Testing models for dark matter with gravitational lensing

Mittwoch, 24. April 2019, 14:00 - 15:30
Veranstaltungsort* Bibliothek
The cold dark matter model for galaxy formation predicts that there should be a large abundance of low mass haloes throughout the Universe. To test this, the SHARP collaboration uses high resolution imaging at infra-red and radio wavelengths to study the perturbing effect low mass dark matter dominated galaxies have on the images produced by a strong gravitational lens. In this talk, I will present the latest constraints on the dark matter halo mass function using the gravitational lensing technique. In particular, I will present new high resolution imaging of extended gravitational arcs with the global VLBI array at 1.7 GHz that probe haloes at the million solar mass limit, a regime where different models (cold and warm) diverge.
 


: John Mc Kean