Dispersion measures of fast radio burst host galaxies derived from IllustrisTNG simulation

Understand

We calculate the dispersion measures (DMs) contributed by host galaxies of fast radio bursts (FRBs).

• Based on a few host galaxy observations, a large sample of galaxy with similar properties to observed ones has been selected from the IllustrisTNG simulation.
• They are used to compute the distributions of host galaxy DMs for repeating and non-repeating FRBs.
• For repeating FRBs, we infer the DM$ _{\mathrm{host}} $ for FRBs like FRB 121102 and FRB 180916 by assuming that the burst sites are tracing the star formation rates in host galaxies.