The Astronomical Journal ( IF 5.3 ) Pub Date : 2021-01-22 , DOI: 10.3847/1538-3881/abd174 Calvin Leung 1, 2 , Juan Mena-Parra 1 , Kiyoshi Masui 1, 2 , Kevin Bandura 3, 4 , Mohit Bhardwaj 5 , P. J. Boyle 5, 6 , Charanjot Brar 5, 6 , Mathieu Bruneault 6 , Tomas Cassanelli 7, 8 , Davor Cubranic 9 , Jane F. Kaczmarek 10 , Victoria Kaspi 5, 6 , Tom Landecker 10 , Daniele Michilli 5, 6 , Nikola Milutinovic 9 , Chitrang Patel 5, 6, 7 , Ziggy Pleunis 5, 6 , Mubdi Rahman 7, 11 , Andre Renard 7 , Pranav Sanghavi 3, 4 , Ingrid H. Stairs 9 , Paul Scholz 7 , Keith Vanderlinde 7, 8
We demonstrate the blind interferometric detection and localization of two fast radio bursts (FRBs) with subarcminute precision on the 400 m baseline between the Canadian Hydrogen Intensity Mapping Experiment (CHIME) and the CHIME Pathfinder. In the same spirit as Very Long Baseline Interferometry (VLBI), the telescopes were synchronized to separate clocks, and the channelized voltage (herein referred to as baseband) data were saved to a disk with correlation performed offline. The simultaneous wide field of view and high sensitivity required for blind FRB searches implies a high data rate—6.5 terabits per second (Tb/s) for CHIME and 0.8 Tb s−1 for the Pathfinder. Since such high data rates cannot be continuously saved, we buffer data from both telescopes locally in memory for , and write to the disk upon receipt of a low-latency trigger from the CHIME Fast Radio Burst Instrument (CHIME/FRB). The deg2 field of view of the two telescopes allows us to use in-field calibrators to synchronize the two telescopes without needing either separate calibrator observations or an atomic timing standard. In addition to our FRB observations, we analyze bright single pulses from the pulsars B0329+54 and B0355+54 to characterize systematic localization errors. Our results demonstrate the successful implementation of key software, triggering, and calibration challenges for CHIME/FRB Outriggers: cylindrical VLBI outrigger telescopes which, along with the CHIME telescope, will localize thousands of single FRB events with sufficient precision to unambiguously associate a host galaxy with each burst.
中文翻译:
摘要VLBI技术用CHIME / FRB定位非重复性快速无线电突发
我们演示了加拿大氢强度测绘实验(CHIME)和CHIME Pathfinder之间在400 m基线上以亚弧度精度进行的两个快速无线电脉冲(FRB)的盲干涉检测和定位。按照与超长基线干涉测量法(VLBI)相同的精神,将望远镜同步到单独的时钟,并将通道化的电压(在此称为基带)数据保存到磁盘,并离线进行关联。盲目FRB搜索所需的同时广视角和高灵敏度意味着较高的数据速率-CHIME为每秒6.5 TB(Tb / s),探路者为0.8 Tb s -1。由于无法连续保存如此高的数据速率,因此我们将两个望远镜的数据本地缓存在内存中,以用于,并在收到CHIME快速无线电脉冲串仪器(CHIME / FRB)的低延迟触发后写入磁盘。的度2两个望远镜的视野允许我们使用现场校准器来同步两个望远镜,而无需单独的校准器观测或原子定时标准。除了我们的FRB观测值外,我们还分析了来自脉冲星B0329 + 54和B0355 + 54的明亮单个脉冲,以表征系统定位误差。我们的结果证明了CHIME / FRB支腿的关键软件,触发和校准挑战的成功实施:圆柱形VLBI支腿望远镜,与CHIME望远镜一起,将以足够的精度定位成千上万个FRB事件,以明确地将宿主星系与每次爆发。