Search for correlations between host properties and DM host of fast radio bursts: constraints on the baryon mass fraction in IGM *

Abstract

Abstract The application of fast radio bursts (FRBs) as probes for investigating astrophysics and cosmology requires proper modelling of the dispersion measures of the Milky Way ( ) and host galaxy ( ). can be estimated using the Milky Way electron models, such as the NE2001 model and YMW16 model. However, is hard to model due to limited information on the local environment of the FRBs. In this study, using 17 well-localized FRBs, we search for possible correlations between and the properties of the host galaxies, such as the redshift, stellar mass, star-formation rate, age of galaxy, offset of the FRB site from the galactic center, and half-light radius. We find no strong correlation between and any of the host properties. Assuming that is a constant for all host galaxies, we constrain the fraction of the baryon mass in the intergalactic medium today to be . If we model as a log-normal distribution, however, we obtain a larger value, . Based on the limited number of FRBs, no strong evidence for a redshift evolution of is found.