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Joint constraints on thermal relic dark matter from strong gravitational lensing, the Ly α forest, and Milky Way satellites

We derive joint constraints on the warm dark matter (WDM) half-mode scale by combining the analyses of a selection of astrophysical probes: strong gravitational lensing with extended sources, the Ly α forest, and the number of luminous satellites in the Milky Way. We derive an upper limit of λhm = 0...

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Main Authors: Enzi, Wolfgang (Author) , Murgia, Riccardo (Author) , Newton, Oliver (Author) , Vegetti, Simona (Author) , Frenk, Carlos (Author) , Viel, Matteo (Author) , Cautun, Marius (Author) , Fassnacht, Christopher D (Author) , Auger, Matt (Author) , Despali, Giulia (Author) , McKean, John (Author) , Koopmans, Léon V E (Author) , Lovell, Mark (Author)
Format: Article (Journal)
Language:English
Published: 10 July 2021
In: Monthly notices of the Royal Astronomical Society
Year: 2021, Volume: 506, Issue: 4, Pages: 5848-5862
ISSN:1365-2966
DOI:10.1093/mnras/stab1960
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stab1960
Resolving-System, lizenzpflichtig, Volltext: https://academic.oup.com/mnras/article/506/4/5848/6318874
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Author Notes:Wolfgang Enzi, Riccardo Murgia, Oliver Newton, Simona Vegetti, Carlos Frenk, Matteo Viel, Marius Cautun, Christopher D. Fassnacht, Matt Auger, Giulia Despali, John McKean, Léon V.E. Koopmans and Mark Lovell
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Summary:We derive joint constraints on the warm dark matter (WDM) half-mode scale by combining the analyses of a selection of astrophysical probes: strong gravitational lensing with extended sources, the Ly α forest, and the number of luminous satellites in the Milky Way. We derive an upper limit of λhm = 0.089 Mpc h−1 at the 95 per cent confidence level, which we show to be stable for a broad range of prior choices. Assuming a Planck cosmology and that WDM particles are thermal relics, this corresponds to an upper limit on the half-mode mass of Mhm < 3 × 107 M⊙ h−1, and a lower limit on the particle mass of mth > 6.048 keV, both at the 95 per cent confidence level. We find that models with λhm > 0.223 Mpc h−1 (corresponding to mth > 2.552 keV and Mhm < 4.8 × 108 M⊙ h−1) are ruled out with respect to the maximum likelihood model by a factor ≤1/20. For lepton asymmetries L6 > 10, we rule out the 7.1 keV sterile neutrino dark matter model, which presents a possible explanation to the unidentified 3.55 keV line in the Milky Way and clusters of galaxies. The inferred 95 percentiles suggest that we further rule out the ETHOS-4 model of self-interacting DM. Our results highlight the importance of extending the current constraints to lower half-mode scales. We address important sources of systematic errors and provide prospects for how the constraints of these probes can be improved upon in the future.
Item Description:Gesehen am 25.01.2022
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stab1960

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