快速射电暴寄主星系色散量的估计

定位快速射电暴(Fast Radio Burst, FRB)以及确认其寄主星系至今仍是一个具有挑战性的难题,截至2021年4月已确认13个快速射电暴的寄主星系,其中只有3个重复暴,其余都是非重复暴.快速射电暴的寄主星系对快速射电暴起源的探索起着非常重要的作用,约束着快速射电暴前身星模型.对这些已确认寄主星系的FRB进行研究,发现FRB寄主星系对色散量(Dispersion Measure, DM)的贡献在一定范围内波动(0–240 pc·cm-3),并且寄主星系对DM的贡献与寄主星系的性质(恒星形成率、金属丰度)也可能具有关联性.寄主星系恒星形成率、金属丰度与色散量的统计关系对FRB邻近环境的研究有着重要意义.

Estimates of the Dispersion Measures Contribution from Fast Host Galaxies of Radio Bursts

Thirteen FRBs (Fast Radio Bursts) with identified host galaxies have been published so far, among them three are repeating and the rest are non-repeating. And the localization of FRBs and identification of the host galaxies still remain a challenging job today. The host galaxy of FRBs plays a very important role in the exploration of the origin of FRBs, and constraining the model of the progenitor. This paper studies the 13 localized FRBs. We find that the DM (Dispersion Measure) contributions from host galaxy fluctuates within certain range (0--240pc$\cdot $cm^-3). In addition, the DM contributions from host galaxy are likely correlated with properties of host galaxy (e.g. SFR (Star Formation Rate), metallicity). The statistical association between SFR (metallicity) and DM contributions from host galaxy is of important significance for study of FRBs adjacent environment.