Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-19
Infrared and Submillimeter Astronomy. M. Giard, J.P. Bernard, A. Klotz and I. Ristorcelli (eds) EAS Publications Series, Vol.
Astronomy and Astrophysics
Astrophysics
4 pages, 4 postscript figures. Proceedings of "Infrared and Submillimeter Astronomy. An International Colloquium to Honor the
Scientific paper
We are modeling the spectra of dwarf galaxies from infrared to submillimeter wavelengths to understand the nature of the various dust components in low-metallicity environments, which may be comparable to the ISM of galaxies in their early evolutionary state. The overall nature of the dust in these environments appears to differ from those of higher metallicity starbursting systems. Here, we present a study of one of our sample of dwarf galaxies, NGC 1569, which is a nearby, well-studied starbursting dwarf. Using ISOCAM, IRAS, ISOPHOT and SCUBA data with the Desert et al. (1990) model, we find consistency with little contribution from PAHs and Very Small Grains and a relative abundance of bigger colder grains, which dominate the FIR and submillimeter wavelengths. We are compelled to use 4 dust components, adding a very cold dust component, to reproduce the submillimetre excess of our observations.
Bernard J.-Ph.
Galliano Frederic
Jones Adrian P.
Le Peintre F.
Madden Suzanne C.
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