论文标题
高分辨率VLBI脉冲星闪烁屏幕带有$θ-θ$变换
High Resolution VLBI Astrometry of pulsar scintillation screens with the $θ-θ$ Transform
论文作者
论文摘要
PULSAR闪烁体中$θ\Mhyphenθ$技术的最新开发为散射介质的新高分辨率成像技术打开了大门。通过解决相位检索问题并从脉冲星动态频谱中恢复波场，可以确定多普勒移位，时间延迟和各个图像的相位偏移。但是，从单盘中检索的结果结果仅是恒定相位旋转的，它在使用非常长的基线干涉仪进行天文测量时引入了额外的参数。我们使用多个站点之间的干涉可见性来校准波场。当应用于PSR B0834+06的现有数据时，我们测量的有效屏幕距离和镜头方向的精度是以前的工作的五倍。
The recent development of $θ\mhyphenθ$ techniques in pulsar scintillometry has opened the door for new high resolution imaging techniques of the scattering medium. By solving the phase retrieval problem and recovering the wavefield from a pulsar dynamic spectrum, the Doppler shift, time delay, and phase offset of individual images can be determined. However, the results of phase retrieval from a single dish are only known up to a constant phase rotation, which introduces extra parameters when doing astrometry using Very Long Baseline Interferometry. We present an extension to previous $θ\mhyphenθ$ methods using the interferometric visibilities between multiple stations to calibrate the wavefields. When applied to existing data for PSR B0834+06 we measure the effective screen distance and lens orientation with five times greater precision than previous works.
