2003|
Mid-IR emission of galaxies in the Virgo cluster III. The data*
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: firstname.lastname@example.org
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
Corresponding author: A. Boselli, Alessandro.Boselli@oamp.fr
Accepted: 16 May 2003
We present ISOCAM imaging data at 6.75 and 15 μm 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 μm)/F(15 μm) ≥ 1 found generally in massive objects ( ), and F(6.75 μm)/F(15 μm) ≤ 1 in low-mass (LH ≤ 1010 ) dwarf galaxies. All early-type galaxies (type ≤ S0a) have F(6.75 μm)/F(15 μm) ≥ 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
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.