A Distant Fast Radio Burst Associated with Its Host Galaxy by the Very Large Array
A Distant Fast Radio Burst Associated with Its Host Galaxy by the Very Large Array
复制标题
DOI：
10.3847/1538-4357/aba4ac
复制
发表时间：
2020-08-01
影响因子：
4.9
通讯作者：
Simha, Sunil
中科院分区：
文献类型：
--
作者：
Law, Casey J.;Butler, Bryan J.;Simha, Sunil
本文介绍了Karl G.Jansky甚大阵列(VLA)和realfast搜索系统发现的一种新的快速射电爆发(FRB)及其亚极秒定位。FRB于2019年6月14日被发现，分散度为959 pC cm(-3)。这是所有局部化FRB中最高的DM，其测量的0.6Jy毫秒的爆发通量几乎低于所有其他FRB。在15小时的VLA观测和153小时的CHME/FRB观测中未检测到源重复。我们描述了一套统计和数据质量测试，我们用来验证事件的重要性及其定位精度。Keck和Gemini的后续光学/红外测光将FRB与一对r类似于23 MAG的星系联系在一起。与宿主星系有关的如此重要的射电瞬变的虚警率约为3x10(-4)小时(-1)。这两个假定的宿主星系的z(Phot)的光度红移类似于0.6，但颜色和恒星质量不同。将宿主距离与色散测量所暗示的距离进行比较，表明与FRB环境或宿主星系/星系有关的电子柱密度适中(类似于50pC厘米(-3))。
We present the discovery and subarcsecond localization of a new fast radio burst (FRB) by the Karl G. Jansky Very Large Array (VLA) and realfast search system. The FRB was discovered on 2019 June 14 with a dispersion measure of 959 pc cm(-3). This is the highest DM of any localized FRB and its measured burst fluence of 0.6 Jy ms is less than nearly all other FRBs. The source is not detected to repeat in 15 hr of VLA observing and 153 hr of CHIME/FRB observing. We describe a suite of statistical and data quality tests we used to verify the significance of the event and its localization precision. Follow-up optical/infrared photometry with Keck and Gemini associate the FRB with a pair of galaxies with r similar to 23 mag. The false-alarm rate for radio transients of this significance that are associated with a host galaxy is roughly 3 x 10(-4) hr(-1). The two putative host galaxies have similar photometric redshifts of z(phot) similar to 0.6, but different colors and stellar masses. Comparing the host distance to that implied by the dispersion measure suggests a modest (similar to 50 pc cm(-3)) electron column density associated with the FRB environment or host galaxy/galaxies.