arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1909.05779astro-ph.HE
收藏

室女星系团方向的快速射电暴

A fast radio burst in the direction of the Virgo cluster

Devansh Agarwal, Duncan R. Lorimer, Anastasia Fialkov, Keith W. Bannister, Ryan M. Shannon, Wael Farah, Shivani Bhandari, Jean-Pierre Macquart, Chris Flynn, Giu… 展开作者

Devansh Agarwal, Duncan R. Lorimer, Anastasia Fialkov, Keith W. Bannister, Ryan M. Shannon, Wael Farah, Shivani Bhandari, Jean-Pierre Macquart, Chris Flynn, Giuliano Pignata, Nicolas Tejos, Benjamin Gregg, Stefan Osłowski, Kaustubh Rajwade, Mitchell B. Mickaliger, Benjamin W. Stappers, Di Li, Weiwei Zhu, Lei Qian, Youling Yue, Pei Wang, Abraham Loeb

摘要:

如果本征微弱的快速射电暴(FRB)数量众多,那么邻近星系团方向的快速射电暴(FRB)速率预计将高于平均宇宙学速率。在本文中,我们描述了一个有针对性的搜索附近的室女星系团的核心微弱FRB使用澳大利亚平方公里阵列探路者望远镜。在300小时的观测过程中,我们发现了一个爆发,FRB 180417,其色散测量值为DM $=474.8$ cm $^{-3}$ pc。FRB被几台射电望远镜跟踪了27小时,但没有发现重复爆发。使用PROMPT 5望远镜对FRB 180417进行的光学跟踪显示,在$R$波段20.1等以下没有发现新的来源。我们认为FRB 180417可能位于室女星系团的后面,因为银河系和星系团内的DM贡献与FRB的DM相比很小,并且视线中没有星系。未探测到来自室女座的FRB限制了FRB光度函数的暗端斜率$α<1.52$(在68%置信限)和最小光度$L_{\rm min}\gtrsim 2\times 10^{40}$ erg s $^{-1}$(在68%置信限),假设$10^4$ FRB的宇宙FRB率天空$^{-1}$日$^{-1}$,流量超过1 Jy,位于红移为1的位置。进一步的FRB调查的星系团与高灵敏度的仪器将收紧约束的光度函数的暗端,因此,强烈鼓励。

英文摘要:

The rate of fast radio bursts (FRBs) in the direction of nearby galaxy clusters is expected to be higher than the mean cosmological rate if intrinsically faint FRBs are numerous. In this paper, we describe a targeted search for faint FRBs near the core of the Virgo cluster using the Australian Square Kilometer Array Pathfinder telescope. During 300 hr of observations, we discovered one burst, FRB 180417, with dispersion measure DM $=474.8$ cm$^{-3}$pc. The FRB was promptly followed up by several radio telescopes for 27 h, but no repeat bursts were detected. An optical follow-up of FRB 180417 using the PROMPT5 telescope revealed no new sources down to an $R$-band magnitude of 20.1. We argue that FRB 180417 is likely behind the Virgo cluster as the Galactic and intracluster DM contribution are small compared to the DM of the FRB, and there are no galaxies in the line of sight. The non-detection of FRBs from Virgo constrains the faint-end slope, $α<1.52$ (at 68\% confidence limit), and the minimum luminosity, $L_{\rm min}\gtrsim 2\times 10^{40}$ erg s$^{-1}$ (at 68\% confidence limit), of the FRB luminosity function assuming cosmic FRB rate of $10^4$ FRBs sky$^{-1}$ day$^{-1}$ with flux above 1 Jy located out to redshift of 1. Further FRB surveys of galaxy clusters with high-sensitivity instruments will tighten the constraints on the faint end of the luminosity function and, thus, are strongly encouraged.

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。

↑