CRAFT HTR2：来自更新版CRAFT目录的64个非重复快速射电暴的偏振测量
CRAFT HTR2: Polarimetry of 64 non-repeating fast radio bursts from the updated CRAFT catalogue
- Swinburne University of Technology（斯威本科技大学）
- University of Edinburgh（爱丁堡大学）
- Curtin University（科廷大学）
- University of Cape Town（开普敦大学）
- ASTRON, Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究利用CRAFT/CRACO系统新增34个FRB偏振数据，使样本翻倍，发现河外RM分布与CHIME不同，但偏振分数无显著差异，且宽而暗弱的暴偏振分数更低。
AI中文摘要：
我们展示了2024年5月至2026年6月期间，由澳大利亚平方公里阵列探路者（ASKAP）上的共生实时快速瞬变（CRAFT）巡天发现的34个新的快速射电暴（FRB）的高时间分辨率光谱偏振数据。其中大多数是由在此期间在望远镜上调试的更高灵敏度的CRAFT相干（CRACO）探测系统探测到的。这个新样本使CRAFT HTR目录的规模翻倍，并由于CRACO灵敏度的提高，探测到了更暗弱的FRB群体。我们将河外旋转测量（RM）和偏振分数的分布与CHIME和DSA目录进行了比较。虽然CRAFT和DSA之间没有观察到显著差异，但在CHIME FRB（在较低频率下探测到的）中看到的河外RM分布明显较低。令人惊讶的是，我们发现三个FRB目录之间的线性偏振分数分布没有显著差异，这表明与不同望远镜的观测频率无关。我们展示了初步证据，表明更宽和更暗弱的暴具有较低的偏振分数；这主要是由不断增长的未偏振暴样本所驱动的，这些暴在几乎所有情况下都比ASKAP探测的中位数更宽（≫10毫秒）且更暗弱（≪10^34尔格秒^-1赫兹^-1）。
英文摘要：
We present high-time resolution spectro-polarimetric data for 34 new fast radio bursts (FRBs) discovered by the Commensal Real-time Fast Transients (CRAFT) survey on the Australian Square Kilometer Array Pathfinder (ASKAP) during the period May 2024 to June 2026. Most of these were detected by the higher-sensitivity CRAFT COherent (CRACO) detection system that was commissioned on the telescope during this period. This new sample doubles the size of the CRAFT HTR catalogue and probes a fainter population of FRBs thanks to the improved sensitivity of CRACO. We compare the distribution of extragalactic rotation measure (RM) and polarisation fraction to the CHIME and DSA catalogues. While no significant differences were seen between CRAFT and DSA, the extragalactic RM distribution seen in CHIME FRBs (which are detected at lower frequency) was substantially lower. Surprisingly, we find no significant differences in the linear polarisation fraction distribution between the three FRB catalogues, suggesting an indifference to the different telescope observing frequencies. We show tentative evidence for wider and fainter bursts possessing lower polarisation fractions; this is predominantly driven by the growing sample of unpolarised bursts that are, in almost all cases, wider ($\gg$10 ms) and fainter ($\ll$10$^{34}$ ergs s$^{-1}$ Hz$^{-1}$) than the median ASKAP detection.
