GMRT高分辨率南天脉冲星与暂现源巡天——VI：脉冲星PSR J1244-4708的消零发现、定位与计时
The GMRT High Resolution Southern Sky Survey for pulsars and transients -- VI: Discovery of nulling, localisation and timing of PSR J1244-4708
AI总结：
本文报告GHRSS发现的脉冲星J1244-4708的定位与计时，揭示其消零比例约60%且具有准周期性，并证明FFA搜索对极端消零脉冲星更有效。
摘要：
已知脉冲星群体中许多脉冲星表现出消零现象，其特征是射电辐射突然停止并随后恢复。在这项工作中，我们给出了GHRSS发现的脉冲星J1244-4708的定位、计时和辐射性质。此外，我们发现这颗脉冲星表现出消零，消零比例接近60%。在这颗脉冲星的消零中还观察到准周期性，具有两个时间尺度。我们利用uGMRT在波段3（300-500 MHz）和波段4（550-750 MHz）的同步观测，证明了该脉冲星消零的宽带性质。我们还比较了各种搜索方法（如单脉冲搜索、基于快速折叠算法（FFA）的搜索和基于快速傅里叶变换（FFT）的搜索）在搜寻消零脉冲星方面的效率。我们证明FFA搜索在探测极端消零脉冲星方面具有优势，这一点也通过使用GMRT对消零脉冲星进行多个历元观测得到证实。
英文摘要：
Many pulsars in the known population exhibit nulling, which is characterised by a sudden cessation and subsequent restoration of radio emission. In this work, we present the localization, timing, and emission properties of a GHRSS discovered pulsar J1244-4708. Moreover, we find that this pulsar shows nulling with a nulling fraction close to 60%. A quasi-periodicity is also seen in the nulling from this pulsar with two timescales. We demonstrate the broadband nature of nulling in this pulsar using simultaneous observations in band-3 (300-500 MHz) and band-4 (550-750 MHz) with the uGMRT. We also present a comparison of the efficiency of various search approaches such as single pulse search, Fast Folding Algorithm (FFA) based search, and Fast Fourier Transform (FFT) based search to search for nulling pulsars. We demonstrated that the FFA search is advantageous for detecting extreme nulling pulsars, which is also confirmed with multiple epochs of observations for the nulling pulsars using the GMRT.
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