论文标题
PSR B2000+40的单脉冲发射中的子孔漂移和周期性无效
Subpulse Drifting and Periodic Nulling in single pulse emission of PSR B2000+40
论文作者
论文摘要
我们已经对Pulsar B2000+40（J2002+4050）的单个脉冲发射进行了详细研究，使用Effelsberg射电望远镜以1.6 GHz频率观察到。脉冲星的三个组件分离得不很好，中央组件类似于核心发射。我们使用波动频谱分析研究了单个脉冲行为的调制，该频谱分析表明存在两个突出的周期性，分别约为2.5 $ p $和40 $ p $。较短的周期性与子粘液漂移的现象有关，并且在中心核心成分中被认为不存在。漂移显示圆锥成分的较大相变。此外，周期性调制随时间的变化具有显着的演变，在非常清晰和高度分散的特征之间变化。除了漂移脉冲星外，在单个脉冲序列中还存在无效。波动光谱中较长的周期性特征与无效行为有关。 Pulsar加入了一个选择组，该组显示了相位调制的漂移的存在以及在存在核心发射的情况下的周期性空白。这提供了进一步的证据，即两种现象以不同的物理起源彼此不同。
We have carried out a detailed study of single pulse emission from the pulsar B2000+40 (J2002+4050), observed at 1.6 GHz frequencies using the Effelsberg radio telescope. The pulsar has three components which are not well separated, with the central component resembling core emission. We have investigated modulations in single pulse behaviour using the fluctuation spectral analysis which showed presence of two prominent periodicities, around 2.5$P$ and 40$P$, respectively. The shorter periodicity was associated with the phenomenon of subpulse drifting and was seen to be absent in central core component. Drifting showed large phase variations in conal components. Additionally, the periodic modulations had significant evolution with time, varying between very sharp and highly diffuse features. In addition to drifting the pulsar also had presence of nulling in the single pulse sequence. The longer periodic feature in the fluctuation spectra was associated with nulling behaviour. The pulsar joins a select group which shows the presence of phase modulated drifting as well as periodic nulling in the presence of core emission. This provides further evidence for the two phenomena to be distinct from each other with different physical origin.
