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Enzi, W, Murgia, R, Newton, O, Vegetti, S, Frenk, C, Viel, M, Cautun, M, Fassnacht, CD, Auger, M, Despali, G, McKean, J, Koopmans, LVE and Lovell, M (2021) Joint constraints on thermal relic dark matter from strong gravitational lensing, the Ly alpha forest, and Milky Way satellites. Monthly Notices of the Royal Astronomical Society, 506 (4). pp. 5848-5862. ISSN 0035-8711
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Joint constraints on thermal relic dark matter from strong gravitational lensing, the Ly α forest, and Milky Way satellites.pdf - Published Version Download (887kB) | Preview |
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 |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| Related URLs: | |
| Date Deposited: | 01 Apr 2022 09:33 |
| Last Modified: | 01 Apr 2022 09:45 |
| DOI or ID number: | 10.1093/mnras/stab1960 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/16572 |
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