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arXiv 1702.07085astro-ph.COastro-ph.HE
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作为快速射电暴起源和宿主环境探测的大尺度成团

Large-scale clustering as a probe of the origin and the host environment of fast radio bursts

Masato Shirasaki, Kazumi Kashiyama, Naoki Yoshida

摘要:

我们建议使用度尺度的角度聚类的快速射电暴(FRB),以确定其起源和宿主星系的人口。我们研究了角位置和色散测度(DM)的自相关以及与星系的互相关中的信息含量。我们发现,与斯隆数字巡天(SDSS)星系的互相关将与FRB的平均物理量严格的约束。如果在SDSS字段中以$\lesssim \rm deg$分辨率检测到$\sim$ 10,000个FRB,利用$100\, {\rm pc}/{\rm cm}^3$的内禀DM散射进行的聚类分析可以约束$z\lt1$的整体自由电子丰度和FRB宿主星系的大尺度偏差(宿主星系分布与宇宙物质密度场的统计关系)(具有$68\%$置信水平)分别为$\sim10\%$和$\sim20\%$。结合DM的概率分布函数和聚类结果,还可以确定FRB速率相对于全球恒星形成速率的平均近源色散度量和延迟时间分布。我们的方法将是对高分辨率($\ll {\rm deg}$)事件定位的补充,VLA和VLBI用于识别FRB的起源和源环境。我们强烈鼓励未来的观测计划,如CHIME,UTMOST和HIRAX在SDSS领域调查FRB。

英文摘要:

We propose to use degree-scale angular clustering of fast radio bursts (FRBs) to identify their origin and the host galaxy population. We study the information content in autocorrelation of the angular positions and dispersion measures (DM) and in cross-correlation with galaxies. We show that the cross-correlation with Sloan Digital Sky Survey (SDSS) galaxies will place stringent constraints on the mean physical quantities associated with FRBs. If $\sim$10,000 FRBs are detected with $\lesssim \rm deg$ resolution in the SDSS field, the clustering analysis with the intrinsic DM scatter of $100\, {\rm pc}/{\rm cm}^3$ can constrain the global abundance of free electrons at $z\lt1$ and the large-scale bias of FRB host galaxies (the statistical relation between the distribution of host galaxies and cosmic matter density field) with fractional errors (with a $68\%$ confidence level) of $\sim10\%$ and $\sim20\%$, respectively. The mean near-source dispersion measure and the delay time distribution of FRB rates relative to the global star forming rate can be also determined by combining the clustering and the probability distribution function of DM. Our approach will be complementary to high-resolution ($\ll {\rm deg}$) event localization using e.g., VLA and VLBI for identifying the origin of FRBs and the source environment. We strongly encourage future observational programs such as CHIME, UTMOST, and HIRAX to survey FRBs in the SDSS field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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