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arXiv 2010.09397astro-ph.HE
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长周期脉冲星非脉冲辐射的研究

Search for Off-pulse emission in Long Period Pulsars

Rahul Basu, Dipanjan Mitra, George I. Melikidze

摘要:

我们已经重新讨论了脉冲外辐射的问题,在脉冲窗口外进行了详细的搜索,寻找低水平的无线电发射的存在。先前使用巨米波射电望远镜(Giant Meterwave Radio Telescope,GMRT)在两个长周期射电望远镜PSR B 0525 +21和B2046-16中报道了频率低于1 GHz的非脉冲发射。然而,随后的研究没有检测到这些恒星在更高的射频(> 1 GHz)下的非脉冲发射。我们仔细检查了早期检测中使用的分析方案,发现使用的数据编辑程序异常,导致信号从打开脉冲泄漏到关闭脉冲区域。我们表明,PSR B 0525 +21和B2046-16的早期检测是这种泄漏的结果。对上述分析方案作了改进,并采用离线选通法,在不同的GMRT观测频率下,对21个长周期(P > 1.2秒)的射电天体进行了离脉冲辐射的搜索。在该列表PSR 0 B 0628 -28中最亮的脉冲星中检测到峰值通量为0.5 mJy的低水平关断脉冲发射的存在,关断脉冲与平均脉冲星通量之比为0.25%。我们认为光柱附近回旋共振产生的相干射电辐射可能是该脉冲星非脉冲辐射的一个来源。

英文摘要:

We have revisited the problem of off-pulse emission in pulsars, where detailed search for the presence of low level radio emission outside the pulse window is carried out. The presence of off-pulse emission was earlier reported in two long period pulsars, PSR B0525+21 and B2046-16 at frequencies below 1 GHz using the Giant Meterwave Radio Telescope (GMRT). However, subsequent studies did not detect off-pulse emission from these pulsars at higher radio frequencies (> 1 GHz). We have carefully inspected the analysis scheme used in the earlier detections and found an anomaly with data editing routines used, which resulted in leakage of signal from the on-pulse to the off-pulse region. We show that the earlier detections from PSR B0525+21 and B2046-16 were a result of this leakage. The above analysis scheme has been modified and offline-gating has been used to search for off-pulse emission in 21 long period pulsars (P > 1.2 sec) at different observing frequencies of GMRT. The presence of low level off-pulse emission of peak flux 0.5 mJy was detected in the brightest pulsar in this list PSR 0B0628-28, with off-pulse to average pulsar flux ratio of 0.25%. We suggest that coherent radio emission resulting due to cyclotron resonance near the light cylinder can be a possible source for the off-pulse emission in this pulsar.

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