107 citations · 485 across the 27 of their papers we have counts for
27 papers
Individual Star Sampling in Star Formation Simulations: A Semi-Deterministic Model
Yunwei Deng, Hui Li, Zhiqiang Yan +2
In modern simulations that include star formation, it is common to use a universal and invariant initial mass function (IMF) to represent star populations or sample individual star…
Limited imprint of high-mass IMF variations on sodium abundances in main-sequence galaxies
Ziyi Guo, Donatella Romano, Zhiqiang Yan +10
Growing evidence suggests that the stellar initial mass function (IMF) varies systematically across galaxies, deviating from the canonical Milky Way form. Such variations would mod…
The mmax-Mecl relation in the LEGUS clusters
Marie Zinnkann, Tereza Jerabkova, Zhiqiang Yan +6
The relation between the maximum stellar mass in a very young cluster (mmax) and the total stellar mass of the cluster (Mecl), known as the mmax-Mecl relation, remains debated in t…
HR-GO II: chemical abundances of low- retrograde dynamically-tagged-groups: Revealing Thamnos as a very metal-poor substructure
Renjing Xie, Zhen Yuan, Haining Li +12
Milky Way halo substructures identified in dynamical space are known to suffer from contamination from the Milky Way in-situ stars, which makes their accreted origins uncertain. We…
Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function
Eda Gjergo, Zhiyu Zhang, Pavel Kroupa +6
Metals enhance the cooling efficiency of molecular clouds, promoting fragmentation. Consequently, increasing the metallicity may boost the formation of low-mass stars. Within the i…
Cosmic Threads: Interlinking the Stellar Initial Mass Function from Star-Birth to Galaxies
Tereza Jerabkova, Donatella Romano, Pavel Kroupa +19
The stellar initial mass function (sIMF) describes the distribution of stellar masses formed in a single star formation event in a molecular cloud clump. It is fundamental to astro…
Failed supernova explosions increase the duration of star formation in globular clusters
Henriette Wirth, Jaroslav Haas, Ladislav Šubr +3
Context. The duration of star formation (SF) in globular clusters (GCs) is an essential aspect for understanding their formation. Contrary to previous presumptions that all stars a…
The initial mass function of stars
Pavel Kroupa, Eda Gjergo, Tereza Jerabkova +1
The initial mass function (IMF) is one of the most important functions in astrophysics because it is key to reconstructing the cosmological matter cycle, understanding the formatio…
The Variation of the Galaxy-Wide IMF for Low-Mass Stars: Modeling and Observational Insights
Zhiqiang Yan, Jiadong Li, Pavel Kroupa +3
The Stellar Initial Mass Function (IMF) characterizes the mass distribution of newly formed stars in various cosmic environments, serving as a fundamental assumption in astrophysic…
First detection of CO isotopologues in a high-redshift main-sequence galaxy: evidence of a top-heavy stellar initial mass function
Ziyi Guo, Zhi-Yu Zhang, Zhiqiang Yan +5
Recent observations and theories have presented a strong challenge to the universality of the stellar initial mass function (IMF) in extreme environments. A notable example has bee…
The effect of the environment-dependent stellar initial mass function on the photometric properties of star-forming galaxies
Moritz Haslbauer, Zhiqiang Yan, Tereza Jerabkova +3
(Abridged) Observational estimates of galaxy properties rely on the inherent galaxy-wide initial mass function (gwIMF), which systematically varies with the global SFR and metallic…
The Present-Day Mass Function of Star Clusters in the Solar Neighborhood
Xiaoying Pang, Siqi Liao, Jiadong Li +5
This work analyses the present-day mass function (PDMF) of 93~star clusters utilizing Gaia DR3 data, with membership determined by the StarGo machine learning algorithm. The impact…
The Star Formation History in Local Group Galaxies. I. Ten Dwarf Galaxies
Yi Ren, Biwei Jiang, Yuxi Wang +2
The star formation histories (SFHs) of galaxies provide valuable insights into galaxy evolution and stellar physics. Understanding the SFHs enables the study of chemical enrichment…
Stellar Initial Mass Function Varies with Metallicities and Time
Jiadong Li, Chao Liu, Zhi-Yu Zhang +4
Most structural and evolutionary properties of galaxies strongly rely on the stellar initial mass function (IMF), namely the distribution of the stellar mass formed in each episode…
The most massive stars in very young star clusters with a limited mass: Evidence favours significant self-regulation in the star formation processes
Zhiqiang Yan, Tereza Jerabkova, Pavel Kroupa
The stellar initial mass function (IMF) is commonly interpreted to be a scale-invariant probability density distribution function (PDF) such that many small clusters yield the same…
Near-infrared chemical abundances of stars in the Sculptor dwarf galaxy
Baitian Tang, Jiajun Zhang, Zhiqiang Yan +3
Owing to the recent identification of major substructures in our Milky Way (MW), the astronomical community has started to reevaluate the importance of dissolved and existing dwarf…
The giants that were born swiftly -- Implications of the top-heavy stellar initial mass function on the birth conditions of globular clusters
Henriette Wirth, Pavel Kroupa, Jaroslav Haas +3
Recent results suggest that the initial mass function (IMF) of globular clusters (GCs) is metallicity and density dependent. Here it is studied how this variation affects the initi…
Chemical evolution of galaxies with an environment-dependent stellar initial mass function
Zhiqiang Yan
The presented study gives a comprehensive overview of the theory and the evidence for a systematically varying stellar initial mass function (IMF). Then we focus on the impact of t…
How many explosions does one need? -- Quantifying supernovae in globular clusters from iron abundance spreads
Henriette Wirth, Tereza Jerabkova, Zhiqiang Yan +3
Many globular clusters (GCs) are known to host multiple populations distinguishable by their light-element content. Less common are GCs displaying iron abundance spreads which are…
Downsizing revised: Star formation timescales for elliptical galaxies with an environment-dependent IMF and number of SNIa
Zhiqiang Yan, Tereza Jerabkova, Pavel Kroupa
Previous studies of the stellar mean metallicity and [Mg/Fe] values of massive elliptical (E)~galaxies suggest that their stars were formed in a very short timescale which cannot b…
Chemical evolution of ultra-faint dwarf galaxies in the self-consistently calculated IGIMF theory
Zhiqiang Yan, Tereza Jerabkova, Pavel Kroupa
The galaxy-wide stellar initial mass function (gwIMF) of a galaxy in dependence of its metallicity and star formation rate (SFR) can be calculated by the integrated galactic IMF (I…
The effect of the environment-dependent IMF on the formation and metallicities of stars over the cosmic history
Martyna Chruslinska, Tereza Jerabkova, Gijs Nelemans +1
Recent observational and theoretical studies indicate that the stellar initial mass function (IMF) varies systematically with the environment (star formation rate - SFR, metallicit…
The star formation timescale of elliptical galaxies -- Fitting [Mg/Fe] and total metallicity simultaneously
Zhiqiang Yan, Terea Jerabkova, Pavel Kroupa
The alpha element to iron peak element ratio, for example [Mg/Fe], is a commonly applied indicator of the galaxy star formation timescale (SFT) since the two groups of elements are…
Chemical evolution of elliptical galaxies with a variable IMF -- A publicly available code
Zhiqiang Yan, Tereza Jerabkova, Pavel Kroupa +1
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 ma…