| Issue |
A&A
Volume 389, Number 2, July II 2002
|
|
|---|---|---|
| Page(s) | 355 - 366 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20020582 | |
| Published online | 27 June 2002 | |
Survey of the ISM in early-type galaxies*
IV. The hot dust component
1
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, ferrari@if.ufrgs.br
Received:
28
August
2001
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
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.