论文标题
在长时间的脉冲星中搜索脉冲外排放
Search for Off-pulse emission in Long Period Pulsars
论文作者
论文摘要
我们已经重新审视了脉冲星前脉冲发射的问题，在该问题中，详细搜索了脉冲窗口外的低水平无线电发射的存在。使用巨型MeterWave射程望远镜（GMRT），较早的两个长期脉冲显示，PSR B0525+21+21和B2046-16的存在较早地报道了PSR B0525+21和B2046-16的存在。但是，随后的研究未在较高的无线电频率（> 1 GHz）下检测到这些脉冲星的外部脉冲发射。我们已经仔细检查了早期检测中使用的分析方案，并发现了使用数据编辑例程的异常，从而导致信号从脉冲泄漏到脉冲外区域。我们表明，来自PSR B0525+21和B2046-16的较早检测是此泄漏的结果。上述分析方案已修改，并已使用越线门进行搜索在GMRT的不同观察频率下21个长期脉冲星（p> 1.2秒）中的脉冲发射。在此列表中，在最明亮的脉冲星PSR 0B0628-28中检测到峰值通量0.5 MJY的低水平外发射的存在，其外脉冲与平均脉冲星磁力比为0.25％。我们建议，由于在轻缸附近的回旋共振而导致的相干无线电发射可能是该脉冲星外脉冲发射的可能来源。
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.
