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

Enzi, W., Murgia, R., Newton, O., Vegetti, S., Frenk, C., Viel, M., et al. (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), 5848-5862. doi:10.1093/mnras/stab1960.

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 Creators:
Enzi, Wolfgang1, Author              
Murgia, Riccardo, Author
Newton, Oliver, Author
Vegetti, Simona1, Author              
Frenk, Carlos, Author
Viel, Matteo, Author
Cautun, Marius, Author
Fassnacht, Christopher D., Author
Auger, Matt, Author
Despali, Giulia, Author
McKean, John, Author
Koopmans, Leon V. E., Author
Lovell, Mark, Author
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1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 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.

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Language(s): eng - English
 Dates: 2021-07-10
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab1960
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Title: Monthly Notices of the Royal Astronomical Society
  Abbreviation : Mon. Not. Roy. Astron. Soc.
Source Genre: Journal
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Pages: - Volume / Issue: 506 (4) Sequence Number: - Start / End Page: 5848 - 5862 Identifier: ISSN: 0035-8711
ISSN: 1365-8711