Variation in the dust spectral index across M33

Using the Herschel PACS and SPIRE FIR/submm data, we investigate variations in the dust spectral index β in the nearby spiral galaxy M33 at a linear resolution of 160 pc. We use an iteration method in two different approaches, single and two-component modified black body models. In both approaches,...

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Bibliographic Details
Published inProceedings of the International Astronomical Union Vol. 7; no. S284; pp. 125 - 127
Main Authors Tabatabaei, Fatemeh S., Braine, Jonathan, Kramer, Carsten, Xilouris, Manolis, Boquien, Mederic, Verley, Simon, Schinnerer, Eva, Calzetti, Daniela, Combes, Francoise, Israel, Frank, Henkel, Christian
Format Journal Article Conference Proceeding
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.09.2011
Cambridge University Press (CUP)
Subjects
Astronomy
Astrophysics
Contributed Papers
Cosmology
Monte Carlo simulation
Physics
Sciences of the Universe
Solar and Stellar Astrophysics
Star & galaxy formation
Interstellar Medium
Galaxies: M33
Dust
Star formation
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Summary:Using the Herschel PACS and SPIRE FIR/submm data, we investigate variations in the dust spectral index β in the nearby spiral galaxy M33 at a linear resolution of 160 pc. We use an iteration method in two different approaches, single and two-component modified black body models. In both approaches, β is higher in the central disk than in the outer disk similar to the dust temperature. There is a positive correlation between β and Hα as well as with the molecular gas traced by CO(2-1). A Monte-Carlo simulation shows that the physical parameters are better constrained when using the two-component model.
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ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921312008885