论文标题
银河系光环对使用X射线吸收的分散量的贡献量的经验估计值
Empirical estimates of the Galactic halo contribution to the dispersion measures of extragalactic fast radio bursts using X-ray absorption
论文作者
论文摘要
我们提供了银河色散度量（$ dm_ {gal} $）的经验清单，沿着72个视线沿着72张视线构成了速效快速无线电爆发。它独立于任何银河系模型，即，我们不假定磁盘或光环的密度，光环的空间范围，Baryonic质量含量或任何此类外部约束来测量$ dm_ {gal} $。我们使用21厘米，UV，EUV和X射线数据来解释不同的阶段，并发现$ dm_ {gal} $由X射线吸收探测的热阶段主导。与以前的研究相比，我们根据N（\ oviin）和f $ _ {OVII} $的测量结果进行了改进，从而更好地估计了热相贡献。中值$ dm_ {gal} $ = 64 $^{+20} _ { - 23} $ cm $^{ - 3} $ pc，具有68 \％（90 \％）置信区间为33---172（23-------660）cm $^{ - 3} $ pc。 $ dm_ {gal} $似乎没有带有银河经度或纬度的任何趋势，并且在简单的磁盘+球形晕模型预测的值周围存在很大的散布。我们的测量结果可提供与以前研究的独立于$ dm_ {gal} $的更完整和准确的估计。我们提供一个表格和一个代码，用于检索天空中任何位置的FRB的$ dm_ {gal} $。
We provide an empirical list of the Galactic dispersion measure ($DM_{Gal}$) contribution to the extragalactic fast radio bursts along 72 sightlines. It is independent of any model of the Galaxy, i.e., we do not assume the density of the disk or the halo, spatial extent of the halo, baryonic mass content, or any such external constraints to measure $DM_{Gal}$. We use 21-cm, UV, EUV and X-ray data to account for different phases, and find that $DM_{Gal}$ is dominated by the hot phase probed by X-ray absorption. We improve upon the measurements of N(\oviin) and f$_{OVII}$ compared to previous studies, thus providing a better estimate of the hot phase contribution. The median $DM_{Gal}$=64$^{+20}_{-23}$ cm$^{-3}$ pc, with a 68\% (90\%) confidence interval of 33--172 (23--660) cm$^{-3}$ pc. The $DM_{Gal}$ does not appear to follow any trend with the galactic longitude or latitude, and there is a large scatter around the values predicted by simple disk+spherical halo models. Our measurements provide more complete and accurate estimates of $DM_{Gal}$ independent from the previous studies. We provide a table and a code to retrieve $DM_{Gal}$ for any FRB localized in the sky.
