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Formation and fate of low-metallicity stars in TNG50

Pakmor, Rüdiger, Simpson, Christine M., van de Voort, Freeke ORCID:, Hernquist, Lars, van Son, Lieke, Chruslinska, Martyna, Bieri, Rebekka, de Mink, Selma E. and Springel, Volker 2022. Formation and fate of low-metallicity stars in TNG50. Monthly Notices of the Royal Astronomical Society 512 (3) , pp. 3602-3615. 10.1093/mnras/stac717

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Low-metallicity stars give rise to unique spectacular transients and are of immense interest for understanding stellar evolution. Their importance has only grown further with the recent detections of mergers of stellar mass black holes that likely originate mainly from low-metallicity progenitor systems. Moreover, the formation of low-metallicity stars is intricately linked to galaxy evolution, in particular to early enrichment and to later accretion and mixing of lower metallicity gas. Because low-metallicity stars are difficult to observe directly, cosmological simulations are crucial for understanding their formation. Here, we quantify the rates and locations of low-metallicity star formation using the high-resolution TNG50 magnetohydrodynamical cosmological simulation, and we examine where low-metallicity stars end up at z = 0. We find that 20 per cent of stars with Z∗<0.1Z⊙ form after z = 2, and that such stars are still forming in galaxies of all masses at z = 0 today. Moreover, most low-metallicity stars at z = 0 reside in massive galaxies. We analyse the radial distribution of low-metallicity star formation and discuss the curious case of seven galaxies in TNG50 that form stars from primordial gas even at z = 0.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Royal Astronomical Society
ISSN: 0035-8711
Date of First Compliant Deposit: 12 May 2022
Date of Acceptance: 11 March 2022
Last Modified: 02 May 2023 13:58

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