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Full-polarization millimeter wavelength variability of Sagittarius A* during the 2018 EHT campaign

文献类型：期刊论文

作者Albentosa, Ezequiel4; Washington, Jasmin E.14; Marchili, Nicola6,108; Martí, Iván4,12; Goddi, Ciriaco30,70,71,72; Wielgus, Maciek5; Mus, Alejandro70,108; Ricarte, Angelo3,10; Marrone, Daniel P.14; Salas, León D. S.115
刊名ASTRONOMY & ASTROPHYSICS
出版日期2026-04-08
卷号708
关键词black hole physics techniques: interferometric techniques: polarimetric Galaxy: center
ISSN号0004-6361
DOI10.1051/0004-6361/202556759
产权排序第112完成单位
文献子类Article
英文摘要Context. Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way, provides a unique laboratory to study accretion dynamics and plasma processes near the event horizon. Aims. We investigated the variability and polarization properties of Sgr A* using ALMA observations during the 2018 Event Horizon Telescope campaign. Methods. We analyzed high-cadence full-polarization light curves from ALMA at millimeter wavelengths, performed time-series analysis, and investigated the temporal behavior during an X-ray flare observed by Chandra on 2018 April 24. The variability characteristics are compared with expectations from standard accretion flow models. Results. We find low variability in total intensity (sigma/mu < 10%), but significantly higher variability in linear and circular polarization ( similar to 30% and similar to 50%, respectively). A time-series analysis reveals red-noise variability, with power spectral densities between 2 and 3 across all Stokes parameters. Polarized intensity shows stable intra-day timescales, while total intensity exhibits more variable timescales, suggesting distinct emission regions, with polarization likely arising from a coherent structure. On April 24, a statistically significant inter-band delay in polarized intensity coincides with a near-simultaneous X-ray and millimeter peak that deviates from the typical delayed flare scenario. This event also features enhanced millimeter variability and coherent polarization loop evolution. The observed simultaneity challenges standard models of transient synchrotron emission with cooling delays, favoring instead a scenario of continuous energy injection in an optically thin region. Conclusions. Our results offer new constraints on the physical mechanisms driving variability in Sgr A*, and provide key observational input for refining theoretical models of accretion and plasma behavior in the vicinity of supermassive black holes.
学科主题天文学 ; 星系与宇宙学
URL标识查看原文
出版地17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
WOS关键词NEAR-INFRARED FLARES ; MAGNETICALLY ARRESTED ACCRETION ; SUPERMASSIVE BLACK-HOLE ; X-RAY FLARES ; EVENT HORIZON ; GALACTIC-CENTER ; LINEAR-POLARIZATION ; LIGHT CURVES ; FARADAY-ROTATION ; HOT-SPOTS
资助项目Academia Sinica; Academy of Finland[274477]; Academy of Finland[284495]; Academy of Finland[312496]; Academy of Finland[315721]; Agencia Nacional de Investigacion y Desarrollo[NCN19_058]; Fondecyt[1221421]; BASAL[FB210003]; Alexander von Humboldt Stiftung; Alfred P. Sloan Research Fellowship; European ALMA Regional Centre node in the Netherlands; NOVA; ALMA North America Development Fund; Black Hole Initiative (John Templeton Foundation)[60477]; Black Hole Initiative (John Templeton Foundation)[61497]; Black Hole Initiative (John Templeton Foundation)[62286]; Gordon and Betty Moore Foundation[GBMF-8273]; Brinson Foundation; la Caixa Foundation[100010434]; la Caixa Foundation[LCF/BQ/DI22/11940030]; Canada Research Chairs program[DD7-18089X]; Canada Research Chairs