Advanced search
1 file | 29.07 MB Add to list

High-resolution, 3D radiative transfer modelling, III : the DustPedia barred galaxies

Author
Organization
Abstract
Context: Dust in late-type galaxies in the local Universe is responsible for absorbing approximately one third of the energy emitted by stars. It is often assumed that dust heating is mainly attributable to the absorption of ultraviolet and optical photons emitted by the youngest (≤ 100 Myr) stars. Consequently, thermal re-emission by dust at far-infrared wavelengths is often linked to the star- formation activity of a galaxy. However, several studies argue that the contribution to dust heating by much older stellar populations might be more significant than previously thought. Advances in radiation transfer simulations finally allow us to actually quantify the heating mechanisms of diffuse dust by the stellar radiation field. Aims: As one of the main goals in the DustPedia project, we have developed a framework to construct detailed 3D stellar and dust radiative transfer models for nearby galaxies. In this study, we analyse the contribution of the different stellar populations to the dust heating in four nearby face-on barred galaxies: NGC 1365, M 83, M 95, and M 100. We aim to quantify the fraction directly related to young stellar populations, both globally and on local scales, and to assess the influence of the bar on the heating fraction. Methods. From 2D images we derive the 3D distributions of stars and dust. To model the complex geometries, we used SKIRT, a state-of-the-art 3D Monte Carlo radiative transfer code designed to self-consistently simulate the absorption, scattering, and thermal re-emission by the dust for arbitrary 3D distributions. Results: We derive global attenuation laws for each galaxy and confirm that galaxies of high specific star-formation rate have shallower attenuation curves and weaker UV bumps. On average, 36.5% of the bolometric luminosity is absorbed by dust in our galaxy sample. We report a clear effect of the bar structure on the radial profiles of the dust-heating fraction by the young stellar populations, and the dust temperature. We find that the young stellar populations are the main contributors to the dust heating, donating, on average ∼ 59% of their luminosity to this purpose throughout the galaxy. This dust-heating fraction drops to ∼ 53% in the bar region and ∼ 38% in the bulge region where the old stars are the dominant contributors to the dust heating. We also find a strong link between the heating fraction by the young stellar populations and the specific star-formation rate.
Keywords
SPECTRAL ENERGY-DISTRIBUTION, EDGE-ON GALAXIES, STAR-FORMATION, SPIRAL GALAXIES, NEARBY GALAXIES, MULTIPLE-SCATTERING, INFRARED-EMISSION, INTERSTELLAR DUST, CENTRAL REGION, CLUMPY MEDIA, radiative transfer, dust, extinction, galaxies: ISM, infrared: ISM

Downloads

  • published article.pdf
    • full text (Published version)
    • |
    • open access
    • |
    • PDF
    • |
    • 29.07 MB

Citation

Please use this url to cite or link to this publication:

