Survey of the ISM in early-type galaxies

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Abstract
We present mid-IR photometric properties for a sample of 28 early-type galaxies observed at 6.75, 9.63 and 15 m with the ISOCAM instrument on board the ISO satellite. We find total mid-IR luminosities in the range . The spectral energy distributions (SED) of the galaxies were derived using the mid-IR data together with previously published UV, optical and near-IR data. These SEDs clearly show a mid-IR emission coming from dust heated at K. Dust grains properties are inferred from the mid-IR colors. The masses of the hot dust component are in the range . The relationship between the masses derived from mid-IR observations and those derived from visual extinction are discussed. The possible common heating source for the gas and dust is investigated through the correlations between and mid-IR luminosities.
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