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Subparsec Acceleration and Collimation of NGC 4261's Twin Jets

文献类型：期刊论文

作者Yan, Xi11; Cui, Lang11,12,13; Hada, Kazuhiro14,15; Frey, Sandor2,3,4; Lu, Ru-sen5,6,12; Chen, Liang5; Xu, Wancheng7,11; Fariyanto, Elika P.8,9; Ho, Luis C.1,10
刊名ASTROPHYSICAL JOURNAL
出版日期2025-09-20
卷号991期号:1页码:75
ISSN号0004-637X
DOI10.3847/1538-4357/adf84c
产权排序1
英文摘要We report the first robust evidence for a cospatial subparsec acceleration and collimation zone (ACZ) in the twin jets of the nearby low-luminosity active galactic nucleus NGC 4261. This result is derived from multifrequency Very Long Baseline Array imaging, combined with the frequency-dependent properties of the radio core (core shift and core size) and jet kinematics determined from the jet-to-counterjet brightness ratio. By applying multiple analysis methods and incorporating results from the literature, we identify a parabolic-to-conical structural transition in both the jet and counterjet, with the transition occurring at (1.23 +/- 0.24) pc or (8.1 +/- 1.6) x 103 Rs (Schwarzschild radii) for the jet and (0.97 +/- 0.29) pc or (6.4 +/- 1.9) x 103 Rs for the counterjet. We also derive the jet velocity field at distances of similar to(103-2 x 104) Rs. While local kinematic variations are present, the jet shows an overall acceleration to relativistic speeds from similar to 103 to similar to 8 x 103 Rs, with a maximum Lorentz factor of Gamma max approximate to 2.6 . Beyond this region, the jet gradually decelerates to subrelativistic speeds. These findings support the existence of a subparsec-scale (less than or similar to 1.5 pc) ACZ in NGC 4261, where the jet is accelerated via magnetic-to-kinetic energy conversion while being confined by external pressure. A brief comparison with M87 suggests that the ACZ in NGC 4261 may represent a scaled-down analog of that in M87. These results point toward a potential diversity in jet ACZ properties, emphasizing the importance of extending such studies to a broader AGN population to elucidate the physical mechanisms at play.
WOS关键词ACTIVE GALACTIC NUCLEUS ; BASE-LINE INTERFEROMETRY ; SUPERMASSIVE BLACK-HOLES ; LIMB-BRIGHTENED JET ; DENSE-PLASMA TORUS ; PARSEC-SCALE JET ; 3C 270 NGC-4261 ; M87 JET ; RELATIVISTIC JETS ; ACCRETION DISK
资助项目CAS Light of West China Program[2021-XBQNXZ-005] ; National SKA Program of China[2022SKA0120102] ; China Postdoctoral Science Foundation[2025M773200] ; Xinjiang Tianchi Talent Program ; Xinjiang Uygur Autonomous Region ; Tianshan Talent Training Program[2023TSYCCX0099] ; MEXT/JSPS KAKENHI[25H00660] ; MEXT/JSPS KAKENHI[22H00157] ; MEXT/JSPS KAKENHI[21H04488] ; Mitsubishi Foundation[202310034] ; Hungarian National Research, Development and Innovation Office (NKFIH)[OTKA K134213] ; Hungarian National Research, Development and Innovation Office (NKFIH)[TKP2021-NKTA-64] ; National Science Fund for Distinguished Young Scholars of China[12325302] ; Shanghai Pilot Program for Basic Research, CAS[JCYJ-SHFY-2021-013] ; NSFC[12173066] ; National Key R&D program of China[2024YFA1611403] ; Shanghai Pilot Programme for Basic Research, CAS Shanghai Branch[JCYJ-SHFY-2021-013] ; National Science Foundation of China[12233001] ; National Key R&D Program of China[2022YFF0503401] ; Urumqi Nanshan Astronomy and Deep Space Exploration Observation and Research Station of Xinjiang[XJYWZ2303]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001572899800001
出版者IOP Publishing Ltd
资助机构CAS Light of West China Program ; National SKA Program of China ; China Postdoctoral Science Foundation ; Xinjiang Tianchi Talent Program ; Xinjiang Uygur Autonomous Region ; Tianshan Talent Training Program ; MEXT/JSPS KAKENHI ; Mitsubishi Foundation ; Hungarian National Research, Development and Innovation Office (NKFIH) ; National Science Fund for Distinguished Young Scholars of China ; Shanghai Pilot Program for Basic Research, CAS ; NSFC ; National Key R&D program of China ; Shanghai Pilot Programme for Basic Research, CAS Shanghai Branch ; National Science Foundation of China ; National Key R&D Program of China ; Urumqi Nanshan Astronomy and Deep Space Exploration Observation and Research Station of Xinjiang
源URL[http://ir.xao.ac.cn/handle/45760611-7/8138]  
专题星系宇宙学研究团组
通讯作者Cui, Lang
作者单位1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
2.HUN REN Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
3.MTA Ctr Excellence, CSFK, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
4.Eotvos Lorand Univ, Inst Phys & Astron, Pazmany Peter Setany 1-A, H-1117 Budapest, Hungary
5.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
7.Univ Chinese Acad Sci, Coll Astron & Space Sci, 1 Yanqihu East Rd, Beijing 101408, Peoples R China
8.Univ Tokyo, Grad Sch Sci, Dept Astron, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan
9.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
10.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714		 Yan, Xi,Cui, Lang,Hada, Kazuhiro,et al. Subparsec Acceleration and Collimation of NGC 4261's Twin Jets[J]. ASTROPHYSICAL JOURNAL,2025,991(1):75.
APA Yan, Xi.,Cui, Lang.,Hada, Kazuhiro.,Frey, Sandor.,Lu, Ru-sen.,...&Ho, Luis C..(2025).Subparsec Acceleration and Collimation of NGC 4261's Twin Jets.ASTROPHYSICAL JOURNAL,991(1),75.
MLA Yan, Xi,et al."Subparsec Acceleration and Collimation of NGC 4261's Twin Jets".ASTROPHYSICAL JOURNAL 991.1(2025):75.

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来源：新疆天文台

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