Population III stars around the Milky Way
Yutaka Komiya, Takuma Suda, and Masayuki Y. Fujimoto

TL;DR
This paper investigates the escape and distribution of Population III stars from early mini-halos, suggesting many could survive unpolluted and be observable today, with implications for understanding the Milky Way's formation.
Contribution
It models the ejection of low-mass Pop~III stars from mini-halos and predicts their spatial distribution, highlighting their potential to be observed as pristine stars.
Findings
Hundreds to tens of thousands of Pop~III stars escape from mini-halos.
Escaped stars distribute beyond the stellar halo, following a dark matter-like density profile.
Some escaped stars reach intergalactic space, remaining unpolluted.
Abstract
We explore the possibility of observing Population III (Pop~III) stars, born of the primordial gas. Pop~III stars with masses below should survive to date though are not observed yet, but the existence of stars with low metallicity as [Fe/H] in the Milky Way halo suggests the surface pollution of Pop~III stars with accreted metals from the interstellar gas after birth. In this paper, we investigate the runaway of Pop~III stars from their host mini-halos, considering the ejection of secondary members from binary systems when their massive primaries explode as supernovae. These stars save them from the surface pollution. By computing the star formation and chemical evolution along with the hierarchical structure formation based on the extended Press--Schechter merger trees, we demonstrate that several hundreds to tens of thousands of low-mass Pop~III stars…
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