Massive Star Clusters in the Semi-Analytical Galaxy Formation Model L-Galaxies 2020

2025/04/16 by Hoyer, Nils, Bonoli, Silvia, Bastian, Nate +7
#Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2504.12079

Abstract

It is established that there exists a direct link between the formation history of star cluster populations and their host galaxies, however, our lacking understanding of star cluster assembly prohibits us to make full use of their ability to trace galaxy evolution. In this work we introduce a new variation of the 2020 version of the semi-analytical galaxy formation model "L-Galaxies" that includes the formation of star clusters above 10⁴ M_Sun and probes different physical assumptions that affect their evolution over cosmic time. We use properties of different galaxy components and localised star formation to determine the bound fraction of star formation in disks. After randomly sampling masses from an environmentally-dependent star cluster initial mass function, we assign to each object a half-mass radius, metallicity, and distance from the galaxy centre. We consider up to 2000 individual star clusters per galaxy and evolve their properties over time taking into account stellar evolution, two-body relaxation, tidal shocks, dynamical friction, and a re-positioning during galaxy mergers. Our simulation successfully reproduces several observational quantities, such as the empirical relationship between the absolute V -band magnitude of the brightest young star clusters and the host galaxy star formation rate, the mass function of young star clusters, or mean metallicities of the star cluster distributions versus galaxy masses. The simulation reveals great complexity in the z = 0 star cluster population resulting from differential destruction channels and origins, including in-situ populations in the disk, a major merger-induced heated component in the halo, and accreted star clusters. Model variations point out the importance of e.g. the shape of the star cluster initial mass function or the relationship between the sound speed of cold gas and the star formation rate.

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