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Massive Star Formation at Supersolar Metallicities:Constraints on the Initial Mass Function 认领 引用 被引量：1
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作者 Eda Gjergo Zhi-Yu Zhang +6 位作者 Pavel Kroupa Aleksei Sorokin Zhiqiang Yan Ziyi Guo Tereza Jerabkova Akram Hasani Zonoozi Hosein Haghi 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第2期196-217,共22页
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(... 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,α_1,and the metal mass fraction,Z.This linearα_1-Z relation has been calibrated up to≈2Z_☉,though higher metallicity environments are known to exist.We show that if the linearα_1-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 metallicityinsensitive fragmentation regimes.We provide a user-friendly public code,pyIGIMF,which enables the instantaneous computation of the IGIMF theory with both linear and logisticα_1-Z relations. 展开更多
关键词 galaxies star formation-stars luminosity function,mass function-galaxies luminosity function,mass function-methods numerical
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