VLBI天体测量程序与CHIME/FRB Outriggers的性能
VLBI Astrometric Procedure and Performance with CHIME/FRB Outriggers
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中文总结 AI 辅助
本文介绍CHIME/FRB Outriggers低频大视场VLBI阵列定位FRB的分析程序，通过千余次测试证明其能稳健满足并有时超越约50毫角秒的标称天体测量精度，为未来大视场VLBI FRB巡天奠定基础。
中文摘要 AI 辅助
利用甚长基线干涉测量（VLBI）对快速射电暴（FRB）在其宿主星系内的具体环境进行精确定位，为理解其前身天体性质提供了宝贵见解。迄今为止，此类定位主要依赖传统VLBI设施，其观测能力仅限于对频率高于约1 GHz、可观测的少量重复FRB进行有针对性的后续观测。CHIME/FRB Outriggers是一个低频（400–800 MHz）大视场VLBI网络，旨在克服这些限制，目标是将CHIME探测到的相当一部分FRB定位到约50毫角秒的精度。本文详细介绍了使用CHIME/FRB Outriggers VLBI阵列定位FRB的分析程序。通过超过一千次由已知VLBI位置的连续谱校准源和脉冲星组成的测试定位，我们全面展示了该VLBI阵列能够稳健地满足，并在某些条件下超越CHIME/FRB Outriggers核心科学目标所需的标称天体测量规格。通过证明大视场巡天仪器能够对一次性FRB提供常规约50毫角秒的天体测量，这项工作为即将到来的一代大视场VLBI FRB巡天及其将实现的种群规模FRB样本奠定了基础。
英文摘要
Precise localizations of fast radio bursts (FRBs) to specific environments within their host galaxies with very-long-baseline interferometry (VLBI) have provided valuable insights into the nature of their progenitors. To date, such localizations have relied primarily on traditional VLBI facilities, whose observational capabilities limit them to targeted follow-up on a small subset of repeating FRBs that are observable at frequencies above $\sim$1 GHz. CHIME/FRB Outriggers is a low-frequency (400--800 MHz), wide-field VLBI network designed to overcome these limitations, aiming to localize a substantial fraction of CHIME-detected FRBs to $\sim$50 mas precision. In this work, we detail the analysis procedure used to localize FRBs with the CHIME/FRB Outriggers VLBI array. With over a thousand test localizations consisting of continuum calibrators and pulsars with known VLBI positions, we provide a comprehensive demonstration of the VLBI array's ability to robustly meet, and under some conditions exceed, the nominal astrometric specification required for the central science goals of CHIME/FRB Outriggers. By demonstrating that a wide-field survey instrument can deliver routine $\sim$50 mas astrometry on one-off FRBs, this work lays the foundation for the upcoming generation of wide-field VLBI FRB surveys and the population-scale FRB samples they will enable.
发表机构
- Massachusetts Institute of Technology（麻省理工学院）
- University of Toronto（多伦多大学）
- University of California Berkeley（加州大学伯克利分校）
- University of Amsterdam（阿姆斯特丹大学）
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