Issue |
A&A
Volume 401, Number 3, April III 2003
|
|
---|---|---|
Page(s) | 873 - 893 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20021837 | |
Published online | 01 April 2003 |
The Small Magellanic Cloud in the far infrared *,**
I. ISO's 170 μm map and revisit of the IRAS 12–100 μm data
Max-Planck-Institut für Astronomie, Königstuhl, 69117 Heidelberg, Germany
Corresponding author: K. Wilke, wilke@mpia.de
Received:
30
September
2002
Accepted:
10
December
2002
The ISOPHOT experiment onboard the
ISO satellite
generated a complete view of the Small Magellanic Cloud (SMC) at
170 μm with 1.5 arcmin resolution.
The map is analysed
using an automated photometry program enabling accurate photometric
characterization of the far infrared (FIR) emitting regions.
An integrated FIR luminosity of is obtained, leading to a star
formation rate of
. With an
average dust temperature of
, the total dust mass follows
to
.
In this paper, the sources detected at 170 μm are compared with those obtainable from
the IRAS satellite data. For this purpose, the 12 μm, 25 μm, 60 μm, and 100 μm IRAS
high resolution (HiRes) maps of the SMC are re-examined using the same
method. In contrast to former studies,
this provides an all-band ISO/IRAS source catalog which is no
longer based on eyeball classification,
but relies on an algorithm which is capable of
automated, repeatable photometry, even for irregular sources.
In the mid infrared IRAS bands
numerous bright FIR emitting regions in the SMC are detected
and classified: 73 sources are found at 12 μm, 135 at 25 μm
(most of them with
).
All three FIR bands at 170 μm, 100 μm, and 60 μm reproduce the overall
morphological structure of the SMC similarly well, in contrast to the
12 μm and 25 μm maps which only contain a limited number of
extended sources and do not trace the main body of the SMC.
243 sources are detected in the
ISO 170 μm map, 155 of them with
.
Comparable numbers are found for the two FIR IRAS maps at 60 μm
(384) and 100 μm (338) with fluxes up to
. 70 of the 243
170 μm sources are assigned a general SED type (“cold”, “warm”, i.e.,
,
)
for the first time.
A comparison with earlier IRAS results suggests that
many source flux densities in those studies have been under- or
overestimated
because of non-standardized fitting methods. Many
sources with flux densities up to 40 Jy listed in former catalogs
cannot be identified in our
data.
Key words: galaxies: magellanic clouds / ISM: general / ISM: dust, extinction
© ESO, 2003
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