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# Cosmology-insensitive estimate of IGM baryon mass fraction from five localized fast radio bursts

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### Abstract

Five fast radio bursts (FRBs), including three apparently non-repeating ones FRB 180924, FRB 181112, and FRB 190523, and two repeaters, FRB 121102 and FRB 180916.J0158+65, have already been localized so far. We apply a method developed recently by us (Li et al. 2019) to these five localized FRBs to give a cosmology-insensitive estimate of the fraction of baryon mass in the IGM, $$f_{\rm IGM}$$. Using the measured dispersion measure (DM) and luminosity distance $$d_{\rm L}$$ data (inferred from the FRB redshifts and $$d_{\rm L}$$ of type Ia supernovae at the same redshifts) of the five FRBs, we constrain the local $$f_{\rm IGM} = 0.84^{+0.16}_{-0.22}$$ with no evidence of redshift dependence. This cosmology-insensitive estimate of $$f_{\rm IGM}$$ from FRB observations is in excellent agreement with previous constraints using other probes. Moreover, using the three apparently non-repeating FRBs only we get a little looser but consistent result $$f_{\rm IGM} = 0.74^{+0.24}_{-0.18}$$. In these two cases, reasonable estimations for the host galaxy DM contribution ($${\rm DM_{host}}$$) can be achieved by modelling it as a function of star formation rate. The constraints on both $$f_{\rm IGM}$$ and $${\rm DM_{host}}$$ are expected to be significantly improved with the rapid progress in localizing FRBs.

### Author and article information

###### Journal
17 April 2020
###### Article
2004.08393