论文标题
使用稀疏建模
Super-resolution Imaging of the Protoplanetary Disk HD 142527 Using Sparse Modeling
论文作者
论文摘要
即使在超分辨率制度中，重点也要改善忠诚度，在过去的几年中，新的成像技术已经得到了强烈的发展，这可能会为原动性磁盘的干涉观察带来重大改进。在这项研究中，首次将稀疏建模（SPM）应用于Atacama大毫米/亚毫米阵列（ALMA）进行的观察数据集。这项研究中使用的两个数据集使用Band 7（330 GHz）处的不同阵列配置独立拍摄，靶向HD 142527附近的原星磁盘；一个在较短的基线阵列配置（〜430 m）中，另一个在较长的基线阵列配置（〜1570 m）中。从两个数据集重建的图像分辨率差异约为3。我们确认以前已知的磁盘结构出现在SPM和Clean以标准梁大小的图像上出现在图像上。使用Clean使用更长的基线数据获得的SPM匹配从较短的基线数据重建的图像，从而获得了超分辨率图像，从中可以再现比光束尺寸的结构更细的结构。我们的结果表明，SPM成像技术中持续的密集开发对与Alma的成像有益。
With an emphasis on improving the fidelity even in super-resolution regimes, new imaging techniques have been intensively developed over the last several years, which may provide substantial improvements to the interferometric observation of protoplanetary disks. In this study, sparse modeling (SpM) is applied for the first time to observational data sets taken by the Atacama Large Millimeter/submillimeter Array (ALMA). The two data sets used in this study were taken independently using different array configurations at Band 7 (330 GHz), targeting the protoplanetary disk around HD 142527; one in the shorter-baseline array configuration (~ 430 m), and the other in the longer-baseline array configuration (~ 1570 m). The image resolutions reconstructed from the two data sets are different by a factor of ~ 3. We confirm that the previously known disk structures appear on the images produced by both SpM and CLEAN at the standard beam size. The image reconstructed from the shorter-baseline data using the SpM matches that obtained with the longer-baseline data using CLEAN, achieving a super-resolution image from which a structure finer than the beam size can be reproduced. Our results demonstrate that on-going intensive development in the SpM imaging technique is beneficial to imaging with ALMA.
