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High redshift JWST predictions from IllustrisTNG: III. Infrared luminosity functions, obscured star formation and dust temperature of high-redshift galaxies

Shen, Xuejian and Vogelsberger, Mark and Nelson, Dylan and Tacchella, Sandro and Hernquist, Lars and Springel, Volker and Marinacci, Federico and Torrey, Paul (2021) High redshift JWST predictions from IllustrisTNG: III. Infrared luminosity functions, obscured star formation and dust temperature of high-redshift galaxies. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20210825-184635260

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Abstract

We post-process galaxies in the IllustrisTNG simulations with SKIRT radiative transfer calculations to make predictions for the rest-frame near-infrared (NIR) and far-infrared (FIR) properties of galaxies at z ≥ 4. The rest-frame K- and z-band galaxy luminosity functions from TNG are overall consistent with observations, despite a ∼0.4 dex underprediction at z = 4 for M_z ≲ −24. Predictions for the JWST MIRI observed galaxy luminosity functions and number counts are given. We show that the next-generation survey conducted by JWST can detect 500 (30) galaxies in F1000W in a survey area of 500 arcmin² at z = 6 (z = 8). As opposed to the consistency in the UV, optical and NIR, we find that TNG, combined with our dust modelling choices, significantly underpredicts the abundance of most dust-obscured and thus most luminous FIR galaxies. As a result, the obscured cosmic star formation rate density (SFRD) and the SFRD contributed by optical/NIR dark objects are underpredicted. The discrepancies discovered here could provide new constraints on the sub-grid feedback models, or the dust contents, of simulations. Meanwhile, although the TNG predicted dust temperature and its relations with IR luminosity and redshift are qualitatively consistent with observations, the peak dust temperature of z ≥ 6 galaxies are overestimated by about 20K. This could be related to the limited mass resolution of our simulations to fully resolve the porosity of the interstellar medium (or specifically its dust content) at these redshifts.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2104.12788arXivDiscussion Paper
https://www.tng-project.org/data/Related ItemData
ORCID:
AuthorORCID
Shen, Xuejian0000-0002-6196-823X
Vogelsberger, Mark0000-0001-8593-7692
Nelson, Dylan0000-0001-8421-5890
Tacchella, Sandro0000-0002-8224-4505
Hernquist, Lars0000-0001-6950-1629
Springel, Volker0000-0001-5976-4599
Marinacci, Federico0000-0003-3816-7028
Torrey, Paul0000-0002-5653-0786
Additional Information:MV acknowledges support through NASA ATP grants 16-ATP16-0167, 19-ATP19-0019, 19-ATP19-0020, 19-ATP19-0167, and NSF grants AST-1814053, AST-1814259, AST-1909831 and AST-2007355. ST is supported by the Smithsonian Astrophysical Observatory through the CfA Fellowship. PT acknowledges support from NSF grant AST-2008490. FM acknowledges support through the Program “Rita Levi Montalcini” of the Italian MUR. The primary TNG simulations were realized with compute time granted by the Gauss Centre for Super-computing (GCS): TNG50 under GCS Large-Scale Project GCS-DWAR (2016; PIs Nelson/Pillepich), and TNG100 and TNG300 under GCS-ILLU (2014; PI Springel) on the GCS share of the supercomputer Hazel Hen at the High Performance Computing Center Stuttgart (HLRS). DATA AVAILABILITY. The simulation data of the IllustrisTNG project is publicly available at https://www.tng-project.org/data/. The analysis data of this work was generated and stored on the super-computing system Cannon at Harvard University. The data underlying this article can be shared on reasonable request to the corresponding author.
Group:TAPIR
Funders:
Funding AgencyGrant Number
NASA16-ATP16-0167
NASA19-ATP19-0019
NASA19-ATP19-0020
NASA19-ATP19-0167
NSFAST-1814053
NSFAST-1814259
NSFAST-1909831
NSFAST-2007355
Smithsonian Astrophysical ObservatoryUNSPECIFIED
NSFAST-2008490
Ministero dell'Università e della Ricerca (MUR)UNSPECIFIED
Subject Keywords:methods: numerical – galaxies: evolution - - galaxies: formation – galaxies: high redshift – infrared: galaxies
Record Number:CaltechAUTHORS:20210825-184635260
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210825-184635260
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110560
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:30 Aug 2021 20:51
Last Modified:30 Aug 2021 20:51

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