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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607402.0, MPI für Astronomie / Publikationen_mpia
Mapping the dust properties of nearby galaxies with Herschel and LABOCA
Authors:Galametz, M.; Albrecht, M.; Kennicutt, R.; Bertoldi, F.; Walter, F.; Weiss, A.; Dale, D.; Draine, B.; Aniano, G.; Engelbracht, C.; Hinz, J.; Roussel, H.; Belkacem, K.; Samadi, R.; Valls-Gabaud, D.
Publisher:French Society of Astronomy and Astrophysics
Date of Publication (YYYY-MM-DD):2011
Title of Proceedings:SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
Start Page:119
End Page:123
Name of Conference/Meeting:SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
Audience:Not Specified
Abstract / Description:We combine Spitzer, Herschel and LABOCA observations from 24 to 870 micron for 11 galaxies of the KINGFISH Herschel Key programme dedicated to the observations of 61 nearby galaxies of various metallicities and levels of star formation activity. We perform a global two-temperature fitting of the Spectral Energy Distributions of the galaxies to study the cold dust properties and probe the variations in the emissivity index of grains inferred by the use of submm data. Using the resolution of Spitzer and Herschel observations, we also produce dust temperature maps of the galaxies and perform a local study of the variations of cold dust properties within the galaxies. We finally build extrapolated maps at 870 micron and compare them with our LABOCA observations. Some of our galaxies exhibit an excess at 870 micron compared to fluxes inferred from the modeling. This excess decreases (and even disappears in some cases) when a lower emissivity index is used, for instance β=1.5 in lieu of the standard value of 2 commonly used in current SED models. The cause for such excess still has to be investigated.
Free Keywords:ISM; dust; submillimeter; Herschel; LABOCA; SED model
Comment of the Author/Creator:Date: 2011, December 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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