program[TM6-17006X]; China Scholarship Council; China Postdoctoral Science Foundation[2020M671266]; China Postdoctoral Science Foundation[2022M712084]; Conicyt Fondecyt Postdoctorado[3220195]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[U0004-246083]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[U0004-259839]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[F0003-272050]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[F0003-281692]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[104497]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[275201]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[263356]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[CBF2023-2024-1102]; Consejo Nacional de Humanidades, Ciencia y Tecnologia[257435]; Colfuturo Scholarship; Junta de Andalucia[P18-FR-1769]; Consejo Superior de Investigaciones Cientificas[2019AEP112]; DGAPA-UNAM[IN112820]; DGAPA-UNAM[IN108324]; Dutch Research Council (NWO) VICI award[639.043.513]; Dutch Research Council (NWO) VICI award[OCENW.KLEIN.113]; Dutch Black Hole Consortium; Dutch Supercomputers Cartesius[NWO 2021.013]; Dutch Supercomputers Cartesius[610058]; Dutch Supercomputers Cartesius[10107164]; EU[10108625]; ERC[884631]; Horizon ERC[101040021]; FAPESP[2021/01183-8]; Fonds de Recherche du Quebec -Nature et Technologies (FRQNT); Fondo CAS-ANID[CAS220010]; Fondo CAS-ANID[GBMF-3561]; Fondo CAS-ANID[GBMF-5278]; Fondo CAS-ANID[GBMF-10423]; Institute for Advanced Study; INFN Napoli TEONGRAV[2022YAP-MJH]; DFG research grant Jet physics on horizon scales and beyond[443220636]; Japan MEXT[JPMXP1020200109]; Japan MEXT[JP17J08829]; CAS Frontier Sciences Program[QYZDJ-SSW-SLH057]; CAS Frontier Sciences Program[QYZDJSSW-SYS008]; CAS Frontier Sciences Program[ZDBS-LY-SLH011]; Leverhulme Trust Early Career Fellowship; Max-Planck-Gesellschaft (MPG); Max Planck Partner Group of MPG; CAS; MEXT/JSPS KAKENHI[18KK0090]; MEXT/JSPS KAKENHI[JP21H01137]; MEXT/JSPS KAKENHI[JP18H03721]; MEXT/JSPS KAKENHI[JP18K13594]; MEXT/JSPS KAKENHI[18K03709]; MEXT/JSPS KAKENHI[JP19K14761]; MEXT/JSPS KAKENHI[18H01245]; MEXT/JSPS KAKENHI[25120007]; MEXT/JSPS KAKENHI[21H01137]; MEXT/JSPS KAKENHI[21H04488]; MEXT/JSPS KAKENHI[22H00157]; MEXT/JSPS KAKENHI[23K03453]; MEXT/JSPS KAKENHI[CIDEGENT/2018/021]; MEXT/JSPS KAKENHI[ASFAE/2022/018]; MICINN[PID2019-108995GB-C22]; MICINN[PID2022-140888NB-C22]; MICINN[PRTR-C17I1]; MIT International Science and Technology Initiatives (MISTI); Ministry of Science and Technology (MOST) of Taiwan[103-110]; NSTC of Taiwan[111-2124-M-001-005]; NSTC of Taiwan[112-2124-M-001-014]; NSTC of Taiwan[112-2112-M-003-010-MY3]; Taiwan MoE Yushan Young Scholar Program; National Center for Theoretical Sciences of Taiwan; NASA[80NSSC23K1508]; NASA[80NSSC20K0527]; NASA[80NSSC20K0645]; NASA Hubble Fellowship Program (Einstein Fellowship)[HST-HF2-51431.001-A]; NASA Hubble Fellowship Program (Einstein Fellowship)[HST-HF2-51482.001-A]; NASA Hubble Fellowship Program (Einstein Fellowship)[HST-HF2-51539.001-A]; NASA Hubble Fellowship Program (Einstein Fellowship)[HST-HF2-51552.001A]; National Key R&D Program of China[2016YFA0400704]; National Key R&D Program of China[2017YFA0402703]; National Key R&D Program of China[2016YFA0400702]; NSTC[111-2124-M-001-005]; NSTC[112-2124-M-001-014]; NSTC[111-2112-M-001-041]; US NSF[AST-0905844]; US NSF[AST-0922984]; US NSF[AST-1126433]; US NSF[OIA-1126433]; US NSF[AST-1140030]; US NSF[DGE-1144085]; NSF Astronomy and Astrophysics Postdoctoral Fellowship[AST-1903847]; NSERC; NRF Korea[NRF-2015H1D3A1066561]; NRF Korea[RS-2024-00407499]; NRF Korea[2019R1F1A1059721]; NRF Korea[2021R1A6A3A01086420]; NRF Korea[2022R1C1C1005255]; NRF Korea[2022R1F1A1075115]; NOVA Virtual Institute of Accretion fellowships[2017-00648]; Perimeter Institute (Government of Canada); Portuguese FCT[UIDB/04106/2020]; Portuguese FCT[UIDP/04106/2020]; Portuguese FCT[PTDC/FIS-AST/3041/2020]; Portuguese FCT[CERN/FIS-PAR/0024/2021]; Portuguese FCT[2022.04560]; (PTDC); Princeton Gravity Initiative; Ministerio de Ciencia e Innovacion, Spain[PGC2018-098915-B-C21]; Ministerio de Ciencia e Innovacion, Spain[AYA2016-80889-P]; Ministerio de Ciencia e Innovacion, Spain[PID2019-108995GB-C21]; Ministerio de Ciencia e Innovacion, Spain[PID2020-117404GB-C21]; Ministerio de Ciencia e Innovacion, Spain[RYC2023-042988-I]; University of Pretoria; Shanghai Municipality[22JC1410600]; Shanghai CAS Pilot Program[JCYJ-SHFY-2021-013]; Shanghai CAS Pilot Program[CEX2021-001131-S]; Spinoza Prize SPI[78-409]; Spinoza Prize SPI[77948]; Swedish Research Council (VR); Taplin Fellowship; Toray Science Foundation; UK STFC[ST/X508329/1]; US DOE via LANL[89233218CNA000001]; US DOE via LANL[RS-2024-00449206]; CAPES Brazil PROEX[88887.845378/2023-00]; Millenium Nucleus[NCN23_002]; Comite Mixto ESO-Chile[PRE2020-092200]; Comite Mixto ESO-Chile[MCIN/AEI/10.13039/501100011033]; ESF invest in your future - Smithsonian Institution;
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001745763300001
出版者EDP SCIENCES S A
资助机构Academia Sinica ; Academy of Finland[274477, 284495, 312496, 315721] ; Agencia Nacional de Investigacion y Desarrollo[NCN19_058] ; Fondecyt[1221421] ; BASAL[FB210003] ; Alexander von Humboldt Stiftung ; Alfred P. Sloan Research Fellowship ; European ALMA Regional Centre node in the Netherlands ; NOVA ; ALMA North America Development Fund ; Black Hole Initiative (John Templeton Foundation)[60477, 61497, 62286] ; Gordon and Betty Moore Foundation[GBMF-8273] ; Brinson Foundation ; la Caixa Foundation[100010434, LCF/BQ/DI22/11940030] ; Canada Research Chairs program[DD7-18089X, TM6-17006X] ; China Scholarship Council ; China Postdoctoral Science Foundation[2020M671266, 2022M712084] ; Conicyt Fondecyt Postdoctorado[3220195] ; Consejo Nacional de Humanidades, Ciencia y Tecnologia[U0004-246083, U0004-259839, F0003-272050, F0003-281692, 104497, 275201, 263356, CBF2023-2024-1102, 257435] ; Colfuturo Scholarship ; Junta de Andalucia[P18-FR-1769] ; Consejo Superior de Investigaciones Cientificas[2019AEP112] ; DGAPA-UNAM[IN112820, IN108324] ; Dutch Research Council (NWO) VICI award[639.043.513, OCENW.KLEIN.113] ; Dutch Black Hole Consortium ; Dutch Supercomputers Cartesius[NWO 2021.013, 610058, 10107164] ; EU[10108625] ; ERC[884631] ; Horizon ERC[101040021] ; FAPESP[2021/01183-8] ; Fonds de Recherche du Quebec -Nature et Technologies (FRQNT) ; Fondo CAS-ANID[CAS220010, GBMF-3561, GBMF-5278, GBMF-10423] ; Institute for Advanced Study ; INFN Napoli TEONGRAV[2022YAP-MJH] ; DFG research grant Jet physics on horizon scales and beyond[443220636] ; Japan MEXT[JPMXP1020200109, JP17J08829] ; CAS Frontier Sciences Program[QYZDJ-SSW-SLH057, QYZDJSSW-SYS008, ZDBS-LY-SLH011] ; Leverhulme Trust Early Career Fellowship ; Max-Planck-Gesellschaft (MPG) ; Max Planck Partner Group of MPG ; CAS ; MEXT/JSPS KAKENHI[18KK0090, JP21H01137, JP18H03721, JP18K13594, 18K03709, JP19K14761, 18H01245, 25120007, 21H01137, 21H04488, 22H00157, 23K03453, CIDEGENT/2018/021, ASFAE/2022/018] ; MICINN[PID2019-108995GB-C22, PID2022-140888NB-C22, PRTR-C17I1] ; MIT International Science and Technology Initiatives (MISTI) ; Ministry of Science and Technology (MOST) of