旋转射电瞬变J1918 $-$ 0449的发现，具有500米口径球形radio telescope的有趣发射特性
The discovery of a rotating radio transient J1918$-$0449 with intriguing emission properties with the five hundred meter aperture spherical radio telescope
摘要：
在这项研究中，我们报告了一个详细的单脉冲分析的无线电发射从旋转无线电瞬变（RRAT）J1918 $-$ 0449，这是第一个RRAT发现的500米口径球面射电望远镜（FAST）。于2021年4月30日使用中心频率为1250 MHz，短时分辨率为49. 152 $μ$ s的FAST进行了敏感观测，这为详细探测单脉冲发射特性提供了可靠的基础。连续观察源约2小时。在1.8小时内共检测到83个显著性高于6 $σ$的分散爆发。源的DM和旋转周期分别被确定为116.1 $\pm$ 0.4 \pcm 1和2479.21 $\pm$ 0.03 ms。记录的脉冲占观测周期总数的3.12%。在平均的脉冲轮廓中没有检测到潜在的发射。对于通量大于10 μ ms的爆发，脉冲能量遵循指数为$-3.1\pm0.4$的幂律分布，表明存在亮脉冲发射。我们发现，随后的脉冲之间的时间分布是一致的一个平稳的泊松过程，并没有发现聚类的证据超过1.8小时的观察，给出一个平均突发率每66秒一个突发。仔细检查所检测到的明亮脉冲显示，21个脉冲表现出良好的准周期性。子脉冲漂移存在于具有$2.51\pm0.06$周期性的非连续旋转中。最后，讨论了可能的物理机制。
英文摘要：
In this study, we report on a detailed single pulse analysis of the radio emission from a rotating radio transient (RRAT) J1918$-$0449 which is the first RRAT discovered with the five hundred meter aperture spherical radio telescope (FAST). The sensitive observations were carried out on 30 April 2021 using the FAST with a central frequency of 1250 MHz and a short time resolution of 49.152 $μ$s, which forms a reliable basis to probe single pulse emission properties in detail. The source was successively observed for around 2 hours. A total of 83 dispersed bursts with significance above 6$σ$ are detected over 1.8 hours. The source's DM and rotational period are determined to be 116.1$\pm$0.4 \pcm \ and 2479.21$\pm$0.03 ms, respectively. The share of registered pulses from the total number of observed period is 3.12\%. No underlying emission is detected in the averaged off pulse profile. For bursts with fluence larger than 10 Jy ms, the pulse energy follows a power-law distribution with an index of $-3.1\pm0.4$, suggesting the existence of bright pulse emission. We find that the distribution of time between subsequent pulses is consistent with a stationary Poisson process and find no evidence of clustering over the 1.8 h observations, giving a mean burst rate of one burst every 66 s. Close inspection of the detected bright pulses reveals that 21 pulses exhibit well-defined quasi-periodicities. The subpulse drifting is present in non-successive rotations with periodicity of $2.51\pm0.06$ periods. Finally, possible physical mechanisms are discussed.
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