F. S. Tabatabaei, J. Braine, C. Kramer, M. Xilouris, M. Boquien, S. Verley, E. Schinnerer, D. Calzetti, F. Combes, F. Israel, C. Henkel, The HerM33es Team
Using the Herschel PACS and SPIRE FIR/submm data, we investigate variations
in the dust spectral index $\beta$ 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,
$\beta$ is higher in the central disk than in the outer disk similar to the
dust temperature. There is a positive correlation between $\beta$ and Halpha 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.
View original:
http://arxiv.org/abs/1111.6740
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