Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

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

Enzi, Wolfgang and Murgia, Riccardo and Newton, Oliver and Vegetti, Simona and Frenk, Carlos and Viel, Matteo and Cautun, Marius and Fassnacht, Christopher D and Auger, Matt and Despali, Giulia and McKean, John and Koopmans, Léon V E and Lovell, Mark (2021) 'Joint constraints on thermal relic dark matter from strong gravitational lensing, the Ly α forest, and Milky Way satellites.', Monthly Notices of the Royal Astronomical Society, 506 (4). pp. 5848-5862.

Abstract

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 Type:Article
Full text:(VoR) Version of Record
Download PDF
(866Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/stab1960
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:29 June 2021
Date deposited:15 November 2021
Date of first online publication:10 July 2021
Date first made open access:15 November 2021

Save or Share this output

Export:
Export
Look up in GoogleScholar