论文标题
从Illustristng模拟得出的快速无线电爆发宿主星系的分散度量
Dispersion measures of fast radio burst host galaxies derived from IllustrisTNG simulation
论文作者
论文摘要
我们计算由快速无线电爆发（FRB）的宿主星系贡献的色散度量（DMS）。基于一些宿主星系观测，已经从Illustristng仿真中选择了大量具有与观察到的特性相似的星系样本。它们用于计算主机Galaxy DMS的分布，用于重复和不重复的FRB。对于重复FRB，我们通过假设突发站点在主机星系中追踪恒星形成率，从而推断出FRB 121102和FRB 180916等FRB的DM $ _ {\ MATHRM {host}} $。 DM $ _ {\ Mathrm {host}} $中值是$ 35（1+Z）^{1.08} $和$ 96（1+Z）^{0.83} $ PC CM $^{ - 3} $，分别为FRB 121102和FRB 180916。在另一种情况下，dm $ _ {\ mathrm {host}} $的中位数约为$ 30-70 $ pc cm $^{ - 3} $，对于红移范围$ z = 0.1-1.5 $的非重复的frbs，假设这些爆发位置是繁殖的位置，则是biartial neutmon netron netical netical netrun natry netrun sater star的位置。在这种情况下，可以通过$ 33（1+Z）^{0.84} $ PC CM $^{ - 3} $计算的中值DM $ _ {\ Mathrm {host}} $的演变。 DM $ _ {\ Mathrm {host}} $重复和非重复FRB的分布可以很好地适合日志正常函数。我们的结果可用于推断非定位的FRB的红移。
We calculate the dispersion measures (DMs) contributed by host galaxies of fast radio bursts (FRBs). Based on a few host galaxy observations, a large sample of galaxy with similar properties to observed ones has been selected from the IllustrisTNG simulation. They are used to compute the distributions of host galaxy DMs for repeating and non-repeating FRBs. For repeating FRBs, we infer the DM$ _{\mathrm{host}} $ for FRBs like FRB 121102 and FRB 180916 by assuming that the burst sites are tracing the star formation rates in host galaxies. The median DM$_{\mathrm{host}}$ are $35 (1+z)^{1.08}$ and $96(1+z)^{0.83}$ pc cm$^{-3}$ for FRBs like FRB 121102 and FRB 180916, respectively. In another case, the median of DM$_{\mathrm{host}}$ is about $30 - 70$ pc cm$^{-3}$ for non-repeating FRBs in the redshift range $z=0.1-1.5$, assuming that the burst sites are the locations of binary neutron star mergers. In this case, the evolution of the median DM$_{\mathrm{host}}$ can be calculated by $33(1+z)^{0.84}$ pc cm$^{-3}$. The distributions of DM$_{\mathrm{host}}$ of repeating and non-repeating FRBs can be well fitted with the log-normal function. Our results can be used to infer redshifts of non-localized FRBs.
