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The Milky Way's total satellite population and constraining the mass of the warm dark matter particle

Newton, O, Cautun, M, Jenkins, A, Frenk, CS and Helly, JC (2019) The Milky Way's total satellite population and constraining the mass of the warm dark matter particle. Proceedings of the International Astronomical Union, 14 (S344). pp. 109-113. ISSN 1743-9213

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The Milky Way’s (MW) satellite population is a powerful probe of warm dark matter (WDM) models as the abundance of small substructures is very sensitive to the properties of the WDM particle. However, only a partial census of the MW’s complement of satellite galaxies exists because surveys of the MW’s close environs are incomplete both in depth and in sky coverage. We present a new Bayesian analysis that combines the sample of satellites recently discovered by the Dark Energy Survey (DES) with those found in the Sloan Digital Sky Survey (SDSS) to estimate the total satellite galaxy luminosity function down to Mv = 0. We find that there should be at least 124+40−27124−27+40 (68% CL, statistical error) satellites as bright or brighter than Mv = 0 within 300 kpc of the Sun, with only a weak dependence on MW halo mass. When it comes online the Large Synoptic Survey Telescope should detect approximately half of this population. We also show that WDM models infer the same number of satellites as in ΛCDM, which will allow us to rule out those models that produce insufficient substructure to be viable.

Item Type: Article
Additional Information: This is the accepted version of a paper published in Proceedings of the International Astronomical Union. https://doi.org/10.1017/S1743921318006464
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Cambridge University Press
Related URLs:
Date Deposited: 01 Apr 2022 09:39
Last Modified: 01 Apr 2022 09:45
DOI or ID number: 10.1017/S1743921318006464
Editors: McQuinn, KBW and Stierwalt, S
URI: https://researchonline.ljmu.ac.uk/id/eprint/16573
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