Resolved magnetic-field structure and variability near the event horizon of Sagittarius A☆

被引：179

作者：

Johnson, Michael D. ^{[1
]}

Fish, Vincent L. ^{[2
]}

Doeleman, Sheperd S. ^{[1
,2
]}

Marrone, Daniel P. ^{[3
]}

Plambeck, Richard L. ^{[4
]}

Wardle, John F. C. ^{[5
]}

Akiyama, Kazunori ^{[2
,6
,7
]}

Asada, Keiichi ^{[8
]}

Beaudoin, Christopher ^{[2
]}

Blackburn, Lindy ^{[1
]}

Blundell, Ray ^{[1
]}

Bower, Geoffrey C. ^{[9
]}

Brinkerink, Christiaan ^{[10
]}

Broderick, Avery E. ^{[11
,12
]}

Cappallo, Roger ^{[2
]}

Chael, Andrew A. ^{[1
]}

Crew, Geoffrey B. ^{[2
]}

Dexter, Jason ^{[13
]}

Dexter, Matt ^{[4
]}

Freund, Robert ^{[3
]}

Friberg, Per ^{[14
]}

Gold, Roman ^{[15
]}

Gurwell, Mark A. ^{[1
]}

Ho, Paul T. P. ^{[8
]}

Honma, Mareki ^{[6
,16
]}

Inoue, Makoto ^{[8
]}

Kosowsky, Michael ^{[1
,2
,5
]}

Krichbaum, Thomas P. ^{[17
]}

Lamb, James ^{[18
]}

Loeb, Abraham ^{[1
]}

Lu, Ru-Sen ^{[2
,17
]}

MacMahon, David ^{[4
]}

McKinney, Jonathan C.

Moran, James M. ^{[1
]}

Narayan, Ramesh ^{[1
]}

Primiani, Rurik A. ^{[1
]}

Psaltis, Dimitrios ^{[3
]}

Rogers, Alan E. E. ^{[2
]}

Rosenfeld, Katherine ^{[1
]}

SooHoo, Jason ^{[2
]}

Tilanus, Remo P. J. ^{[10
,19
]}

Titus, Michael ^{[2
]}

Vertatschitsch, Laura ^{[1
]}

Weintroub, Jonathan ^{[1
,15
]}

Wright, Melvyn ^{[4
]}

Young, Ken H. ^{[1
]}

Zensus, J. Anton ^{[17
]}

Ziurys, Lucy M. ^{[3
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] MIT, Haystack Observ, Westford, MA 01886 USA

[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[4] Univ Calif Berkeley, Dept Astron, Radio Astron Lab, Berkeley, CA 94720 USA

[5] Brandeis Univ, Dept Phys MS 057, Waltham, MA 02454 USA

[6] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[7] Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[8] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan

[9] ASIAA, Hilo, HI 96720 USA

[10] Radboud Univ Nijmegen, Inst Math Astrophys & Particle Phys, Dept Astrophys, NL-6500 GL Nijmegen, Netherlands

[11] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[12] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[13] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[14] James Clerk Maxwell Telescope, East Asia Observ, Hilo, HI 96720 USA

[15] Univ Maryland, Dept Phys, Joint Space Sci Inst, College Pk, MD 20742 USA

[16] Grad Univ Adv Studies, Mitaka, Tokyo 1818588, Japan

[17] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[18] CALTECH, Owens Valley Radio Observ, Big Pine, CA 93513 USA

[19] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

来源：

SCIENCE | 2015年 / 350卷 / 6265期

基金：

美国国家科学基金会; 日本学术振兴会; 加拿大自然科学与工程研究理事会;

关键词：

SGR-A-ASTERISK; SUPERMASSIVE BLACK-HOLE; ACCRETION FLOW MODELS; NEAR-INFRARED FLARES; GALACTIC-CENTER; CIRCULAR-POLARIZATION; LINEAR-POLARIZATION; STELLAR ORBITS; SIMULATIONS; POLARIMETRY;

D O I：

10.1126/science.aac7087

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Near a black hole, differential rotation of a magnetized accretion disk is thought to produce an instability that amplifies weak magnetic fields, driving accretion and outflow. These magnetic fields would naturally give rise to the observed synchrotron emission in galaxy cores and to the formation of relativistic jets, but no observations to date have been able to resolve the expected horizon-scale magnetic-field structure. We report interferometric observations at 1.3-millimeter wavelength that spatially resolve the linearly polarized emission from the Galactic Center supermassive black hole, Sagittarius A*. We have found evidence for partially ordered magnetic fields near the event horizon, on scales of similar to 6 Schwarzschild radii, and we have detected and localized the intrahour variability associated with these fields.

引用

页码：1242 / 1245

页数：4

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