Electric field representation of pulsar intensity spectra
Electric field representation of pulsar intensity spectra
复制标题
脉冲星强度谱的电场表示
DOI：
10.1111/j.1365-2966.2005.09396.x
复制
发表时间：
2005
影响因子：
4.8
通讯作者：
Mark Walker Dan Stinebring
中科院分区：
文献类型：
--
作者：
Mark Walker Dan Stinebring
脉冲星动态频谱显示了由于散射无线电波之间的干扰而产生的高能见度条纹。这些条纹可以是随机的，也可以是高度有序的图案，这取决于散射或折射的性质。在这里，我们考虑将脉冲星动态光谱--即强度测量--分解为其组成的散射波，即电场分量的可能性。我们描述了一种实现这种分解的迭代方法，并展示了该算法如何在脉冲星B0834+06的数据上执行。模型和观测值之间的匹配性很好，尽管作为数据的表示形式不能被正式接受。以这种方式导出的散射波分量对于定性地洞察散射几何结构立即有用。随着进一步的发展，这种方法可以被用于各种用途，包括：成像星际介质中的散射和折射结构；以非常高的角分辨率对脉冲星进行星际干涉成像，以及缓解由于星际散射引起的脉冲到达时间波动。
Pulsar dynamic spectra exhibit high-visibility fringes arising from interference between scattered radiowaves. These fringes may be random or of highly ordered patterns, depending on the nature of the scattering or refraction. Here we consider the possibility of decomposing pulsar dynamic spectra-which are intensity measurements-into their constituent scattered waves, i.e. electric field components. We describe an iterative method of achieving this decomposition and show how the algorithm performs on data from the pulsar B0834+06. The match between model and observations is good, although not formally acceptable as a representation of the data. Scattered wave components derived in this way are immediately useful for qualitative insights into the scattering geometry. With some further development, this approach can be put to a variety of uses, including: imaging the scattering and refracting structures in the interstellar medium; interstellar interferometric imaging of pulsars at a very high angular resolution and mitigating pulse arrival time fluctuations due to interstellar scattering.