Bridging theory and observations: insights into star formation efficiency and dust attenuation in z > 5 Galaxies

Toyouchi, Daisuke; Yajima, Hidenobu; Ferrara, Andrea et al.

Monthly Notices of the Royal Astronomical Society, 2025, 541(4), 3606-3626

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Identifier to cite or link to this item: https://hdl.handle.net/11094/102940

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Title
Bridging theory and observations: insights into star formation efficiency and dust attenuation in z > 5 Galaxies
Creator
NRID
1000030907374 1000030907374
researchmap permalink
dtoyouchi dtoyouchi
Scopus Author ID
56193314500 56193314500
CreatorName
Toyouchi, Daisuke
NRID
1000010756357 1000010756357
CreatorName
Yajima, Hidenobu
CreatorName
Ferrara, Andrea
NRID
1000050714086 1000050714086
ORCID
0000-0001-7457-8487 0000-0001-7457-8487
researchmap permalink
nagamine nagamine
Scopus Author ID
35243176000 35243176000
CreatorName
Nagamine, Kentaro
Subject
evolution – galaxies
galaxies
high-redshift – galaxies
luminosity function
mass function – galaxies
star formation
Description
Toyouchi D., Yajima H., Ferrara A., et al. Bridging theory and observations: insights into star formation efficiency and dust attenuation in z > 5 Galaxies. Monthly Notices of the Royal Astronomical Society 541, 3606 (2025); https://doi.org/10.1093/mnras/staf1182.
Abstract
We investigate early galaxy evolution by modeling self-consistently their radially resolved evolution of gas, stars, heavy elements, and dust content. Our model successfully reproduces various observed properties of JWST-identified galaxies at z > 5, including sizes, stellar masses, star formation rates (SFR), metallicities, and dust-to-stellar mass ratios. We show that the star formation efficiency (SFE), f∗ ≡ SFR/(fbṀₕ), is regulated by the global equilibrium between cosmological gas inflows, star formation, and gas outflows. Our model predicts f∗ ≾ 20 per cent for galaxies with halo masses of Mₕ ∼ 10¹¹⁻¹² M☉ down to z = 5, allowing them to reach intrinsic ultraviolet (UV) magnitudes of Mᵤᵥ ≾ −22 mag; when dust attenuation is ignored, the predicted UV luminosity function (LF) at z ∼ 12 agrees well with observations. However, our model also suggests that these galaxies would be heavily obscured by dust, with high optical depths at 1500 Å of τ₁₅₀₀ ≿ 10, causing the dust-attenuated UV LF to fall significantly below the observed one. This discrepancy highlights the need for mechanisms that mitigate strong dust attenuation, such as dust evacuation from star-forming regions and/or preferential production of large dust grains. Further exploration of these processes is essential for understanding the early stages of galaxy evolution.
Publisher
Oxford University Press
Source Title
Monthly Notices of the Royal Astronomical Society
Volume (Issue)
541(4)
Page
3606-3626
Date of Issued
2025-07-23
Language
English
Handle URL
https://hdl.handle.net/11094/102940
PISSN
00358711
eISSN
13652966
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1093/mnras/staf1182
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article