Volume 389, Number 2, July II 2002
|Page(s)||355 - 366|
|Section||Cosmology (including clusters of galaxies)|
|Published online||27 June 2002|
Survey of the ISM in early-type galaxies*
IV. The hot dust component
Instituto de Fisica, UFRGS, Porto Alegre, Brazil
2 Space Telescope Science Institute
3 On assignment from the Space Science Department of ESA
Corresponding author: F. Ferrari, email@example.com
Accepted: 15 April 2002
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.
Key words: galaxies: elliptical and lenticular, cD / ISM: general
© ESO, 2002
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