SIMBAD references

We present ISOCAM imaging data at 6.75 and 15µm 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(6.75µm)/F(15µm)≥1 found generally in massive objects (L_H≥10¹⁰L_H☉), and F(6.75µm)/F(15µm)≤1 in low-mass (L_H≤10¹⁰L_H☉) dwarf galaxies. All early-type galaxies (type ≤S0a) have F(6.75µm)/F(15µm)≥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.