Super-Resolved Image of M87 Observed with East Asian VLBI Network
Abstract
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.
Keywords
Cite
@article{arxiv.2303.01048,
title = {Super-Resolved Image of M87 Observed with East Asian VLBI Network},
author = {Fumie Tazaki and Yuzhu Cui and Kazuhiro Hada and Motoki Kino and Ilje Cho and Guang-Yao Zhao and Kazunori Akiyama and Yosuke Mizuno and Hyunwook Ro and Mareki Honma and Ru-Sen Lu and Zhi-Qiang Shen and Lang Cui and Yoshinori Yonekura},
journal= {arXiv preprint arXiv:2303.01048},
year = {2023}
}
Comments
9 pages, 5 figures, published in Galaxies