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|a Popping, Gergö
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|a Pillepich, Annalisa
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|a Calistro Rivera, Gabriela
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|a Schulz, Sebastian
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|a Hernquist, Lars
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|a Kaasinen, Melanie
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|a Marinacci, Federico
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|a Nelson, Dylan
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|a Vogelsberger, Mark
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|a The dust-continuum size of TNG50 galaxies at z = 1-5: a comparison with the distribution of stellar light, stars, dust, and H2
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|b Oxford University Press (OUP),
|c 2022-05-06T13:16:52Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/142381
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|a ABSTRACT 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 $\mu$m is up to ∼75 per cent larger than the stellar half-mass radius, but significantly more compact than the observed-frame 1.6 $\mu$m (roughly corresponding to H band) half-light radius, particularly towards high redshifts: the compactness compared to the 1.6 $\mu$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 $\mu$m disc sizes relative to that at 850 $\mu$m. The difference in relative extents increases with redshift because the observed-frame 1.6 $\mu$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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|a Article
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|t 10.1093/MNRAS/STAB3312
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|t Monthly Notices of the Royal Astronomical Society
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