Description
Fast radio bursts (FRBs) are intense pulses of radio emission occurring on timescales of milliseconds with yet unknown progenitors. To help solve their mysterious origin, as well as better use FRBs as powerful tools for cosmology study and galaxy gas dynamics, effective localisation of FRBs to their host galaxies and follow-up observations are necessary. I present recent results from the Commensal Real-time ASKAP Fast Transients (CRAFT) survey, where with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope several tens have been localised and observed in optical and neutral hydrogen (HI) studies. In particular, I will present the results of dedicated efforts to compile the first statistically significant sample of HI follow-up of FRBs, and correlation results for newly measured scattering timescales from the CRAFT survey with their host galaxy global properties. In the latter study, we find a strong positive correlation for the scattering time with both the stellar mass-weighted age and the gas-phase metallicity, which is potentially attributed to cooler and clumpier metal-rich gas in the interstellar medium increasing FRB scattering times.
