论文标题
GMRT高分辨率南部天空调查脉冲星和瞬变$ - $ IV：通过FFA搜索发现4个新的脉冲星调查
The GMRT High Resolution Southern Sky Survey for pulsars and transients $-$ IV: Discovery of 4 new pulsars with an FFA search
论文作者
论文摘要
基于快速的傅立叶变换（FFT）的周期性搜索方法为搜索毫秒和二进制脉冲星提供了一种有效的方法，但是在搜索长期和短期占空比脉冲星时会遇到明显的敏感性降解。一种基于FFT的搜索方法的替代方法称为快速折叠算法（FFA）搜索，为搜索具有长时间和短期周期的信号提供了较高的敏感性。在GMRT高分辨率Southern Sky（GHRSS）调查中，我们正在使用基于FFA的管道在100 ms至100 s的周期范围内寻找孤立的脉冲星。我们已经处理了2800度$^2 $的天空覆盖范围，并发现了6个新的脉冲星。在这里，我们通过FFA搜索管道报告了其中4个脉冲星的发现。这包括一个狭窄的占空比PULSAR，J1936 $ -30，显示出无效的行为，极端无效的分数为$ \ sim 90 \％$。 FFA搜索中的两个GHRS发现在狭窄的占空比范围内超出了现有人群的极限。在GHRSS调查和其他PULSAR调查中，FFA搜索的实施预计将恢复长期缺失的人口和短期贵族脉冲星的人数。
The fast Fourier transform (FFT) based periodicity search methods provide an efficient way to search for millisecond and binary pulsars but encounter significant sensitivity degradation while searching for long period and short duty cycle pulsars. An alternative to FFT-based search methods called the Fast Folding Algorithm (FFA) search, provides superior sensitivity to search for signals with long periods and short duty cycles. In the GMRT High Resolution Southern Sky (GHRSS) survey, we are using an FFA-based pipeline to search for isolated pulsars in a period range of 100 ms to 100 s. We have processed 2800 degree$^2$ of the sky coverage away from the Galactic plane and discovered 6 new pulsars. Here, we report the discovery of 4 of these pulsars with the FFA search pipeline. This includes a narrow duty cycle pulsar, J1936$-$30, which shows nulling behavior with an extreme nulling fraction of $\sim 90\%$. Two of the GHRSS discoveries from the FFA search lie in narrow duty cycle ranges beyond the limit of the existing population. The implementation of FFA search in the GHRSS survey and other pulsar surveys is expected to recover the missing population of long period and short duty cycle pulsars.
