Super-Resolved Image of M87 Observed with East Asian VLBI Network
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...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
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Multidisciplinary Digital Publishing Institute
2023
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| Online Access: | https://hdl.handle.net/1721.1/148469 |
| _version_ | 1811086685401776128 |
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| author | Tazaki, Fumie Cui, Yuzhu Hada, Kazuhiro Kino, Motoki Cho, Ilje Zhao, Guang-Yao Akiyama, Kazunori Mizuno, Yosuke Ro, Hyunwook Honma, Mareki Lu, Ru-Sen Shen, Zhi-Qiang Cui, Lang Yonekura, Yoshinori |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Tazaki, Fumie Cui, Yuzhu Hada, Kazuhiro Kino, Motoki Cho, Ilje Zhao, Guang-Yao Akiyama, Kazunori Mizuno, Yosuke Ro, Hyunwook Honma, Mareki Lu, Ru-Sen Shen, Zhi-Qiang Cui, Lang Yonekura, Yoshinori |
| author_sort | Tazaki, Fumie |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T13:30:08Z |
| format | Article |
| id | mit-1721.1/148469 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:30:08Z |
| publishDate | 2023 |
| publisher | Multidisciplinary Digital Publishing Institute |
| record_format | dspace |
| spelling | mit-1721.1/1484692024-01-11T20:34:55Z Super-Resolved Image of M87 Observed with East Asian VLBI Network Tazaki, Fumie Cui, Yuzhu Hada, Kazuhiro Kino, Motoki Cho, Ilje Zhao, Guang-Yao Akiyama, Kazunori Mizuno, Yosuke Ro, Hyunwook Honma, Mareki Lu, Ru-Sen Shen, Zhi-Qiang Cui, Lang Yonekura, Yoshinori Haystack Observatory 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. 2023-03-10T18:20:38Z 2023-03-10T18:20:38Z 2023-02-28 2023-03-10T14:01:52Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148469 Galaxies 11 (2): 39 (2023) PUBLISHER_CC http://dx.doi.org/10.3390/galaxies11020039 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ application/pdf Multidisciplinary Digital Publishing Institute Multidisciplinary Digital Publishing Institute |
| spellingShingle | Tazaki, Fumie Cui, Yuzhu Hada, Kazuhiro Kino, Motoki Cho, Ilje Zhao, Guang-Yao Akiyama, Kazunori Mizuno, Yosuke Ro, Hyunwook Honma, Mareki Lu, Ru-Sen Shen, Zhi-Qiang Cui, Lang Yonekura, Yoshinori Super-Resolved Image of M87 Observed with East Asian VLBI Network |
| title | Super-Resolved Image of M87 Observed with East Asian VLBI Network |
| title_full | Super-Resolved Image of M87 Observed with East Asian VLBI Network |
| title_fullStr | Super-Resolved Image of M87 Observed with East Asian VLBI Network |
| title_full_unstemmed | Super-Resolved Image of M87 Observed with East Asian VLBI Network |
| title_short | Super-Resolved Image of M87 Observed with East Asian VLBI Network |
| title_sort | super resolved image of m87 observed with east asian vlbi network |
| url | https://hdl.handle.net/1721.1/148469 |
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