2017A&A...599A..64V


Query : 2017A&A...599A..64V

2017A&A...599A..64V - Astronomy and Astrophysics, volume 599A, 64-64 (2017/3-1)

The Herschel Exploitation of Local Galaxy Andromeda (HELGA). VII. A SKIRT radiative transfer model and insights on dust heating.

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., FERNANDEZ-ONTIVEROS J.A., FRITZ J., GALAMETZ M., GENTILE G., MADDEN S., SMITH M.W.L., SPINOGLIO L. and VERSTOCKEN S.

Abstract (from CDS):

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 10kpc. 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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: individual: M 31 - galaxies: ISM - infrared: ISM - galaxies: fundamental parameters - dust, extinction - radiative transfer - radiative transfer

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1268 1
2 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2094 2
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11879 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10311 1
5 NAME SMC Bar PoG 01 05 -72.6           ~ 214 0
6 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4098 4
7 NAME Local Group GrG ~ ~           ~ 7715 0

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2022.08.09-04:32:39

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