A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies
© 2020 The Author(s). We study the relation between the UV slope, β, and the ratio between the infrared-and UV luminosities (IRX) of galaxies from TNG50, the latest installment of the IllustrisTNG galaxy formation simulations. We select 7280 star-forming main-sequence (SFMS) galaxies with stellar ma...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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Oxford University Press (OUP)
2022
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| Online Access: | https://hdl.handle.net/1721.1/142373 |
| _version_ | 1826206848275972096 |
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| author | Schulz, Sebastian Popping, Gergö Pillepich, Annalisa Nelson, Dylan Vogelsberger, Mark Marinacci, Federico Hernquist, Lars |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Schulz, Sebastian Popping, Gergö Pillepich, Annalisa Nelson, Dylan Vogelsberger, Mark Marinacci, Federico Hernquist, Lars |
| author_sort | Schulz, Sebastian |
| collection | MIT |
| description | © 2020 The Author(s). We study the relation between the UV slope, β, and the ratio between the infrared-and UV luminosities (IRX) of galaxies from TNG50, the latest installment of the IllustrisTNG galaxy formation simulations. We select 7280 star-forming main-sequence (SFMS) galaxies with stellar mass ≥109 M⊙ at redshifts 0 ≤ z ≤ 4 and perform radiative transfer with skirt to model effects of interstellar medium dust on the emitted stellar light. Assuming a Milky Way dust type and a dust-to-metal ratio of 0.3, we find that TNG50 SFMS galaxies generally agree with observationally derived IRX-β relations at z ≳ 1. However, we find a redshift-dependent systematic offset with respect to empirically derived local relations, with the TNG50 IRX-β relation shifting towards lower β and steepening at higher redshifts. This is partially driven by variations in the dust-uncorrected UV slope of galaxies, due to different star formation histories of galaxies selected at different cosmic epochs; we suggest the remainder of the effect is caused by differences in the effective dust attenuation curves of galaxies as a function of redshift. We find a typical galaxy-to-galaxy variation of 0.3 dex in infrared excess (IRX) at fixed β, correlated with intrinsic galaxy properties: galaxies with higher star formation rates, star formation efficiencies, gas metallicities and stellar masses exhibit larger IRX values. We demonstrate a degeneracy between stellar age, dust geometry, and dust composition: z = 4 galaxies with a Small Magellanic Cloud dust type follow the same IRX-β relation as low-redshift galaxies with MW dust. We provide a redshift-dependent fitting function for the IRX-β relation for MW dust based on our models. |
| first_indexed | 2024-09-23T13:39:13Z |
| format | Article |
| id | mit-1721.1/142373 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:39:13Z |
| publishDate | 2022 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/1423732023-08-07T18:39:03Z A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies Schulz, Sebastian Popping, Gergö Pillepich, Annalisa Nelson, Dylan Vogelsberger, Mark Marinacci, Federico Hernquist, Lars MIT Kavli Institute for Astrophysics and Space Research © 2020 The Author(s). We study the relation between the UV slope, β, and the ratio between the infrared-and UV luminosities (IRX) of galaxies from TNG50, the latest installment of the IllustrisTNG galaxy formation simulations. We select 7280 star-forming main-sequence (SFMS) galaxies with stellar mass ≥109 M⊙ at redshifts 0 ≤ z ≤ 4 and perform radiative transfer with skirt to model effects of interstellar medium dust on the emitted stellar light. Assuming a Milky Way dust type and a dust-to-metal ratio of 0.3, we find that TNG50 SFMS galaxies generally agree with observationally derived IRX-β relations at z ≳ 1. However, we find a redshift-dependent systematic offset with respect to empirically derived local relations, with the TNG50 IRX-β relation shifting towards lower β and steepening at higher redshifts. This is partially driven by variations in the dust-uncorrected UV slope of galaxies, due to different star formation histories of galaxies selected at different cosmic epochs; we suggest the remainder of the effect is caused by differences in the effective dust attenuation curves of galaxies as a function of redshift. We find a typical galaxy-to-galaxy variation of 0.3 dex in infrared excess (IRX) at fixed β, correlated with intrinsic galaxy properties: galaxies with higher star formation rates, star formation efficiencies, gas metallicities and stellar masses exhibit larger IRX values. We demonstrate a degeneracy between stellar age, dust geometry, and dust composition: z = 4 galaxies with a Small Magellanic Cloud dust type follow the same IRX-β relation as low-redshift galaxies with MW dust. We provide a redshift-dependent fitting function for the IRX-β relation for MW dust based on our models. 2022-05-05T18:55:09Z 2022-05-05T18:55:09Z 2020 2022-05-05T18:49:19Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142373 Schulz, Sebastian, Popping, Gergö, Pillepich, Annalisa, Nelson, Dylan, Vogelsberger, Mark et al. 2020. "A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies." Monthly Notices of the Royal Astronomical Society, 497 (4). en 10.1093/MNRAS/STAA1900 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by/4.0 application/pdf Oxford University Press (OUP) Oxford University Press |
| spellingShingle | Schulz, Sebastian Popping, Gergö Pillepich, Annalisa Nelson, Dylan Vogelsberger, Mark Marinacci, Federico Hernquist, Lars A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies |
| title | A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies |
| title_full | A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies |
| title_fullStr | A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies |
| title_full_unstemmed | A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies |
| title_short | A redshift-dependent IRX–β dust attenuation relation for TNG50 galaxies |
| title_sort | redshift dependent irx β dust attenuation relation for tng50 galaxies |
| url | https://hdl.handle.net/1721.1/142373 |
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