小麦哲伦星系中最慢射电脉冲星的发现
Discovery of the Slowest Radio Pulsar in the Small Magellanic Cloud
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中文总结 AI 辅助
本研究通过重新分析Parkes/Murriyang存档观测数据，在小麦哲伦星系中发现了该星系已知最慢的射电脉冲星PSR J0103−72，该脉冲星此前被早期搜索遗漏，其剩余色散量暗示了特殊的电离介质环境。
中文摘要 AI 辅助
我们通过重新分析Parkes/Murriyang望远镜针对小麦哲伦星系（SMC）内超新星遗迹与脉冲星风星云的存档观测数据，报告了一颗新射电脉冲星PSR J0103−72的发现。此前这些观测中已发现两颗脉冲星，PSR J0103−72是我们在其目标天区的两次观测中独立探测到的第三颗脉冲星。它的自转周期为1.327秒，色散量（DM）为272±13 pc·cm⁻³，使其成为SMC中已知最慢的射电脉冲星，且拥有第二高的DM。我们未发现任何与该脉冲星相关的合理超新星遗迹或脉冲星风星云。扣除预测的银河前景贡献后，剩余的DM贡献约为230–242 pc·cm⁻³，这可能表明该脉冲星穿过SMC电离介质的路径较长，或视线方向上电离气体增强，或两者兼而有之。尽管这些数据此前已通过FFT和快速折叠算法进行过搜索，但我们基于FFT的重新处理，通过此前在其他巡天中高效发现大量脉冲星的搜索技术，找到了PSR J0103−72。这一发现表明，傅里叶域显著性较弱的候选体可揭示早期河外脉冲星搜索中遗漏的暗弱、窄占空比脉冲星。
英文摘要
We report the discovery of a new radio pulsar PSR J0103$-$72 in the Small Magellanic Cloud (SMC) through a reanalysis of Parkes/Murriyang archival observations targeting supernova remnants and pulsar-wind nebulae in the SMC. Previously two pulsars were discovered in these observations, and PSR J0103$-$72 is the third which we independently detected in two observations of its target field. It has a spin period of 1.327 sec and a dispersion measure (DM) of $272\pm13~\mathrm{pc\,cm^{-3}}$, making it the slowest known radio pulsar in the SMC with the second-highest DM. We did not identify any plausible supernova remnant or pulsar-wind nebula associated with the pulsar. Subtracting the predicted Galactic foreground leaves a DM contribution of $\sim 230$--$242~\mathrm{pc\,cm^{-3}}$, which may suggest a long path through the ionized medium of the SMC, enhanced ionized gas along the sightline, or both. Although these data had previously been searched using both FFT and fast folding algorithms, our FFT-based reprocessing found PSR J0103$-$72 through search techniques which have previously been highly effective in discovering a large number of pulsars in other surveys. This discovery shows that candidates with weak Fourier-domain significance can reveal faint, narrow-duty cycle pulsars missed in earlier extragalactic pulsar searches.
发表机构
- Trinity College, Univeristy of Cambridge（剑桥大学三一学院）
- Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理研究所（阿尔伯特·爱因斯坦研究所））
- Leibniz Universität Hannover（汉诺威莱布尼茨大学）
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