The Small Magellanic Cloud in the Far Infrared: new ISO results

Details The Small Magellanic Cloud in the Far Infrared: new ISO results The Small Magellanic Cloud in the Far Infrared: new ISO results

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..235w&link_type=abstract

Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by

Astronomy and Astrophysics

Astronomy

Scientific paper

For the first time, ISOPHOT generated a complete view of the Small Magellanic Cloud (SMC) at 170μm with 1.5 arc-min resolution. The map is analysed using an automated photometry program enabling accurate photometric characterization of the far infrared (FIR) emitting regions. In order to compare the detected sources with those obtainable from the IRAS satellite data, the 12μm, 25μm, 60μm, and 100μm IRAS high resolution 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 of irregular sources. The color temperature obtained from a 170μm/100μm map suggests an average dust temperature of TD=20.5K. All three FIR bands at 170μm, 100μm, and 60μm reproduce the overall morphological structure of the SMC similarly well, in contrast to the 12μm and 25μm maps which only contain a limited number of extended sources, but do not trace the main body of the SMC. 243 sources are detected in the in the ISO 170μm map, 155 of them with Fν>= 2.0Jy. Comparable numbers are found for the two FIR IRAS maps at 60μm (384) and 100μm (338) with flux densities up to 450Jy. 70 of the 243 170μm sources are assigned a general SED type (``cold'', ``warm'', i.e., <30K, >30K) for the first time. Remarkably, many sources with flux densities up to 40 Jy listed in former catalogs cannot be identified in our data.

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