Super-Resolved Image of M87 Observed with East Asian VLBI Network
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galaxies-11-00039.pdf
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Author(s)
Tazaki, Fumie
Cui, Yuzhu
Hada, Kazuhiro
Kino, Motoki
Cho, Ilje
Zhao, Guang-Yao
Akiyama, Kazunori
Mizuno, Yosuke
Ro, Hyunwook
Honma, Mareki
Date Issued
February 28, 2023
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Galaxies 11 (2): 39 (2023)
Version
Final published version
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.
MIT Department
Haystack Observatory
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DOI of Published Version
https://doi.org/10.3390/galaxies11020039
