2018/01/31 by S. Vegetti, G. Despali, Giulia Despali +4
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Cold dark matter #Cosmology #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Dark matter halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitational lens #Gravitational microlensing #Halo #Hot dark matter #Neutrino #Neutrino oscillation #Particle physics #Physics #Redshift #Sterile neutrino #Warm dark matter #astro-ph.CO
paper · pdf · doi:10.1093/mnras/sty2393
Accepted for publication on MNRAS
openalex publication_date 2018/09/03 · arxiv created 2018/10/09 · arxiv updated 2018/10/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We use the observed amount of subhaloes and line-of-sight dark matter haloes in a sample of 11 gravitational lens systems from the Sloan Lens ACS Survey to constrain the free-streaming properties of the dark matter particles. In particular, we combine the detection of a small-mass dark matter halo by Vegetti et al. with the non-detections by Vegetti et al. and compare the derived subhalo and halo mass functions with expectations from cold dark matter (CDM) and resonantly produced sterile neutrino models. We constrain the half-mode mass, i.e. the mass scale at which the linear matter power spectrum is reduced by 50 per cent relatively to the CDM model, to be log Mhm[M⊙] < 12.0 (equivalent thermal relic mass mth > 0.3 keV) at the 2σ level. This excludes sterile neutrino models with neutrino masses ms < 0.8 keV at any value of L6. Our constraints are weaker than currently provided by the number of Milky Way satellites, observations of the 3.5 keV X-ray line, and the Lyman α forest. However, they are more robust than the former as they are less affected by baryonic processes. Moreover, unlike the latter, they are not affected by assumptions on the thermal histories for the intergalactic medium. Gravitational lens systems with higher data quality and higher source and lens redshift are required to obtain tighter constraints.