The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2
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 radi...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Oxford University Press (OUP)
2022
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| Online Access: | https://hdl.handle.net/1721.1/142381 |
| _version_ | 1826196726271180800 |
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| author | Popping, Gergö Pillepich, Annalisa Calistro Rivera, Gabriela Schulz, Sebastian Hernquist, Lars Kaasinen, Melanie Marinacci, Federico Nelson, Dylan Vogelsberger, Mark |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Popping, Gergö Pillepich, Annalisa Calistro Rivera, Gabriela Schulz, Sebastian Hernquist, Lars Kaasinen, Melanie Marinacci, Federico Nelson, Dylan Vogelsberger, Mark |
| author_sort | Popping, Gergö |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:36:59Z |
| format | Article |
| id | mit-1721.1/142381 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:36:59Z |
| publishDate | 2022 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/1423812023-04-18T20:01:06Z The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2 Popping, Gergö Pillepich, Annalisa Calistro Rivera, Gabriela Schulz, Sebastian Hernquist, Lars Kaasinen, Melanie Marinacci, Federico Nelson, Dylan Vogelsberger, Mark MIT Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology. Department of Physics 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. 2022-05-06T13:16:52Z 2022-05-06T13:16:52Z 2022 2022-05-06T13:08:24Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142381 Popping, Gergö, Pillepich, Annalisa, Calistro Rivera, Gabriela, Schulz, Sebastian, Hernquist, Lars et al. 2022. "The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2." Monthly Notices of the Royal Astronomical Society, 510 (3). en 10.1093/MNRAS/STAB3312 Monthly Notices of the Royal Astronomical Society Attribution-NonCommercial-ShareAlike 4.0 International https://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press (OUP) arXiv |
| spellingShingle | Popping, Gergö Pillepich, Annalisa Calistro Rivera, Gabriela Schulz, Sebastian Hernquist, Lars Kaasinen, Melanie Marinacci, Federico Nelson, Dylan Vogelsberger, Mark The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2 |
| title | The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2 |
| title_full | The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2 |
| title_fullStr | The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2 |
| title_full_unstemmed | The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2 |
| title_short | The dust-continuum size of TNG50 galaxies at z = 1–5: a comparison with the distribution of stellar light, stars, dust, and H2 |
| title_sort | dust continuum size of tng50 galaxies at z 1 5 a comparison with the distribution of stellar light stars dust and h2 |
| url | https://hdl.handle.net/1721.1/142381 |
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