Image plane detection of FRB121102 with the MeerKAT radio telescope
Image plane detection of FRB121102 with the MeerKAT radio telescope
复制标题
使用MeerKAT射电望远镜对FRB121102进行像面探测
DOI：
10.1093/mnras/stac3348
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发表时间：
2023
影响因子：
4.8
通讯作者：
Andrianjafy J
中科院分区：
文献类型：
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作者：
Andrianjafy J
我们对2019年9月MeerKAT观测到的重复快速射电暴FRB121102的2-s射电干涉图像进行了分析，在此期间，之前使用高时间和频率分辨率数据立方体检测到11个不同的脉冲。在这项工作中，我们在1.48 GHz的图像平面上检测到11个突发中的6个，最小峰值信噪比（S/N）为5σ，检测限为0.512 Jy ms。这是首次使用meerkatdata使用2秒时间尺度图像检测到快速无线电突发（FRB）或无线电瞬变。对拟合的爆发特性的分析表明，在爆发的定位中，加权平均精度为~ 1弧秒。准确了解快速射电暴的位置对于识别它们的宿主星系和理解它们至今仍未解决的神秘性质至关重要。我们也产生了1.09 GHz的2秒图像，但没有检测到我们归因于脉冲的光谱结构，这些脉冲在高频率的强度大多更高。我们还探索了一种新的差分图像分析（DIA）方法来搜索瞬态，并发现我们的技术有可能减少候选者的数量，并可用于在未来MeerKAT观测的图像平面上自动检测快速射电暴。
We present the analysis of radio interferometric 2-s images from a MeerKAT observation of the repeating fast radio burst FRB121102 in 2019 September, during which 11 distinct pulses have been previously detected using high time and frequency resolution data cubes. In this work, we detected 6 out of the 11 bursts in the image plane at 1.48 GHz with a minimum peak signal-to-noise ratio (S/N) of 5σ and a fluence detection limit of ∼0.512 Jy ms. These constitute the first detections of a fast radio burst (FRB) or a radio transient using 2-s time-scale images withMeerKATdata. Analysis of the fitted burst properties revealed a weighted average precision of ∼1 arcsec in the localization of the bursts. The accurate knowledge of FRB positions is essential for identifying their host galaxy and understanding their mysterious nature that is still unresolved to this day. We also produced 2-s images at 1.09 GHz but yielded no detection that we attributed to the spectral structure of the pulses that are mostly higher in strength in the upper frequencies. We also explore a new approach to difference image analysis (DIA) to search for transients and find that our technique has the potential to reduce the number of candidates and could be used to automate the detection of FRBs in the image plane for future MeerKAT observations.