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arXiv 2406.04581astro-ph.HE
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在Parkes对X射线脉冲星PSR J0537$-$6910的一次观测中探测到49个弱色散射电脉冲

Detection of 49 Weak Dispersed Radio Pulses in a Parkes Observation of the X-ray Pulsar PSR J0537$-$6910

Fronefield Crawford

AI总结:

本文在Parkes对PSR J0537$-$6910的11.6小时观测中,利用HEIMDALL和FETCH探测到49个弱色散射电脉冲,并发现其DM分布与LMC脉冲星一致,但无法确认其是否源自该X射线脉冲星。

摘要:

我对大麦哲伦云中的X射线脉冲星PSR J0537$-$6910进行了一次新的色散射电脉冲搜寻,使用了一段长时间(11.6小时)的1.4 GHz Parkes档案搜寻观测数据。我搜寻了色散量(DM)在0至10000 pc cm$^{-3}$之间的范围,并使用HEIMDALL和FETCH脉冲探测与分类软件包,在很宽的DM范围内探测到49个信噪比(S/N)大于7的脉冲。所有这些脉冲都很弱,没有一个脉冲的S/N超过8.5。在已知LMC脉冲星星族的DM范围内观测到显著的脉冲过量,表明这些脉冲可能源自LMC脉冲星。在单个DM试验值103.412 pc cm$^{-3}$(处于LMC的DM范围内)中探测到三个重复脉冲,每个脉冲的宽度$\lesssim 1$ ms。在这次搜寻的单个DM试验中,这种情况偶然发生的概率很低,显著性为(边缘显著的)4.3$σ$水平。目前仍不清楚样本中探测到的任何脉冲是否来自PSR J0537$-$6910本身。

英文摘要:

I conducted a new search for dispersed radio pulses from the X-ray pulsar PSR J0537$-$6910 in the Large Magellanic Cloud in a long (11.6 hr) archival 1.4 GHz Parkes search observation. I searched dispersion measures (DMs) between 0 and 10000 pc cm$^{-3}$ and detected 49 pulses with a signal-to-noise ratio (S/N) greater than 7 at a wide range of DMs using the HEIMDALL and FETCH pulse detection and classification packages. All of the pulses were weak, with none having a S/N above 8.5. There was a significant excess of pulses observed in the DM range of the known pulsar population in the LMC, suggesting that these pulses may originate from LMC pulsars. Three repeat pulses, each having widths $\lesssim 1$ ms, were detected in a single DM trial of 103.412 pc cm$^{-3}$, which is in the LMC DM range. This is unlikely to occur by chance in a single DM trial in this search at the (marginally significant) 4.3$σ$ level. It remains unclear whether any of the detected pulses in the sample are from PSR J0537$-$6910 itself.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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