Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..275b&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
1
Scientific paper
This paper investigates dust properties in the Small Magellanic Cloud (SMC). For this study,the IRAS maps at 12, 25, 60 and 100 μm were complemented with a 170 μm map build from the ISOPHOT data, retrieved from the ISO data archive.
The comparison at 170 μm and 100 μm data leads to a mean equilibrium temperature of 25.5 K for the SMC dust. This temperature implies a mean interstellar radiation field for the SMC ten times greater than for the solar neighbourhood.
ATCA/Parkes combined data were used to compare the dust spatial distribution with the one of neutral hydrogen. There is a tight spatial correlation between dust far infra-red brightness and hydrogen column density, from which we derive the mean dust emissivity per hydrogen atom: ɛ(λ)/H= 2\cdot 10-27 (λ/250μ m)-2cm2, fifty times lower than in the solar neighbourhood. This difference is larger than that on the metallicity, which implies a lower depletion than in the Galaxy.
Within the bar, excess in infra-red emission with respect to dust emission in the neutral hydrogen are observed. They can be understood as emission from dust associated with cold H I and molecular gas.
Bot Caroline
Boulanger Francois
Okumura Koryo
Stepnik Bertrand
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