arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.13935astro-ph.HEastro-ph.COastro-ph.GA
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快速射电暴宿主星系色散的IllustrisTNG模拟

Dispersion measures of fast radio burst host galaxies derived from IllustrisTNG simulation

G. Q. Zhang, Hai Yu, J. H. He, F. Y. Wang

摘要:

本文计算了快射电爆发(FRB)主星系的色散测度(DM)。基于对几个宿主星系的观测,从IllustrisTNG模拟中选择了一个与观测星系具有相似性质的大样本星系。它们被用来计算主星系DM的分布,重复和非重复的FRB。对于重复的FRB,我们推断DM $ _{\mathrm{host}} $ FRB 121102和FRB 180916通过假设的爆发网站跟踪恒星形成率在宿主星系。对于FRB 121102和FRB 180916,中位DM $_{\mathrm{host}}$分别为$35 (1+z)^{1.08}$和$96(1+z)^{0.83}$ pc cm $^{-3}$。在另一种情况下,对于红移范围$z=0.1-1.5$的非重复FRB,DM $_{\mathrm{host}}$的中值约为$30 - 70$ pc cm $^{-3}$,假设爆发点是双星合并的位置。在这种情况下,可以通过$33(1+z)^{0.84}$ pc cm $^{-3}$计算中值DM $_{\mathrm{host}}$的演变。重复和非重复FRB的DM $_{\mathrm{host}}$的分布可以很好地拟合对数正态函数。我们的结果可用于推断非定域FRB的红移。

英文摘要:

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.

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