MLA
Nersesian, Angelos, et al. “High-Resolution, 3D Radiative Transfer Modelling, III : The DustPedia Barred Galaxies.” ASTRONOMY & ASTROPHYSICS, vol. 637, 2020, doi:10.1051/0004-6361/201936176.
APA
Nersesian, A., Verstocken, S., Viaene, S., Baes, M., Xilouris, E., Bianchi, S., … Ysard, N. (2020). High-resolution, 3D radiative transfer modelling, III : the DustPedia barred galaxies. ASTRONOMY & ASTROPHYSICS, 637. https://doi.org/10.1051/0004-6361/201936176
Chicago author-date
Nersesian, Angelos, Sam Verstocken, Sébastien Viaene, Maarten Baes, EM Xilouris, S Bianchi, V Casasola, et al. 2020. “High-Resolution, 3D Radiative Transfer Modelling, III : The DustPedia Barred Galaxies.” ASTRONOMY & ASTROPHYSICS 637. https://doi.org/10.1051/0004-6361/201936176.
Chicago author-date (all authors)
Nersesian, Angelos, Sam Verstocken, Sébastien Viaene, Maarten Baes, EM Xilouris, S Bianchi, V Casasola, CJR Clark, JI Davies, Ilse De Looze, P De Vis, W Dobbels, J Fritz, M Galametz, F Galliano, AP Jones, S Madden, AV Mosenkov, Ana Trčka, and N Ysard. 2020. “High-Resolution, 3D Radiative Transfer Modelling, III : The DustPedia Barred Galaxies.” ASTRONOMY & ASTROPHYSICS 637. doi:10.1051/0004-6361/201936176.
Vancouver
1.
Nersesian A, Verstocken S, Viaene S, Baes M, Xilouris E, Bianchi S, et al. High-resolution, 3D radiative transfer modelling, III : the DustPedia barred galaxies. ASTRONOMY & ASTROPHYSICS. 2020;637.
IEEE
[1]
A. Nersesian et al., “High-resolution, 3D radiative transfer modelling, III : the DustPedia barred galaxies,” ASTRONOMY & ASTROPHYSICS, vol. 637, 2020.
@article{8645276,
  abstract     = {{Context: Dust in late-type galaxies in the local Universe is responsible for absorbing approximately one third of the energy emitted by stars. It is often assumed that dust heating is mainly attributable to the absorption of ultraviolet and optical photons emitted by the youngest (≤ 100 Myr) stars. Consequently, thermal re-emission by dust at far-infrared wavelengths is often linked to the star- formation activity of a galaxy. However, several studies argue that the contribution to dust heating by much older stellar populations might be more significant than previously thought. Advances in radiation transfer simulations finally allow us to actually quantify the heating mechanisms of diffuse dust by the stellar radiation field.
Aims: As one of the main goals in the DustPedia project, we have developed a framework to construct detailed 3D stellar and dust radiative transfer models for nearby galaxies. In this study, we analyse the contribution of the different stellar populations to the dust heating in four nearby face-on barred galaxies: NGC 1365, M 83, M 95, and M 100. We aim to quantify the fraction directly related to young stellar populations, both globally and on local scales, and to assess the influence of the bar on the heating fraction. Methods. From 2D images we derive the 3D distributions of stars and dust. To model the complex geometries, we used SKIRT, a state-of-the-art 3D Monte Carlo radiative transfer code designed to self-consistently simulate the absorption, scattering, and thermal re-emission by the dust for arbitrary 3D distributions.
Results: We derive global attenuation laws for each galaxy and confirm that galaxies of high specific star-formation rate have shallower attenuation curves and weaker UV bumps. On average, 36.5% of the bolometric luminosity is absorbed by dust in our galaxy sample. We report a clear effect of the bar structure on the radial profiles of the dust-heating fraction by the young stellar populations, and the dust temperature. We find that the young stellar populations are the main contributors to the dust heating, donating, on average ∼ 59% of their luminosity to this purpose throughout the galaxy. This dust-heating fraction drops to ∼ 53% in the bar region and ∼ 38% in the bulge region where the old stars are the dominant contributors to the dust heating. We also find a strong link between the heating fraction by the young stellar populations and the specific star-formation rate.}},
  articleno    = {{A25}},
  author       = {{Nersesian, Angelos and Verstocken, Sam and Viaene, Sébastien and Baes, Maarten and Xilouris, EM and Bianchi, S and Casasola, V and Clark, CJR and Davies, JI and De Looze, Ilse and De Vis, P and Dobbels, W and Fritz, J and Galametz, M and Galliano, F and Jones, AP and Madden, S and Mosenkov, AV and Trčka, Ana and Ysard, N}},
  issn         = {{1432-0746}},
  journal      = {{ASTRONOMY & ASTROPHYSICS}},
  keywords     = {{SPECTRAL ENERGY-DISTRIBUTION,EDGE-ON GALAXIES,STAR-FORMATION,SPIRAL GALAXIES,NEARBY GALAXIES,MULTIPLE-SCATTERING,INFRARED-EMISSION,INTERSTELLAR DUST,CENTRAL REGION,CLUMPY MEDIA,radiative transfer,dust,extinction,galaxies: ISM,infrared: ISM}},
  language     = {{eng}},
  pages        = {{23}},
  title        = {{High-resolution, 3D radiative transfer modelling, III : the DustPedia barred galaxies}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/201936176}},
  volume       = {{637}},
  year         = {{2020}},
}

Altmetric
View in Altmetric
Web of Science
Times cited: