Resolved magnetic-field structure and variability near the event horizon of Sagittarius A
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Author
Fish, V. L.
Marrone, D. P.
Plambeck, R. L.
Wardle, J. F. C.
Akiyama, K.
Asada, K.
Beaudoin, C.
Bower, G. C.
Brinkerink, C.
Broderick, A. E.
Cappallo, R.
Crew, G. B.
Dexter, J.
Dexter, M.
Freund, R.
Friberg, P.
Gold, R.
Gurwell, M. A.
Ho, P. T. P.
Honma, M.
Inoue, M.
Krichbaum, T. P.
Lamb, J.
Lu, R.-S.
MacMahon, D.
McKinney, J. C.
Psaltis, D.
Rogers, A. E. E.
SooHoo, J.
Tilanus, R. P. J.
Titus, M.
Vertatschitsch, L.
Wright, M.
Zensus, J. A.
Ziurys, L. M.
Note: Order does not necessarily reflect citation order of authors.
Published Version
https://doi.org/10.1126/science.aac7087Metadata
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Johnson, M. D., V. L. Fish, S. S. Doeleman, D. P. Marrone, R. L. Plambeck, J. F. C. Wardle, K. Akiyama, et al. 2015. “Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius A.” Science 350 (6265) (December 3): 1242–1245. doi:10.1126/science.aac7087.Abstract
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 horizonscale 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 fields near the event horizon, on scales of ∼6 Schwarzschild radii, and we have detected and localized the intra-hour variability associated with these fields.Other Sources
https://arxiv.org/abs/1512.01220Terms of Use
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http://nrs.harvard.edu/urn-3:HUL.InstRepos:27770119
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