Investigation of states switch properties of PSR J1946 + 1805 with the FAST

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astrophysics and Space Science Pub Date : 2024-02-20 DOI:10.1007/s10509-024-04284-9

Jie Tian, Xin Xu, Juntao Bai, Jiguang Lu, Lunhua Shang, Shi Dai, Dandan Zhang, Guojun Qiao, Rushang Zhao, Aijun Dong, Wenqian Zhong, Qijun Zhi, Shijun Dang

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Abstract

We have carried out a detailed study of the single pulse of PSR J1946 + 1805 with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). We reassessed the nulling fraction (NF) to be 57.5%. We also reverted the multiple drifting modes and obtained their drifting parameters. It is found that, for this pulsar, there exists the dwarf pulse at the beginning or end of the burst state, and the duration of dwarf pulse usually is one to two pulse periods. Additionally, we observed that there are scattered dwarf pulses detected in the null state. Detailed analysis of the fraction of linear polarization for all dwarf pulse is presented. It is worth noting that relative to normal pulses these dwarf pulses have a very high fraction of linear polarization, even more than 90%. We proposed that the dwarf pulses appearing at the beginning or end of the burst state may be a common behavior, which is important to understand the physical mechanism of the process of switching between two states.

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利用 FAST 研究 PSR J1946 + 1805 的状态切换特性

我们利用五百米口径球面射电望远镜（FAST）对 PSR J1946 + 1805 的单脉冲进行了详细研究。我们重新评估了无效分数（NF）为 57.5%。我们还还原了多重漂移模式，并获得了它们的漂移参数。我们发现，该脉冲星在爆发状态的开始或结束时存在矮脉冲，矮脉冲的持续时间通常为一到两个脉冲周期。此外，我们还观测到在空状态下检测到的散射矮脉冲。我们对所有矮脉冲的线性偏振比例进行了详细分析。值得注意的是，相对于正常脉冲，这些矮脉冲的线性偏振率非常高，甚至超过了 90%。我们提出，在爆发态开始或结束时出现的矮脉冲可能是一种常见行为，这对于理解两种状态之间切换过程的物理机制非常重要。

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来源期刊

Astrophysics and Space Science 地学天文-天文与天体物理

CiteScore

3.40

自引率

5.30%

发文量

106

审稿时长

2-4 weeks

期刊介绍： Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.