Massive Star Formation at Supersolar Metallicities: Constraints
on the Initial Mass Function

J 2026

Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function

GJERGO, Eda; Zhi-Yu ZHANG; Pavel KROUPA; Aleksei SOROKIN; Zhiqiang YAN et al.

Základní údaje

Originální název

Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function

Autoři

GJERGO, Eda; Zhi-Yu ZHANG; Pavel KROUPA; Aleksei SOROKIN; Zhiqiang YAN; Ziyi GUO; Tereza JEŘÁBKOVÁ; Akram Hasani ZONOOZI a Hosein HAGHI

Vydání

RESEARCH IN ASTRONOMY AND ASTROPHYSICS, Bristol, IOP Publishing Ltd, 2026, 1674-4527

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.800 v roce 2024

Označené pro přenos do RIV

Ano

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

galaxies: star formation; methods: numerical; stars: luminosity function; stars: mass function; galaxies: luminosity function; galaxies: mass function

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 30. 4. 2026 14:34, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Research in Astronomy and Astrophysics Research Paper Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function Eda Gjergo, Zhi-Yu Zhang, Pavel Kroupa, Aleksei Sorokin, Zhiqiang Yan, Ziyi Guo, Tereza Jerabkova, Akram Hasani Zonoozi and Hosein Haghi Published 17 December 2025 • © 2025. National Astronomical Observatories, CAS and IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved. Research in Astronomy and Astrophysics, Volume 26, Number 2 Citation Eda Gjergo et al 2026 Res. Astron. Astrophys. 26 025003 DOI 10.1088/1674-4527/ae1f79 CSTR32081.14.RAA.ae1f79 DownloadArticle PDF Authors Figures Tables References Article metrics 54 Total downloads 11 citation on Dimensions. Permissions Get permission to re-use this article Share this article Article information Abstract Metals enhance the cooling efficiency of molecular clouds, promoting fragmentation. Consequently, increasing the metallicity may boost the formation of low-mass stars. Within the integrated galactic initial mass function (IGIMF) theory, this effect is empirically captured by a linear relation between the slope of the low-mass stellar IMF, α1, and the metal mass fraction, Z. This linear α1–Z relation has been calibrated up to ≈2 Z⊙, though higher metallicity environments are known to exist. We show that if the linear α1–Z relation extends to higher metallicities ([Z] ≳ 0.5), massive star formation is suppressed entirely. Alternatively, fragmentation efficiency may saturate beyond some metallicity threshold if gravitational collapse cascades rapidly enough. To model this behavior, we propose a logistic function describing the transition from metallicity-sensitive to metallicity-insensitive fragmentation regimes. We provide a user-friendly public code, pyIGIMF, which enables the instantaneous computation of the IGIMF theory with both linear and logistic α1–Z relations.

Citovat

GJERGO, Eda; Zhi-Yu ZHANG; Pavel KROUPA; Aleksei SOROKIN; Zhiqiang YAN; Ziyi GUO; Tereza JEŘÁBKOVÁ; Akram Hasani ZONOOZI a Hosein HAGHI. Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function. RESEARCH IN ASTRONOMY AND ASTROPHYSICS. Bristol: IOP Publishing Ltd, 2026, roč. 26, č. 2, s. 1-22. ISSN 1674-4527. Dostupné z: https://doi.org/10.1088/1674-4527/ae1f79.

@article{2548386,
   author = {Gjergo, Eda and Zhang, ZhiandYu and Kroupa, Pavel and Sorokin, Aleksei and Yan, Zhiqiang and Guo, Ziyi and Jeřábková, Tereza and Zonoozi, Akram Hasani and Haghi, Hosein},
   article_location = {Bristol},
   article_number = {2},
   doi = {https://doi.org/10.1088/1674-4527/ae1f79},
   keywords = {galaxies: star formation; methods: numerical; stars: luminosity function; stars: mass function; galaxies: luminosity function; galaxies: mass function},
   language = {eng},
   issn = {1674-4527},
   journal = {RESEARCH IN ASTRONOMY AND ASTROPHYSICS},
   title = {Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function},
   url = {https://iopscience.iop.org/article/10.1088/1674-4527/ae1f79},
   volume = {26},
   year = {2026}
}

TY  - JOUR
ID  - 2548386
AU  - Gjergo, Eda - Zhang, Zhi-Yu - Kroupa, Pavel - Sorokin, Aleksei - Yan, Zhiqiang - Guo, Ziyi - Jeřábková, Tereza - Zonoozi, Akram Hasani - Haghi, Hosein
PY  - 2026
TI  - Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function
JF  - RESEARCH IN ASTRONOMY AND ASTROPHYSICS
VL  - 26
IS  - 2
SP  - 1-22
EP  - 1-22
PB  - IOP Publishing Ltd
SN  - 16744527
KW  - galaxies: star formation
KW  - methods: numerical
KW  - stars: luminosity function
KW  - stars: mass function
KW  - galaxies: luminosity function
KW  - galaxies: mass function
UR  - https://iopscience.iop.org/article/10.1088/1674-4527/ae1f79
N2  - Research in Astronomy and Astrophysics Research Paper Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function Eda Gjergo, Zhi-Yu Zhang, Pavel Kroupa, Aleksei Sorokin, Zhiqiang Yan, Ziyi Guo, Tereza Jerabkova, Akram Hasani Zonoozi and Hosein Haghi Published 17 December 2025 • © 2025. National Astronomical Observatories, CAS and IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved. Research in Astronomy and Astrophysics, Volume 26, Number 2 Citation Eda Gjergo et al 2026 Res. Astron. Astrophys. 26 025003 DOI 10.1088/1674-4527/ae1f79 CSTR32081.14.RAA.ae1f79 DownloadArticle PDF Authors Figures Tables References Article metrics 54 Total downloads 11 citation on Dimensions. Permissions Get permission to re-use this article Share this article Article information Abstract Metals enhance the cooling efficiency of molecular clouds, promoting fragmentation. Consequently, increasing the metallicity may boost the formation of low-mass stars. Within the integrated galactic initial mass function (IGIMF) theory, this effect is empirically captured by a linear relation between the slope of the low-mass stellar IMF, α1, and the metal mass fraction, Z. This linear α1–Z relation has been calibrated up to ≈2 Z⊙, though higher metallicity environments are known to exist. We show that if the linear α1–Z relation extends to higher metallicities ([Z] ≳ 0.5), massive star formation is suppressed entirely. Alternatively, fragmentation efficiency may saturate beyond some metallicity threshold if gravitational collapse cascades rapidly enough. To model this behavior, we propose a logistic function describing the transition from metallicity-sensitive to metallicity-insensitive fragmentation regimes. We provide a user-friendly public code, pyIGIMF, which enables the instantaneous computation of the IGIMF theory with both linear and logistic α1–Z relations.
ER  -

GJERGO, Eda; Zhi-Yu ZHANG; Pavel KROUPA; Aleksei SOROKIN; Zhiqiang YAN; Ziyi GUO; Tereza JEŘÁBKOVÁ; Akram Hasani ZONOOZI a Hosein HAGHI. Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function. \textit{RESEARCH IN ASTRONOMY AND ASTROPHYSICS}. Bristol: IOP Publishing Ltd, 2026, roč.~26, č.~2, s.~1-22. ISSN~1674-4527. Dostupné z: https://doi.org/10.1088/1674-4527/ae1f79.

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