2020/04/17 by Zhengxiang Li, He Gao, Jun-Jie Wei +5 · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics #Baryon #Cosmology #Galaxy #Gamma-ray bursts and supernovae #Luminosity #Luminosity distance #Mass fraction #Physics #Pulsars and Gravitational Waves Research #Redshift #Supernova #astro-ph.HE #gr-qc
paper · pdf · doi:10.1093/mnrasl/slaa070
6 pages, 3 figures, accepted for publication in MNRAS Letters
arxiv created 2020/04/17 · openalex publication_date 2020/05/15 · arxiv updated 2020/05/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 to these five localized FRBs to give a cosmology-insensitive estimate of the fraction of baryon mass in the intergalactic medium, fIGM. Using the measured dispersion measure (DM) and luminosity distance dL data (inferred from the FRB redshifts and dL 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 fIGM 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 (DMhost) can be achieved by modelling it as a function of star formation rate. The constraints on both fIGM and DMhost are expected to be significantly improved with the rapid progress in localizing FRBs.