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HERschel Observations of Edge-on Spirals (HEROES), III : dust energy balance study of IC 2531

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Abstract
We investigate the dust energy balance for the edge-on galaxy IC 2531, one of the seven galaxies in the HEROES sample. We perform a state-of-the-art radiative transfer modelling based, for the first time, on a set of optical and near-infrared galaxy images. We show that by taking into account near-infrared imaging in the modelling significantly improves the constraints on the retrieved parameters of the dust content. We confirm the result from previous studies that including a young stellar population in the modelling is important to explain the observed stellar energy distribution. However, the discrepancy between the observed and modelled thermal emission at far-infrared wavelengths, the so-called dust energy balance problem, is still present: the model underestimates the observed fluxes by a factor of about two. We compare two different dust models, and find that dust parameters, and thus the spectral energy distribution in the infrared domain, are sensitive to the adopted dust model. In general, the THEMIS model reproduces the observed emission in the infrared wavelength domain better than the popular BARE-GR-S model. Our study of IC 2531 is a pilot case for detailed and uniform radiative transfer modelling of the entire HEROES sample, which will shed more light on the strength and origins of the dust energy balance problem.
Keywords
radiative transfer, dust, extinction, galaxies: ISM, infrared: ISM, RADIATIVE-TRANSFER CODE, ALL-SKY SURVEY, SURFACE-BRIGHTNESS PROFILES, DEPROJECTED SERSIC MODEL, SPITZER-SPACE-TELESCOPE, EARLY-TYPE GALAXIES, MATTER HALO SHAPE, INTERSTELLAR DUST, DISK GALAXIES, INFRARED-EMISSION

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Chicago
Mosenkov, Aleksandr, Flor Allaert, Maarten Baes, Simone Bianchi, Peter Camps, Gert De Geyter, Ilse De Looze, et al. 2016. “HERschel Observations of Edge-on Spirals (HEROES), III : Dust Energy Balance Study of IC 2531.” Astronomy & Astrophysics 592.
APA
Mosenkov, A., Allaert, F., Baes, M., Bianchi, S., Camps, P., De Geyter, G., De Looze, I., et al. (2016). HERschel Observations of Edge-on Spirals (HEROES), III : dust energy balance study of IC 2531. ASTRONOMY & ASTROPHYSICS, 592.
Vancouver
1.
Mosenkov A, Allaert F, Baes M, Bianchi S, Camps P, De Geyter G, et al. HERschel Observations of Edge-on Spirals (HEROES), III : dust energy balance study of IC 2531. ASTRONOMY & ASTROPHYSICS. 2016;592.
MLA
Mosenkov, Aleksandr, Flor Allaert, Maarten Baes, et al. “HERschel Observations of Edge-on Spirals (HEROES), III : Dust Energy Balance Study of IC 2531.” ASTRONOMY & ASTROPHYSICS 592 (2016): n. pag. Print.
@article{8503167,
  abstract     = {We investigate the dust energy balance for the edge-on galaxy IC 2531, one of the seven galaxies in the HEROES sample. We perform a state-of-the-art radiative transfer modelling based, for the first time, on a set of optical and near-infrared galaxy images. We show that by taking into account near-infrared imaging in the modelling significantly improves the constraints on the retrieved parameters of the dust content. We confirm the result from previous studies that including a young stellar population in the modelling is important to explain the observed stellar energy distribution. However, the discrepancy between the observed and modelled thermal emission at far-infrared wavelengths, the so-called dust energy balance problem, is still present: the model underestimates the observed fluxes by a factor of about two. We compare two different dust models, and find that dust parameters, and thus the spectral energy distribution in the infrared domain, are sensitive to the adopted dust model. In general, the THEMIS model reproduces the observed emission in the infrared wavelength domain better than the popular BARE-GR-S model. Our study of IC 2531 is a pilot case for detailed and uniform radiative transfer modelling of the entire HEROES sample, which will shed more light on the strength and origins of the dust energy balance problem.},
  articleno    = {A71},
  author       = {Mosenkov, Aleksandr and Allaert, Flor and Baes, Maarten and Bianchi, Simone and Camps, Peter and De Geyter, Gert and De Looze, Ilse and Fritz, Jacopo and Gentile, Gianfranco and Hughes, Thomas M and Lewis, Fraser and Verstappen, Joris and Verstocken, Sam and Viaene, S{\'e}bastien},
  issn         = {1432-0746},
  journal      = {ASTRONOMY \& ASTROPHYSICS},
  keyword      = {radiative transfer,dust,extinction,galaxies: ISM,infrared: ISM,RADIATIVE-TRANSFER CODE,ALL-SKY SURVEY,SURFACE-BRIGHTNESS PROFILES,DEPROJECTED SERSIC MODEL,SPITZER-SPACE-TELESCOPE,EARLY-TYPE GALAXIES,MATTER HALO SHAPE,INTERSTELLAR DUST,DISK GALAXIES,INFRARED-EMISSION},
  language     = {eng},
  pages        = {15},
  title        = {HERschel Observations of Edge-on Spirals (HEROES), III : dust energy balance study of IC 2531},
  url          = {http://dx.doi.org/10.1051/0004-6361/201628676},
  volume       = {592},
  year         = {2016},
}

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