文章基本信息

标题：Chemical evolution of elliptical galaxies with a variable IMF
其他标题：A publicly available code⋆
本地全文：下载
作者：Zhiqiang Yan ; Tereza Jerabkova ; Pavel Kroupa 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：629
页码：1-16
DOI：10.1051/0004-6361/201936029
语种：English
出版社：EDP Sciences
摘要：Growing evidence in recent years suggests a systematic variation of the stellar initial mass function (IMF), being top-heavy for starburst galaxies and possibly bottom-heavy for massive ellipticals. Galaxy chemical evolution simulations adopting an invariant canonical IMF face difficulty in simultaneously reproducing the metallicity andα-enhancement of the massive elliptical galaxies. Applying a variable IMF that changes with time is a promising solution, however, it is non-trivial to couple a variable IMF theory with the existing galaxy evolution codes. Here we present the first open source simulation code which recalculates the galaxy-wide IMF at each time step according to the integrated galactic IMF (IGIMF) theory where the galaxy-wide IMF depends on the galactic star formation rate and metallicity. The resulting galaxy-wide IMF and metal abundance evolve with time. With this pilot work, we explore the effect of the IGIMF theory on galaxy chemical evolution in comparison with an invariant IMF.
关键词：engalaxies: stellar contentgalaxies: ISMgalaxies: abundancesgalaxies: evolutionmethods: numericalgalaxies: starburst