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The Herschel exploitation of local galaxy Andromeda (HELGA)

Viaene, S., Baes, M., Tamm, A., Tempel, E., Bendo, G., Blommaert, J. A. D. L., Boquien, M., Boselli, A., Camps, P., Cooray, A., De Looze, I., De Vis, P., Fernández-Ontiveros, J. A., Fritz, J., Galametz, M., Gentile, G., Madden, S., Smith, Matthew, Spinoglio, L. and Verstocken, S. 2017. The Herschel exploitation of local galaxy Andromeda (HELGA). Astronomy and Astrophysics 599 , A64. 10.1051/0004-6361/201629251

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Abstract

The radiation from stars heats dust grains in the diffuse interstellar medium and in star-forming regions in galaxies. Modelling this interaction provides information on dust in galaxies, a vital ingredient for their evolution. It is not straightforward to identify the stellar populations heating the dust, and to link attenuation to emission on a sub-galactic scale. Radiative transfer models are able to simulate this dust-starlight interaction in a realistic, three-dimensional setting. We investigate the dust heating mechanisms on a local and global galactic scale, using the Andromeda galaxy (M 31) as our laboratory. We have performed a series of panchromatic radiative transfer simulations of Andromeda with our code SKIRT. The high inclination angle of M 31 complicates the 3D modelling and causes projection effects. However, the observed morphology and flux density are reproduced fairly well from UV to sub-millimeter wavelengths. Our model reveals a realistic attenuation curve, compatible with previous, observational estimates. We find that the dust in M 31 is mainly (91% of the absorbed luminosity) heated by the evolved stellar populations. The bright bulge produces a strong radiation field and induces non-local heating up to the main star-forming ring at 10 kpc. The relative contribution of unevolved stellar populations to the dust heating varies strongly with wavelength and with galactocentric distance. The dust heating fraction of unevolved stellar populations correlates strongly with NUV−r colour and specific star formation rate. These two related parameters are promising probes for the dust heating sources at a local scale.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 16 August 2017
Date of Acceptance: 26 September 2016
Last Modified: 17 Aug 2017 12:00
URI: http://orca.cf.ac.uk/id/eprint/103668

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