Spatially resolved origin of millimeter-wave linear polarization in the nuclear region of 3C 84

doi:10.1051/0004-6361/201832920

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	Spatially resolved origin of millimeter-wave linear polarization in the nuclear region of 3C 84
	Kim, J. -Y.1; Krichbaum, T. P.1; Marscher, A. P.2; Jorstad, S. G.2,3; Agudo, I.4; Thum, C.5; Hodgson, J. A.6; MacDonald, N. R.1; Ros, E.1; Lu, R. -S.1,7
刊名	ASTRONOMY & ASTROPHYSICS
	2019-02-19
卷号	622 页码:18
关键词	galaxies: active galaxies: jets galaxies: individual: NGC 1275 galaxies: individual: 3C 84 techniques: interferometric techniques: polarimetric
ISSN号	1432-0746
DOI	10.1051/0004-6361/201832920
英文摘要	We report results from a deep polarization imaging of the nearby radio galaxy 3C 84 (NGC 1275). The source was observed with the Global Millimeter VLBI Array (GMVA) at 86 GHz at an ultrahigh angular resolution of 50 mu as (corresponding to similar to 200R(s)). We also add complementary multiwavelength data from the Very Long Baseline Array (VLBA; 15 and 43 GHz) and from the Atacama Large Millimeter/submillimeter Array (ALMA; 97.5, 233.0 and 343.5 GHz). At 86 GHz, we measured a fractional linear polarization of similar to 2% in the VLBI core region. The polarization morphology suggests that the emission is associated with an underlying limb-brightened jet. The fractional linear polarization is lower at 43 and 15 GHz (similar to 0.3-0.7% and <0.1%, respectively). This suggests an increasing linear polarization degree toward shorter wavelengths on VLBI scales. We also obtain a large rotation measure (RM) of similar to 10(5-6) rad m(2) in the core at greater than or similar to 43 GHz. Moreover, the VLBA 43 GHz observations show a variable RM in the VLBI core region during a small flare in 2015. Faraday depolarization and Faraday conversion in an inhomogeneous and mildly relativistic plasma could explain the observed linear polarization characteristics and the previously measured frequency dependence of the circular polarization. Our Faraday depolarization modeling suggests that the RM most likely originates from an external screen with a highly uniform RM distribution. To explain the large RM value, the uniform RM distribution and the RM variability, we suggest that the Faraday rotation is caused by a boundary layer in a transversely stratified jet. Based on the RM and the synchrotron spectrum of the core, we provide an estimate for the magnetic field strength and the electron density of the jet plasma.
资助项目	International Max-Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Bonn and Cologne ; Ramon y Cajal grant of the Ministerio de Economia, Industria y Competitividad (MINECO) of Spain ; MINECO[AYA2016-80889-P] ; National Youth Thousand Talents Program of China ; Max-Planck Partner Group ; NASA through the Fermi Guest Investigator Program ; NASA[NNX08AW31G] ; NASA[NNX11A043G] ; NSF[AST-0808050] ; NSF[AST-1109911]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000458946800002
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31915]
专题	中国科学院上海天文台
通讯作者	Kim, J. -Y.
作者单位	1.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 2.Boston Univ, Inst Astrophys Res, 725 Commonwealth Ave, Boston, MA 02215 USA 3.St Petersburg State Univ, Astron Inst, Univ Skij Pr 28, St Petersburg 198504, Russia 4.CSIC, Inst Astrofis Andalucia, Apartado 3004, E-18080 Granada, Spain 5.Inst Radio Astron Millimetr, Ave Divina Pastora 7,Local 20, Granada 18012, Spain 6.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 30455, South Korea 7.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 8.Inst Radio Astron Millimetr, 300 Rue Piscine,Domaine Univ, F-38406 St Martin Dheres, France 9.Observat Yebes IGN, Apartado 148, Yebes 19180, Spain 10.Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden
推荐引用方式 GB/T 7714	Kim, J. -Y.,Krichbaum, T. P.,Marscher, A. P.,et al. Spatially resolved origin of millimeter-wave linear polarization in the nuclear region of 3C 84[J]. ASTRONOMY & ASTROPHYSICS,2019,622:18.
APA	Kim, J. -Y..,Krichbaum, T. P..,Marscher, A. P..,Jorstad, S. G..,Agudo, I..,...&Zensus, J. A..(2019).Spatially resolved origin of millimeter-wave linear polarization in the nuclear region of 3C 84.ASTRONOMY & ASTROPHYSICS,622,18.
MLA	Kim, J. -Y.,et al."Spatially resolved origin of millimeter-wave linear polarization in the nuclear region of 3C 84".ASTRONOMY & ASTROPHYSICS 622(2019):18.