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

• Verfasst von: Enzi, Wolfgang [VerfasserIn]
• Verfasst von: Murgia, Riccardo [VerfasserIn]
• Verfasst von: Newton, Oliver [VerfasserIn]
• Verfasst von: Vegetti, Simona [VerfasserIn]
• Verfasst von: Frenk, Carlos [VerfasserIn]
• Verfasst von: Viel, Matteo [VerfasserIn]
• Verfasst von: Cautun, Marius [VerfasserIn]
• Verfasst von: Fassnacht, Christopher D [VerfasserIn]
• Verfasst von: Auger, Matt [VerfasserIn]
• Verfasst von: Despali, Giulia [VerfasserIn]
• Verfasst von: McKean, John [VerfasserIn]
• Verfasst von: Koopmans, Léon V E [VerfasserIn]
• Verfasst von: Lovell, Mark [VerfasserIn]
• Titel: Joint constraints on thermal relic dark matter from strong gravitational lensing, the Ly α forest, and Milky Way satellites
• Verf.angabe: 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
• E-Jahr: 2021
• Jahr: 10 July 2021
• Umfang: 15 S.
• Fussnoten: Gesehen am 25.01.2022
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2021
• Band/Heft Quelle: 506(2021), 4, Seite 5848-5862
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stab1960
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1787088766

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.