The environmental dependence of far-infrared dust emissivity variations in M31
Abstract
In the framework of the Panchromatic Hubble Andromeda Treasury (PHAT) survey, we developed the Bayesian Extinction and Stellar Tool (BEAST), a probabilistic approach to modeling the dust attenuated photometric spectral energy distribution of an individual star (Gordon et al. 2015). Thus, we are able to infer the physical properties of every single source observed in the PHAT survey as well as constraining the extinction along each line of sight. The latter is of particular interest when studying the interstellar medium structure and the evolution of dust grains in a galaxy. Assuming a star geometry across M31, we build maps of both A(V) (dust surface density) and R(V) (grain size) parameters across large regions in M31. By combining these maps with the Herschel far-IR/submm emission maps, we highlight dust emissivity variations that are correlated with environment.
- Publication:
-
American Astronomical Society Meeting Abstracts #225
- Pub Date:
- January 2015
- Bibcode:
- 2015AAS...22545105A