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Survey of the ISM in Early-Type Galaxies. IV. The Hot Dust Component | | F. Ferrari
; M.G. Pastoriza
; F.D. Macchetto
; C. Bonatto
; N. Panagia
; W. B. Sparks .
; | | Date: |
18 Apr 2002 | | Subject: | astro-ph | | Affiliation: | 1,2), M.G. Pastoriza (1,2), F.D. Macchetto (3,4), C. Bonatto (1,2), N. Panagia , W. B. Sparks . ( IF-UFRGS, Brasil CNPq fellow Space Telescope Science Institute Space Science, Department of ESA | | Abstract: | We present mid-IR photometric properties for a sample of 28 early-type galaxies observed at 6.75, 9.63 and 15 um with the ISOCAM instrument on board the ISO satellite. We find total mid-IR luminosities in the range 3-48x10^8 L_sun. The spectral energy distribution (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 T ~ 260 K. Dust grains properties are inferred from the mid-IR colors. The masses of the hot dust component are in the range 10-400 M_sun. 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 Ha and mid-IR luminosities. | | Source: | arXiv, astro-ph/0204318 | | Services: | Forum | Review | PDF | Favorites | |
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