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

アクセス数:33件（2026-02-16 00:52 集計）

固定URL: https://hdl.handle.net/11094/102940

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論文情報

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タイトル
Bridging theory and observations: insights into star formation efficiency and dust attenuation in z > 5 Galaxies
著者
NRID
1000030907374 1000030907374
researchmap permalink
dtoyouchi dtoyouchi
Scopus Author ID
56193314500 56193314500
著者名
Toyouchi, Daisuke
NRID
1000010756357 1000010756357
著者名
Yajima, Hidenobu
著者名
Ferrara, Andrea
NRID
1000050714086 1000050714086
ORCID
0000-0001-7457-8487 0000-0001-7457-8487
researchmap permalink
nagamine nagamine
Scopus Author ID
35243176000 35243176000
著者名
Nagamine, Kentaro
キーワード等
evolution – galaxies
galaxies
high-redshift – galaxies
luminosity function
mass function – galaxies
star formation
内容
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.
抄録
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.
出版者
Oxford University Press
収録物名
Monthly Notices of the Royal Astronomical Society
巻(号)
541(4)
ページ
3606-3626
刊行年月
2025-07-23
言語
英語
ハンドルURL
https://hdl.handle.net/11094/102940
PISSN
00358711
eISSN
13652966
関連情報 (isIdenticalTo)
DOI (出版社版)
https://doi.org/10.1093/mnras/staf1182
アクセス権
open access
権利情報
This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ
Version of Record
カテゴリ
学術雑誌論文 Journal Article