A VLBI Calibrator Grid at 600MHz for Fast Radio Transient Localizations with CHIME/FRB Outriggers

arXiv - PHYS - Instrumentation and Methods for Astrophysics Pub Date : 2024-09-17 DOI:arxiv-2409.11476

Shion Andrew, Calvin Leung, Alexander Li, Kiyoshi W. Masui, Bridget C. Andersen, Kevin Bandura, Alice P. Curtin, Jane Kaczmarek, Adam E. Lanman, Mattias Lazda, Juan Mena-Parra, Daniele Michilli, Kenzie Nimmo, Aaron B. Pearlman, Mubdi Rahman, Vishwangi Shah, Kaitlyn Shin, Haochen Wang

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引用次数: 0

Abstract

The Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) Project has a new VLBI Outrigger at the Green Bank Observatory (GBO), which forms a 3300km baseline with CHIME operating at 400-800MHz. Using 100ms long full-array baseband "snapshots" collected commensally during FRB and pulsar triggers, we perform a shallow, wide-area VLBI survey covering a significant fraction of the Northern sky targeted at the positions of compact sources from the Radio Fundamental Catalog. In addition, our survey contains calibrators detected from two 1s long trial baseband snapshots for a deeper survey with CHIME and GBO. In this paper, we present the largest catalog of compact calibrators suitable for 30-milliarcsecond-scale VLBI observations at sub-GHz frequencies to date. Our catalog consists of 200 total calibrators in the Northern Hemisphere that are compact on 30-milliarcsecond scales with fluxes above 100mJy. This calibrator grid will enable the precise localization of hundreds of FRBs a year with CHIME/FRB-Outriggers.

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利用 CHIME/FRB 外触发器进行快速无线电瞬变定位的 600MHz VLBI 校准器网格

加拿大氢强度绘图实验快速射电暴（CHIME/FRB）项目在绿岸天文台（GBO）新建了一个 VLBI 外触发器，它与 CHIME 形成了一条 3300 公里的基线，工作频率为 400-800MHz。我们利用在 FRB 和脉冲星触发时收集到的 100 毫秒长的全阵列基带 "快照"，进行了一次浅层、广域 VLBI 勘测，以射电基本星表中的紧凑源位置为目标，覆盖了北部天空的很大一部分。此外，我们的巡天还包含了从两个 1 秒长的试验基带快照中探测到的校准器，用于 CHIME 和 GBO 的深度巡天。在本文中，我们展示了迄今为止最大的、适用于 30 毫微秒尺度 VLBI 次 GHz 频率观测的紧凑型校准器星表。我们的星表包括北半球总共 200 个 30 毫微阿秒尺度的紧凑型定标器，它们的流量都在 100mJy 以上。这个校准器网格将使 CHIME/FRB-Outriggers 每年能够对数百个 FRB 进行精确定位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Instrumentation and Methods for Astrophysics

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