射电瞬变和脉冲星的束阵定位

M C Bezuidenhout, C J Clark, R P Breton, B W Stappers, E D Barr, M Caleb, W Chen, F Jankowski, M Kramer, K Rajwade, M Surnis
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引用次数: 2

摘要

MeerKAT等多元件干涉仪具有高时间分辨率和宽视场,为进行实时、非目标瞬态和脉冲星搜索提供了理想的机会。然而,由于数据存储的限制,存储对发现的瞬态或脉冲星场成像所需的基带数据并不总是可行的。这限制了巡天有效定位发现的能力,并可能限制后续科学研究的机会,尤其是像一些快速射电暴这样的一次性事件。在这里,我们提出了一种新的最大似然估计方法来定位在多个MeerKAT捆绑阵列波束中同时检测到的瞬态和脉冲星,我们称之为捆绑阵列波束定位,以及一种名为SeeKAT的Python实现方法。我们提供了SeeKAT使用的实际示例以及蒙特卡罗分析,以表明它能够将在波束形成的MeerKAT数据中检测到的单脉冲定位到(亚)弧秒精度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tied-array beam localization of radio transients and pulsars
Abstract Multi-element interferometers such as MeerKAT, which observe with high time resolution and have a wide field of view, provide an ideal opportunity to perform real-time, untargeted transient and pulsar searches. However, because of data storage limitations, it is not always feasible to store the baseband data required to image the field of a discovered transient or pulsar. This limits the ability of surveys to effectively localize their discoveries and may restrict opportunities for follow-up science, especially of one-off events like some fast radio bursts. Here, we present a novel maximum-likelihood estimation approach to localizing transients and pulsars detected in multiple MeerKAT tied-array beams at once, which we call tied-array beam localization, as well as a Python implementation of the method named SeeKAT. We provide real-world examples of SeeKAT’s use as well as a Monte Carlo analysis to show that it is capable of localizing single pulses detected in beamformed MeerKAT data to (sub)arcsec precision.
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