五个定域快速射电暴中IGM重子质量分数的宇宙学不敏感估计
Cosmology-insensitive estimate of IGM baryon mass fraction from five localized fast radio bursts
摘要：
迄今为止，已有5个快速射电暴（FRB）被定位，其中包括3个明显不重复的FRB 180924、FRB 181112和FRB 190523，以及2个重复的FRB 121102和FRB 180916.J0158+65。我们将我们最近开发的方法（Li et al. 2019）应用于这五个局部FRB，以给出IGM中重子质量分数的宇宙学不敏感估计，$f_{\rm IGM}$。利用5个FRB的色散测度（DM）和光度距离$d_{\rm L}$数据（由FRB红移和相同红移的Ia型超新星的$d_{\rm L}$推断），我们对局部$f_{\rm IGM} = 0.84^{+0.16}_{-0.22}$进行了约束，没有红移依赖的证据.这个宇宙学不敏感的估计$f_{\rm IGM}$从FRB的观测是在很好的协议与以前的约束，使用其他探头。此外，仅使用三个明显不重复的FRB，我们得到了稍微宽松但一致的结果$f_{\rm IGM} = 0.74^{+0.24}_{-0.18}$。在这两种情况下，合理的估计宿主星系DM的贡献（${\rm DM_{host}}$）可以通过模拟它作为一个函数的恒星形成率。随着FRB本地化的快速进展，$f_{\rm IGM}$和${\rm DM_{host}}$的约束有望得到显著改善。
英文摘要：
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.
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