The dispersion measure of Fast Radio Bursts host galaxies: estimation from cosmological simulations

ABSTRACT The dispersion measure (DM) of fast radio burst (FRB) encodes important information such as its distance, properties intervening medium. Based on simulations in the Illustris and IllustrisTNG projects, we analyse DM FRBs contributed by interstellar medium circumgalactic hosts, DMhost. We explore two population models – tracing star formation rate (SFR) stellar mass, i.e. young old progenitors, respectively. distribution DMhost shows significant differences at z = 0 between populations: mass model exhibits an excess low-DM end with respect to SFR model. (stellar mass) has a median value 179 (63) pc cm−3 for galaxies $M_*=10^{8\!-\!13}\, \mathrm{M}_{\odot }$ TNG100-1. Galaxies Illustris-1 have much smaller distributions deviate from lognormal function both models. Furthermore, populations differ moderately spatial offset host galaxy’s centre hosts. increases hosts when $M_* < 10^{10.5}\, }$, fluctuate higher mass. At 2, redshift. declines increasing With more localized events available future, statistics DMhost, galaxy centre, will be great helpful ascertain origin FRB. Meanwhile, FRB could help constrain baryon physics evolution.