东亚VLBI网观测的M87超分辨率图像
Super-Resolved Image of M87 Observed with East Asian VLBI Network
摘要：
获得厘米或更长波长的高分辨率图像对于理解射流物理至关重要。利用东亚VLBI台网（EAVN）观测的M87 22 GHz数据，采用与常规成像方法CLEAN不同的正则化极大似然（RML）方法重建图像。因此，一个明亮的核心和喷流延伸约30质量的西北被检测到具有更高的分辨率比清洁图像。喷流的宽度在距离核心0.3质量处为0.5质量，与先前研究中在86 GHz图像中测量的宽度一致。此外，三个脊能够被检测到在约8质量的核心，即使峰-峰分离仅为1.0质量。这表明RML图像的空间分辨率比CLEAN图像的空间分辨率高至少30%。这项研究是一个重要的一步，为未来的多频率和高节奏的观测EAVN，以讨论更详细的结构，喷流及其时间变化。
英文摘要：
Obtaining high-resolution images at centimeter-or-longer wavelengths is vital for understanding the physics of jets. We reconstructed images from the M87 22 GHz data observed with the East Asian VLBI Network (EAVN) by using the regularized maximum likelihood (RML) method, which is different from the conventional imaging method CLEAN. Consequently, a bright core and jet extending about 30 mas to the northwest were detected with a higher resolution than in the CLEAN image. The width of the jet was 0.5 mas at 0.3 mas from the core, consistent with the width measured in the 86 GHz image in the previous study. In addition, three ridges were able to be detected at around 8 mas from the core, even though the peak-to-peak separation was only 1.0 mas. This indicates that the RML image's spatial resolution is at least 30% higher than that of the CLEAN image. This study is an important step for future multi-frequency and high-cadence observations of the EAVN to discuss the more detailed structure of the jet and its time variability.
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