A STUDY OF GIANT PULSES FROM PSR J1824−2452A
A STUDY OF GIANT PULSES FROM PSR J1824−2452A
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DOI：
10.1086/508253
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
H. S. Knight;M. Bailes
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文献类型：
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作者：
H. S. Knight;M. Bailes
我们用Parkes射电望远镜寻找了球状星团M28中毫秒双星的微秒级爆发。我们总共探测到来自已知发射体PSR J1824− 2452 A的27个巨脉冲。在波长约20 cm处，巨脉冲被散射展宽到约2μs的宽度，并遵循幂律统计。脉冲发生在两个狭窄的相位窗口，与X射线发射的相位相关，并跟踪积分无线电脉冲分量的峰值。值得注意的是，在这些相位窗口的综合无线电发射具有比其他发射更陡的谱指数。这些巨大的脉冲呈现出高度的偏振，其中许多是100%的椭圆偏振。它们的位置角度是随机的。虽然PSR J1824− 2452 A的积分发射相对于所观察到的频率和带宽来说是相对稳定的，但单个巨脉冲的强度在我们的波段上变化很大。在2700和3500 MHz处检测到两个脉冲。在3500 MHz时，两个脉冲中较窄的一个脉冲宽度为20 ns。在2700 MHz处，该脉冲具有最大5×10 K的推断亮度温度。我们的观测表明PSR J1824− 2452 A的巨脉冲是在磁层的同一部分产生的，与X射线发射通过与普通脉冲不同的发射过程。主题标题：一般-个别（PSR B1821−24，PSR J1824−2452，PSR J1824− 2452 A）
We have searched for microsecond bursts of emission from millisecond pulsars in the globular cluster M28 using the Parkes radio telescope. We detected a total of 27 giant pulses from the known emitter PSR J1824−2452A. At wavelengths around 20 cm the giant pulses are scatter-broadened to widths of around 2μs and follow power-law statistics. The pulses occur in two narrow phasewindows which correlate in phase with X-ray emission and trail the peaks of the integrated radio pulse-components. Notably, the integrated radio emission at these phase windows has a steeper spectral index than other emission. The giant pulses exhibit a high degree of polarization, with many being 100% elliptically polarized. Their position angles appear random. Although the integrated emission of PSR J1824−2452A is relatively stable for the frequencies and bandwidths observed, the intensities of individual giant pulses vary considerably across our bands. Two pulses were detected at both 2700 and 3500MHz. The narrower of the two pulses is 20ns wide at 3500MHz. At 2700MHz this pulse has an inferred brightness temperature at maximum of 5×10 K. Our observations suggest the giant pulses of PSR J1824−2452A are generated in the same part of the magnetosphere as X-ray emission through a different emission process to that of ordinary pulses. Subject headings: pulsars:general — pulsars:individual (PSR B1821−24, PSR J1824−2452, PSR J1824−2452A)