Intensity mapping surveys of neutral hydrogen (HI) are a new way to measure the large-scale matter distribution of our Universe over a wide range of redshifts, and thus constrain cosmological parameters describing the Universal expansion. This technique can observe the HI evolution over a wide range of redshifts including the Epoch of Reionization and thus a major observable for the SKA Observatory. I will give an introduction into the HI intensity mapping technique at low redshift and review the latest results from observations with the South African MeerKAT telescope under the MeerKLASS collaboration. Particularly, after two successful pilot surveys in the L-Band with detection at z~0.45, we are conducting a large survey accessing 0.5.
Local contact & organisation: Antonin Corinaldi
University of Manchester