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08 October 2024 |
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Article overview
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Public Release of A-SLOTH: Ancient Stars and Local Observables by Tracing Halos | | Tilman Hartwig
; Mattis Magg
; Li-Hsin Chen
; Yuta Tarumi
; Volker Bromm
; Simon C. O. Glover
; Alexander P. Ji
; Ralf S. Klessen
; Muhammad A. Latif
; Marta Volonteri
; Naoki Yoshida
; | | Date: |
1 Jun 2022 | | Abstract: | The semi-analytical model A-SLOTH (Ancient Stars and Local Observables by
Tracing Halos) is the first public code that connects the formation of the
first stars and galaxies to observables. After several successful projects with
this model, we publish the source code and describe the public version in this
paper. The model is based on dark matter merger trees that can either be
generated based on Extended Press-Schechter theory or that can be imported from
dark matter simulations. On top of these merger trees, A-SLOTH applies
analytical recipes for baryonic physics to model the formation of both
metal-free and metal-poor stars and the transition between them with
unprecedented precision and fidelity. A-SLOTH samples individual stars and
includes radiative, chemical, and mechanical feedback. It is calibrated based
on six observables, such as the optical depth to Thomson scattering, the
stellar mass of the Milky Way and its satellite galaxies, the number of
extremely-metal poor stars, and the cosmic star formation rate density at high
redshift. A-SLOTH has versatile applications with moderate computational
requirements. It can be used to constrain the properties of the first stars and
high-z galaxies based on local observables, predicts properties of the oldest
and most metal-poor stars in the Milky Way, can serve as a subgrid model for
larger cosmological simulations, and predicts next-generation observables of
the early Universe, such as supernova rates or gravitational wave events. | | Source: | arXiv, 2206.00223 | | Services: | Forum | Review | PDF | Favorites | |
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