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Population III X-ray binaries and their impact on the early universe

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The first population of X-ray binaries (XRBs) is expected to affect the thermal and ionization states of the gas in the early Universe. Although these X-ray sources are predicted to have important implications for high-redshift observable signals, such as the hydrogen 21-cm signal from cosmic dawn a...

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Main Authors: Sanches Sartorio, Nina (Author) , Fialkov, A (Author) , Hartwig, T (Author) , Mirouh, G M (Author) , Izzard, R G (Author) , Magg, Mattis (Author) , Klessen, Ralf S. (Author) , Glover, Simon (Author) , Chen, Li-Hsin (Author) , Tarumi, Y (Author) , Hendriks, D D (Author)
Format: Article (Journal)
Language:English
Published: 10 March 2023
In: Monthly notices of the Royal Astronomical Society
Year: 2023, Volume: 521, Issue: 3, Pages: 4039-4055
ISSN:1365-2966
DOI:10.1093/mnras/stad697
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stad697
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Author Notes:Nina S. Sartorio, A. Fialkov, T. Hartwig, G.M. Mirouh, R.G. Izzard, M. Magg, R.S. Klessen, S.C.O. Glover, L. Chen, Y. Tarumi and D.D. Hendriks
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Summary:The first population of X-ray binaries (XRBs) is expected to affect the thermal and ionization states of the gas in the early Universe. Although these X-ray sources are predicted to have important implications for high-redshift observable signals, such as the hydrogen 21-cm signal from cosmic dawn and the cosmic X-ray background, their properties are poorly explored, leaving theoretical models largely uninformed. In this paper we model a population of X-ray binaries arising from zero metallicity stars. We explore how their properties depend on the adopted initial mass function (IMF) of primordial stars, finding a strong effect on their number and X-ray production efficiency. We also present scaling relations between XRBs and their X-ray emission with the local star formation rate, which can be used in sub-grid models in numerical simulations to improve the X-ray feedback prescriptions. Specifically, we find that the uniformity and strength of the X-ray feedback in the intergalactic medium is strongly dependant on the IMF. Bottom-heavy IMFs result in a smoother distribution of XRBs, but have a luminosity orders of magnitude lower than more top-heavy IMFs. Top-heavy IMFs lead to more spatially uneven, albeit strong, X-ray emission. An intermediate IMF has a strong X-ray feedback while sustaining an even emission across the intergalactic medium. These differences in X-ray feedback could be probed in the future with measurements of the cosmic dawn 21-cm line of neutral hydrogen, which offers us a new way of constraining population III IMF.
Item Description:Gesehen am 05.07.2023
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stad697

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