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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Multifrequency Study of Giant Radio Pulses fromthe Crab Pulsar with the K5 VLBI Recording Terminal
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Multifrequency Study of Giant Radio Pulses fromthe Crab Pulsar with the K5 VLBI Recording Terminal

机译：利用K5 VLBI记录终端对蟹状脉冲星发出的巨大无线电脉冲进行多频研究

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摘要

Simultaneous multifrequency observations of Crab pulsar giant pulses (GPs) were performed with the 64-mKalyazin radio telescope at four frequency (v = 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 frequencybands. Several thousand GPs were detected during about 6 hours of observations on two successive days in 2005July. The radio spectra of single GPs were analyzed at separate frequencies and over the whole frequency range.These spectra manifest notable modulation over the frequency ranges, Δv, both on large (Δv/ v≈0.5) and small(Δv/ v ≈ 0.01) frequency scales. A cross-correlation analysis of GPs at 2.2 GHz showed that their pulse shapescan be interpreted as being an ensemble of unresolved bursts grouped together on time scales of≈1 μs, being well-correlated over a 60-MHz band. The corresponding GP cross-correlation functions do not obey the predictions of theamplitude-modulated noise model of Rickett (1975), thus indicating that unresolved components represent a smallnumber of elementary emitters.
机译：使用K5 VLBI记录终端，以64-mKalyazin射电望远镜在四个频率（v = 0.6、1.4、2.2和8.3 GHz）上对蟹状脉冲星超大脉冲（GPs）进行多频同步观测。 16个4 MHz宽频信道分布在4个频带上。在2005年7月的连续两天中，大约6个小时的观测期间检测到数千个GP。在单独的频率和整个频率范围内对单个GP的无线电频谱进行了分析，这些频谱在大（Δv/v≈0.5）和小（Δv/ v≈0.01）频率范围内表现出明显的调制频率秤。对GP在2.2 GHz处的互相关分析表明，它们的脉冲形状可以解释为是未分解的脉冲串的集合，在大约1μs的时间尺度上分组在一起，在60 MHz频段上具有良好的相关性。相应的GP互相关函数不服从Rickett（1975）的调幅噪声模型的预测，因此表明未解析的分量代表少量的基本发射器。

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