用K5 VLBI记录终端对蟹状星云脉冲星巨射电脉冲的多频研究
Multifrequency Study of Giant Radio Pulses from the Crab Pulsar with the K5 VLBI Recording Terminal
摘要：
利用64米口径Kalyazin射电望远镜的K5 VLBI记录终端在0.6、1.4、2.2和8.3 GHz四个频率上对蟹状星云脉冲星巨脉冲进行了同步多频观测。K5终端在分布于4个频带的16个4 MHz宽的频道中提供连续记录。2005年7月，在连续两天约6小时的观测中，发现了数千个GP。在不同的频率和整个频率范围内分析了单个GPS的无线电频谱。这些光谱在大（$Δν/ν\approx 0.5$）和小（$Δν/ν\approx 0.01$）频率尺度上在频率范围$Δν$上表现出显著的调制。在2.2 GHz的GPS的互相关分析表明，它们的脉冲形状可以被解释为一个整体的未解决的突发分组在一起的时间尺度上的$\approx 1$ MCS在60 MHz的频带上被很好地相关。相应的GP交叉关联函数不服从Rickett（1975）的调幅噪声模型的预测，因此表明未分辨的分量代表少量的基元发射体。
英文摘要：
Simultaneous multifrequency observations of the Crab pulsar giant pulses (GPs) were performed with the 64-m Kalyazin radio telescope at four frequencies 0.6, 1.4, 2.2 and 8.3 GHz using the K5 VLBI recording terminal. The K5 terminal provided continuous recording in 16 4-MHz wide frequency channels distributed over 4 frequency bands. Several thousands of GPs were detected during about 6 hours of observations in two successive days in July 2005. Radio spectra of single GPs were analysed at separate frequencies and over whole frequency range. These spectra manifest notable modulation over frequency ranges, $Δν$, both on large ($Δν/ν\approx 0.5$) and small ($Δν/ν\approx 0.01$) frequency scales. Cross-correlation analysis of GPs at 2.2 GHz showed that their pulse shapes can be interpreted as an ensemble of unresolved bursts grouped together at time scales of $\approx 1$ mcs being well-correlated over a 60-MHz band. The corresponding GP cross-correlation functions do not obey the predictions of the amplitude-modulated noise model of Rickett (1975), thus indicating that unresolved components represent a small number of elementary emitters.
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