Ro, Hyunwook and Kino, Motoki and Sohn, Bong Won and Hada, Kazuhiro and Park, Jongho and Nakamura, Masanori and Cui, Yuzhu and Yi, Kunwoo and Chung, Aeree and Hodgson, Jeffrey and Kawashima, Tomohisa and An, Tao and Trippe, Sascha and Algaba Marcos, Juan-Carlos and Kim, Jae-Young and Sawada-Satoh, Satoko and Wajima, Kiyoaki and Shen, Zhiqiang and Cheng, Xiaopeng and Cho, Ilje and Jiang, Wu and Jung, Taehyun and Lee, Jee-Won and Niinuma, Kotaro and Oh, Junghwan and Tazaki, Fumie and Zhao, Guang-Yao and Akiyama, Kazunori and Honma, Mareki and Lee, Jeong Ae and Lu, Rusen and Zhang, Yingkang and Asada, Keiichi and Cui, Lang and Hagiwara, Yoshiaki and Hirota, Tomoya and Kawaguchi, Noriyuki and Koyama, Shoko and Lee, Sang-Sung and Oh, Se-Jin and Sugiyama, Koichiro and Takamura, Mieko and Wang, Xuezheng and Hwang, Ju-Yeon and Jung, Dong-Kyu and Kim, Hyo-Ryoung and Kim, Jeong-Sook and Kobayashi, Hideyuki and Oh, Chung-Sik and Oyama, Tomoaki and Roh, Duk-Gyoo and Yeom, Jae-Hwan (2023) Spectral analysis of a parsec-scale jet in M 87: Observational constraint on the magnetic field strengths in the jet. Astronomy & Astrophysics, 673. ISSN 0004-6361, DOI https://doi.org/10.1051/0004-6361/202142988.
Full text not available from this repository.Abstract
Context. Because of its proximity and the large size of its black hole, M 87 is one of the best targets for studying the launching mechanism of active galactic nucleus jets. Currently, magnetic fields are considered to be an essential factor in the launching and accelerating of the jet. However, current observational estimates of the magnetic field strength of the M 87 jet are limited to the innermost part of the jet (less than or similar to 100 r(s)) or to HST-1 (similar to 10(5) r(s)). No attempt has yet been made to measure the magnetic field strength in between. Aims. We aim to infer the magnetic field strength of the M 87 jet out to a distance of several thousand r(s) by tracking the distance-dependent changes in the synchrotron spectrum of the jet from high-resolution very long baseline interferometry observations. Methods. In order to obtain high-quality spectral index maps, quasi-simultaneous observations at 22 and 43 GHz were conducted using the KVN and VERA Array (KaVA) and the Very Long Baseline Array (VLBA). We compared the spectral index distributions obtained from the observations with a model and placed limits on the magnetic field strengths as a function of distance. Results. The overall spectral morphology is broadly consistent over the course of these observations. The observed synchrotron spectrum rapidly steepens from alpha(22 - 43 GHz) similar to -0.7 at similar to 2 mas to alpha(22 - 43 GHz) similar to -2.5 at similar to 6 mas. In the KaVA observations, the spectral index remains unchanged until similar to 10 mas, but this trend is unclear in the VLBA observations. A spectral index model in which nonthermal electron injections inside the jet decrease with distance can adequately reproduce the observed trend. This suggests the magnetic field strength of the jet at a distance of 2-10 mas (similar to 900 r(s) - similar to 4500 r(s) in the deprojected distance) has a range of B = (0.3-1.0 G)(z/2mas)(-0.73). Extrapolating to the Event Horizon Telescope scale yields consistent results, suggesting that the majority of the magnetic flux of the jet near the black hole is preserved out to similar to 4500 r(s) without significant dissipation.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | galaxies: active; galaxies: individual: M 87; galaxies: jets; radio continuum: galaxies; relativistic processes; techniques: interferometric |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 29 Jul 2025 01:03 |
| Last Modified: | 29 Jul 2025 01:03 |
| URI: | http://eprints.um.edu.my/id/eprint/50777 |
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