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High-redshift JWST predictions from IllustrisTNG: II. Galaxy line and continuum spectral indices and dust attenuation curves

Shen, Xuejian and Vogelsberger, Mark and Nelson, Dylan and Pillepich, Annalisa and Tacchella, Sandro and Marinacci, Federico and Torrey, Paul and Hernquist, Lars and Springel, Volker (2020) High-redshift JWST predictions from IllustrisTNG: II. Galaxy line and continuum spectral indices and dust attenuation curves. Monthly Notices of the Royal Astronomical Society, 495 (4). pp. 4747-4768. ISSN 0035-8711.

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We present predictions for high redshift (z = 2−10) galaxy populations based on the IllustrisTNG simulation suite and a full Monte Carlo dust radiative transfer post-processing. Specifically, we discuss the H α and H β + [OIII] luminosity functions up to z = 8. The predicted H β + [OIII] luminosity functions are consistent with present observations at z ≲ 3 with ≲0.1dex differences in luminosities. However, the predicted H α luminosity function is ∼0.3dex dimmer than the observed one at z ≃ 2. Furthermore, we explore continuum spectral indices, the Balmer break at 4000 Å; (D4000) and the UV continuum slope β. The median D4000 versus specific star formation rate relation predicted at z = 2 is in agreement with the local calibration despite a different distribution pattern of galaxies in this plane. In addition, we reproduce the observed AUV versus β relation and explore its dependence on galaxy stellar mass, providing an explanation for the observed complexity of this relation. We also find a deficiency in heavily attenuated, UV red galaxies in the simulations. Finally, we provide predictions for the dust attenuation curves of galaxies at z = 2−6 and investigate their dependence on galaxy colours and stellar masses. The attenuation curves are steeper in galaxies at higher redshifts, with bluer colours, or with lower stellar masses. We attribute these predicted trends to dust geometry. Overall, our results are consistent with present observations of high-redshift galaxies. Future James Webb Space Telecope observations will further test these predictions.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Shen, Xuejian0000-0002-6196-823X
Vogelsberger, Mark0000-0001-8593-7692
Nelson, Dylan0000-0001-8421-5890
Pillepich, Annalisa0000-0003-1065-9274
Tacchella, Sandro0000-0002-8224-4505
Marinacci, Federico0000-0003-3816-7028
Torrey, Paul0000-0002-5653-0786
Hernquist, Lars0000-0001-6950-1629
Springel, Volker0000-0001-5976-4599
Additional Information:© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 May 19. Received 2020 May 19; in original form 2020 February 24. Published: 22 May 2020. FM acknowledges support through the Program ‘Rita Levi Montalcini’ of the Italian Ministry of Education, University and Research (MIUR). The primary TNG simulations were realized with compute time granted by the Gauss Centre for Supercomputing (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 Centre Stuttgart. MV acknowledges support through an Massachusetts Institute of Technology (MIT) RSC award, a Kavli Research Investment Fund, National Aeronautics and Space Administration (NASA) Astrophysics Theory Program (ATP) grant NNX17AG29G, and National Science Foundation (NSF) grants AST-1814053, AST-1814259, and AST-1909831.
Funding AgencyGrant Number
Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR)UNSPECIFIED
Massachusetts Institute of Technology (MIT)UNSPECIFIED
Subject Keywords:methods: numerical, galaxies: high redshift, galaxies: evolution, galaxies: formation, ultraviolet: galaxies
Issue or Number:4
Record Number:CaltechAUTHORS:20200624-093540415
Persistent URL:
Official Citation:Xuejian Shen, Mark Vogelsberger, Dylan Nelson, Annalisa Pillepich, Sandro Tacchella, Federico Marinacci, Paul Torrey, Lars Hernquist, Volker Springel, High-redshift JWST predictions from IllustrisTNG: II. Galaxy line and continuum spectral indices and dust attenuation curves, Monthly Notices of the Royal Astronomical Society, Volume 495, Issue 4, July 2020, Pages 4747–4768,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103988
Deposited By: Tony Diaz
Deposited On:24 Jun 2020 17:40
Last Modified:09 Apr 2021 18:07

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