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Finding the stars that reionized the Universe

Published online by Cambridge University Press:  07 March 2018

Mahavir Sharma
Affiliation:
Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham, UK, DH1 3LE, email: mahavir.sharma@durham.ac.uk
Tom Theuns
Affiliation:
Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham, UK, DH1 3LE, email: mahavir.sharma@durham.ac.uk
Carlos Frenk
Affiliation:
Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham, UK, DH1 3LE, email: mahavir.sharma@durham.ac.uk
Corresponding
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Abstract

We study the abundance of the remnants of stars that reionized the Universe in galaxies in the present day Universe using the eagle cosmological hydrodynamical simulation. High mass galaxies contain most of these ‘reionizers’. The fractional number of galaxies that do not host reionizers increases with decreasing stellar mass, M . For the galaxies that host reionizers, the fraction of mass of the galaxy in reionizers increases with decreasing M , such that the fraction is low (~10−4) for high mass galaxies and can be as high as 0.1 in low mass galaxies, M ≤ 107 M. In Milky-Way like galaxies, the distribution of reionizers is spatially more extended than that of normal stars.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

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Schaye, J., Crain, R. A., Bower, R. G., et al., 2015, MNRAS, 446, 521 CrossRefGoogle Scholar
Sharma, M., Theuns, T., Frenk, C., et al., 2017a, MNRAS, 468, 2176 CrossRefGoogle Scholar
Sharma, M., Theuns, T., Frenk, C., & Cooke, R. 2016, arXiv: 1611.03868Google Scholar
Sharma, M., Theuns, T., & Frenk, C. 2017b, MNRAS in prep. Google Scholar
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