The dust-continuum size of TNG50 galaxies at z = 1-5: a comparison with the distribution of stellar light, stars, dust, and H2

We present predictions for the extent of the dust-continuum emission of main-sequence galaxies drawn from the TNG50 simulation in the range z = 1-5. We couple the radiative transfer code SKIRT to the output of the TNG50 simulation and measure the dust-continuum half-light radius of the modelled gala...

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Hauptverfasser: Popping, Gergö (VerfasserIn) , Pillepich, Annalisa (VerfasserIn) , Calistro Rivera, Gabriela (VerfasserIn) , Schulz, Sebastian (VerfasserIn) , Hernquist, Lars (VerfasserIn) , Kaasinen, Melanie (VerfasserIn) , Marinacci, Federico (VerfasserIn) , Nelson, Dylan (VerfasserIn) , Vogelsberger, Mark (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2022
In: Monthly notices of the Royal Astronomical Society
Year: 2022, Jahrgang: 510, Heft: 3, Pages: 3321-3334
ISSN:1365-2966
DOI:10.1093/mnras/stab3312
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stab3312
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Verfasserangaben:Gergö Popping, Annalisa Pillepich, Gabriela Calistro Rivera, Sebastian Schulz, Lars Hernquist, Melanie Kaasinen, Federico Marinacci, Dylan Nelson and Mark Vogelsberger

MARC

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245 1 4 |a The dust-continuum size of TNG50 galaxies at z = 1-5  |b a comparison with the distribution of stellar light, stars, dust, and H2  |c Gergö Popping, Annalisa Pillepich, Gabriela Calistro Rivera, Sebastian Schulz, Lars Hernquist, Melanie Kaasinen, Federico Marinacci, Dylan Nelson and Mark Vogelsberger 
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520 |a We present predictions for the extent of the dust-continuum emission of main-sequence galaxies drawn from the TNG50 simulation in the range z = 1-5. We couple the radiative transfer code SKIRT to the output of the TNG50 simulation and measure the dust-continuum half-light radius of the modelled galaxies, assuming a Milky Way dust type and a metallicity-dependent dust-to-metal ratio. The dust-continuum half-light radius at observed-frame 850 $\m  |m is up to ∼75 per cent larger than the stellar half-mass radius, but significantly more compact than the observed-frame 1.6 $\m  |m (roughly corresponding to H band) half-light radius, particularly towards high redshifts: the compactness compared to the 1.6 $\m  |m emission increases with redshift. This is driven by obscuration of stellar light from the galaxy centres, which increases the apparent extent of 1.6 $\m  |m disc sizes relative to that at 850 $\mu$m. The difference in relative extents increases with redshift because the observed-frame 1.6 $\m  |m emission stems from ever shorter wavelength stellar emission. These results suggest that the compact dust-continuum emission observed in z > 1 galaxies is not (necessarily) evidence of the build-up of a dense central stellar component. We find that the dust-continuum half-light radius closely follows the radius containing half the star formation and half the dust mass in galaxies and is ∼80 per cent of the radius containing half the H2 mass. The presented results are a common feature of main-sequence galaxies. 
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