Spectral analysis of a parsec-scale jet in M 87: Observational constraint on the magnetic field strengths in the jet
文献类型：期刊论文
| 作者 | Ro, Hyunwook34,35; Kino, Motoki32,33; Sohn, Bong Won31,34,35; Hada, Kazuhiro29,30; Park, Jongho27,28,34; Nakamura, Masanori26,28; Cui, Yuzhu24,25; Yi, Kunwoo27; Chung, Aeree35; Hodgson, Jeffrey23 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2023-05-24 |
| 卷号 | 673页码:16 |
| ISSN号 | 0004-6361 |
| 关键词 | galaxies: active galaxies: individual: M 87 galaxies: jets radio continuum: galaxies relativistic processes techniques: interferometric |
| DOI | 10.1051/0004-6361/202142988 |
| 通讯作者 | Ro, Hyunwook(hwro@yonsei.ac.kr) |
| 英文摘要 | 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. |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; BLACK-HOLE MASS ; GAMMA-RAY FLARE ; M87 JET ; VLBI OBSERVATIONS ; SCHWARZSCHILD RADII ; CORE-SHIFT ; RELATIVISTIC JETS ; DYNAMICAL MODELS ; FREQUENCY VLBI |
| 资助项目 | Korea Astronomy and Space Science Institute ; National Astronomical Observatory of Japan ; Korea Astronomy and Space Science Institute under the RD program ; Ministry of Science ; KASI-Yonsei DRC program of the Korea Research Council of Fundamental Science and Technology ; National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) of Korea ; National Research Foundation of Korea (NRF) ; Korean National Research Foundation (NRF) via Global Ph.D. Fellowship ; EACOA Fellowship ; Academia Sinica Institute of Astronomy and Astrophysics ; East Asia Core Observatories Association ; National Astronomical Observatory of Japan ; Center for Astronomical Mega-Science ; Chinese Academy of Sciences ; Korea Astronomy and Space Science Institute ; Spanish Ministerio de Economia y Competitividad ; Mitsubishi Foundation ; JSPS/MEXT KAKENHI[DRC-12-2-KASI] ; JSPS KAKENHI[NRF-2020K1A3A1A78114060] ; National Research Foundation (NRF) of Korea[2022R1A2C100298211] ; National Research Foundation (NRF) of Korea[2022R1A6A1A03053472] ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education[2014H1A2A1018695] ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education[2015H1A2A1033752] ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education ; National Research Foundation of Korea (NRF) - Korea government (MIST) ; China Postdoctoral Science Foundation ; Key Program of the National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; Shanghai Pilot Program for Basic Research - Chinese Academy of Sciences, Shanghai Branch ; Max Planck Partner Group of the MPG and the CAS ; Major Program of the National Natural Science Foundation of China[PID2019-108995GB-C21] ; [201911019] ; [18K03656] ; [18H03721] ; [19H01943] ; [18KK0090] ; [21H01137] ; [21H04488] ; [21K03628] ; [2022R1F1A1075115] ; [2022R1C1C1005255] ; [NRF-2021R1A6A3A01086420] ; [2016R1A5A1013277] ; [2020R1A2C1007219] ; [2020R1A2C2009003] ; [2022M712084] ; [11933007] ; [ZDBS-LY-SLH011] ; [QYZDJ-SSWSLH057] ; [JCYJ-SHFY-2022-013] ; [11590780] ; [11590784] ; National Research Foundation of Korea[2022R1A6A1A03053472] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | EDP SCIENCES S A |
| WOS记录号 | WOS:001004184500003 |
| 资助机构 | Korea Astronomy and Space Science Institute ; National Astronomical Observatory of Japan ; Korea Astronomy and Space Science Institute under the RD program ; Ministry of Science ; KASI-Yonsei DRC program of the Korea Research Council of Fundamental Science and Technology ; National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) of Korea ; National Research Foundation of Korea (NRF) ; Korean National Research Foundation (NRF) via Global Ph.D. Fellowship ; EACOA Fellowship ; Academia Sinica Institute of Astronomy and Astrophysics ; East Asia Core Observatories Association ; National Astronomical Observatory of Japan ; Center for Astronomical Mega-Science ; Chinese Academy of Sciences ; Korea Astronomy and Space Science Institute ; Spanish Ministerio de Economia y Competitividad ; Mitsubishi Foundation ; JSPS/MEXT KAKENHI ; JSPS KAKENHI ; National Research Foundation (NRF) of Korea ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education ; National Research Foundation of Korea (NRF) - Korea government (MIST) ; China Postdoctoral Science Foundation ; Key Program of the National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; Shanghai Pilot Program for Basic Research - Chinese Academy of Sciences, Shanghai Branch ; Max Planck Partner Group of the MPG and the CAS ; Major Program of the National Natural Science Foundation of China ; National Research Foundation of Korea |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5304]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Ro, Hyunwook |
| 作者单位 | 1.Chungbuk Natl Univ, Basic Sci Res Inst, Chungdae Ro 1, Cheongju 28644, South Korea 2.UNIST, Dept Phys, Ulsan 44919, South Korea 3.Univ Tokyo, Dept Astron, 7-3-1 Hongo, Tokyo 1130033, Japan 4.Natl Astron Res Inst Thailand, Publ Org, 260 Moo 4 T Donkaew A Maerim, Chiangmai 50180, Thailand 5.Niigata Univ, 8050 Ikarashi 2 No Cho,Nishi Ku, Niigata 9502181, Japan 6.Toyo Univ, 5-28-20 Hakusan,Bunkyo Ku, Tokyo 1128606, Japan 7.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 8.Harvard Univ, Black Hole Initiat, 20 Garden St, Cambridge, MA 02138 USA 9.MIT, Haystack Observ, 99 Millstone Rd, Westford, MA 01886 USA 10.Tokyo Electron Technol Solut Ltd, Iwate 0231101, Japan |
| 推荐引用方式 GB/T 7714 | Ro, Hyunwook,Kino, Motoki,Sohn, Bong Won,et al. Spectral analysis of a parsec-scale jet in M 87: Observational constraint on the magnetic field strengths in the jet[J]. ASTRONOMY & ASTROPHYSICS,2023,673:16. |
| APA | Ro, Hyunwook.,Kino, Motoki.,Sohn, Bong Won.,Hada, Kazuhiro.,Park, Jongho.,...&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,673,16. |
| MLA | Ro, Hyunwook,et al."Spectral analysis of a parsec-scale jet in M 87: Observational constraint on the magnetic field strengths in the jet".ASTRONOMY & ASTROPHYSICS 673(2023):16. |
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