Taiwan[103-110] ; NSTC of Taiwan[111-2124-M-001-005, 112-2124-M-001-014, 112-2112-M-003-010-MY3] ; Taiwan MoE Yushan Young Scholar Program ; National Center for Theoretical Sciences of Taiwan ; NASA[80NSSC23K1508, 80NSSC20K0527, 80NSSC20K0645] ; NASA Hubble Fellowship Program (Einstein Fellowship)[HST-HF2-51431.001-A, HST-HF2-51482.001-A, HST-HF2-51539.001-A, HST-HF2-51552.001A] ; National Key R&D Program of China[2016YFA0400704, 2017YFA0402703, 2016YFA0400702] ; NSTC[111-2124-M-001-005, 112-2124-M-001-014, 111-2112-M-001-041] ; US NSF[AST-0905844, AST-0922984, AST-1126433, OIA-1126433, AST-1140030, DGE-1144085] ; NSF Astronomy and Astrophysics Postdoctoral Fellowship[AST-1903847] ; NSERC ; NRF Korea[NRF-2015H1D3A1066561, RS-2024-00407499, 2019R1F1A1059721, 2021R1A6A3A01086420, 2022R1C1C1005255, 2022R1F1A1075115] ; NOVA Virtual Institute of Accretion fellowships[2017-00648] ; Perimeter Institute (Government of Canada) ; Portuguese FCT[UIDB/04106/2020, UIDP/04106/2020, PTDC/FIS-AST/3041/2020, CERN/FIS-PAR/0024/2021, 2022.04560] ; (PTDC) ; Princeton Gravity Initiative ; Ministerio de Ciencia e Innovacion, Spain[PGC2018-098915-B-C21, AYA2016-80889-P, PID2019-108995GB-C21, PID2020-117404GB-C21, RYC2023-042988-I] ; University of Pretoria ; Shanghai Municipality[22JC1410600] ; Shanghai CAS Pilot Program[JCYJ-SHFY-2021-013, CEX2021-001131-S] ; Spinoza Prize SPI[78-409, 77948] ; Swedish Research Council (VR) ; Taplin Fellowship ; Toray Science Foundation ; UK STFC[ST/X508329/1] ; US DOE via LANL[89233218CNA000001, RS-2024-00449206] ; CAPES Brazil PROEX[88887.845378/2023-00] ; Millenium Nucleus[NCN23_002] ; Comite Mixto ESO-Chile[PRE2020-092200, MCIN/AEI/10.13039/501100011033] ; ESF invest in your future - Smithsonian Institution ; [AST-1207704] ; [AST-1207730] ; [AST-1207752] ; [MRI-1228509] ; [OPP-1248097] ; [AST-1310896] ; [AST-1440254] ; [AST-1555365] ; [AST-1614868] ; [AST-1615796] ; [AST-1715061] ; [AST-1716327] ; [AST-1726637] ; [OISE-1743747] ; [AST-1743747] ; [AST-1816420] ; [AST-1935980] ; [AST-1952099] ; [AST-2034306] ; [AST-2205908] ; [AST-2307887]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/29169]  
专题云南天文台_中国科学院天体结构与演化重点实验室
通讯作者Albentosa, Ezequiel
作者单位1.Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, MA 01886, USA;
2.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;
3.Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA;
4.Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, E-46100 Burjassot, València, Spain;
5.Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain;
6.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany;
7.Department of Physics, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia;
8.Department of Physics & Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA;
9.Physics & Astronomy Department, Rice University, Houston, TX 77005-1827, USA;
10.Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA;
推荐引用方式
GB/T 7714		 Albentosa, Ezequiel,Washington, Jasmin E.,Marchili, Nicola,et al. Full-polarization millimeter wavelength variability of Sagittarius A* during the 2018 EHT campaign[J]. ASTRONOMY & ASTROPHYSICS,2026,708.
APA Albentosa, Ezequiel.,Washington, Jasmin E..,Marchili, Nicola.,Martí, Iván.,Goddi, Ciriaco.,...&Zhao, Shan-Shan.(2026).Full-polarization millimeter wavelength variability of Sagittarius A* during the 2018 EHT campaign.ASTRONOMY & ASTROPHYSICS,708.
MLA Albentosa, Ezequiel,et al."Full-polarization millimeter wavelength variability of Sagittarius A* during the 2018 EHT campaign".ASTRONOMY & ASTROPHYSICS 708(2026).

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