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Spatially resolved star formation and inside-out quenching in the TNG50 simulation and 3D-HST observations

We compare the star-forming main sequence (SFMS) of galaxies - both integrated and resolved on 1 kpc scales - between the high-resolution TNG50 simulation of IllustrisTNG and observations from the 3D-HST slitless spectroscopic survey at z ∼ 1. Contrasting integrated star formation rates (SFRs), we f...

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Main Authors: Nelson, Erica J. (Author) , Tacchella, Sandro (Author) , Diemer, Benedikt (Author) , Leja, Joel (Author) , Hernquist, Lars (Author) , Whitaker, Katherine E (Author) , Weinberger, Rainer (Author) , Pillepich, Annalisa (Author) , Nelson, Dylan (Author) , Terrazas, Bryan A. (Author) , Nevin, Rebecca (Author) , Brammer, Gabriel B. (Author) , Burkhart, Blakesley (Author) , Cochrane, Rachel K. (Author) , van Dokkum, Pieter (Author) , Johnson, Benjamin D. (Author) , Marinacci, Federico (Author) , Mowla, Lamiya (Author) , Pakmor, Rüdiger (Author) , Skelton, Rosalind Eugenie (Author) , Speagle, Joshua (Author) , Springel, Volker (Author) , Torrey, Paul (Author) , Vogelsberger, Mark (Author) , Wuyts, Stijn (Author)
Format: Article (Journal)
Language:English
Published: 09 August 2021
In: Monthly notices of the Royal Astronomical Society
Year: 2021, Volume: 508, Issue: 1, Pages: 219-235
ISSN:1365-2966
DOI:10.1093/mnras/stab2131
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stab2131
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Author Notes:Erica J. Nelson, Sandro Tacchella, Benedikt Diemer, Joel Leja, Lars Hernquist, Katherine E. Whitaker, Rainer Weinberger, Annalisa Pillepich, Dylan Nelson, Bryan A. Terrazas, Rebecca Nevin, Gabriel B. Brammer, Blakesley Burkhart, Rachel K. Cochrane, Pieter van Dokkum, Benjamin D. Johnson, Federico Marinacci, Lamiya Mowla, Rüdiger Pakmor, Rosalind E. Skelton, Joshua Speagle, Volker Springel, Paul Torrey, Mark Vogelsberger and Stijn Wuyts
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Summary:We compare the star-forming main sequence (SFMS) of galaxies - both integrated and resolved on 1 kpc scales - between the high-resolution TNG50 simulation of IllustrisTNG and observations from the 3D-HST slitless spectroscopic survey at z ∼ 1. Contrasting integrated star formation rates (SFRs), we find that the slope and normalization of the star-forming main sequence in TNG50 are quantitatively consistent with values derived by fitting observations from 3D-HST with the Prospector Bayesian inference framework. The previous offsets of 0.2-1 dex between observed and simulated main-sequence normalizations are resolved when using the updated masses and SFRs from Prospector. The scatter is generically smaller in TNG50 than in 3D-HST for more massive galaxies with M*> 1010 M⊙, by ∼10-40 per cent, after accounting for observational uncertainties. When comparing resolved star formation, we also find good agreement between TNG50 and 3D-HST: average specific star formation rate (sSFR) radial profiles of galaxies at all masses and radii below, on, and above the SFMS are similar in both normalization and shape. Most noteworthy, massive galaxies with M*> 1010.5 M⊙, which have fallen below the SFMS due to ongoing quenching, exhibit a clear central SFR suppression, in both TNG50 and 3D-HST. In contrast, the original Illustris simulation and a variant TNG run without black hole kinetic wind feedback, do not reproduce the central SFR profile suppression seen in data. In TNG, inside-out quenching is due to the supermassive black hole (SMBH) feedback model operating at low accretion rates.
Item Description:Gesehen am 09.12.2021
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stab2131

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