Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius A*

Abraham Loeb; Alan E. E. Rogers; Andrew A. Chael; Avery E. Broderick; Christiaan Brinkerink; Christopher Beaudoin; Daniel P. Marrone; David MacMahon; Dimitrios Psaltis; Geoffrey B. Crew

Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius A*

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arxiv 1512.01220 v1 pith:G5PYXLOB submitted 2015-12-03 astro-ph.HE astro-ph.GAastro-ph.IM

Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius A*

Michael D. Johnson , Vincent L. Fish , Sheperd S. Doeleman , Daniel P. Marrone , Richard L. Plambeck , John F. C. Wardle , Kazunori Akiyama , Keiichi Asada

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Christopher Beaudoin Lindy Blackburn Ray Blundell Geoffrey C. Bower Christiaan Brinkerink Avery E. Broderick Roger Cappallo Andrew A. Chael Geoffrey B. Crew Jason Dexter Matt Dexter Robert Freund Per Friberg Roman Gold Mark A. Gurwell Paul T. P. Ho Mareki Honma Makoto Inoue Michael Kosowsky Thomas P. Krichbaum James Lamb Abraham Loeb Ru-Sen Lu David MacMahon Jonathan C. McKinney James M. Moran Ramesh Narayan Rurik A. Primiani Dimitrios Psaltis Alan E. E. Rogers Katherine Rosenfeld Jason SooHoo Remo P. J. Tilanus Michael Titus Laura Vertatschitsch Jonathan Weintroub Melvyn Wright Ken H. Young J. Anton Zensus Lucy M. Ziurys

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keywords fieldsnearaccretionblackemissioneventholehorizon

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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 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.

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Chaotic behaviors of particles around the black hole with an anisotropic matter immersed in a magnetic field
gr-qc 2026-07 unverdicted novelty 4.0

Exact black hole solution with anisotropic matter and magnetic field shows the matter parameter reduces local chaos (Lyapunov exponent) while the magnetic field drives qualitative shifts in global chaos (Poincaré sections).