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, 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 FreundPer 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 Soo Hoo, 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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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 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 ∼6 Schwarzschild radii, and we have detected and localized the intrahour variability associated with these fields.

Original languageEnglish (US)
Pages (from-to)1242-1245
Number of pages4
JournalScience
Volume350
Issue number6265
DOIs
StatePublished - Dec 4 2015

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event horizon
magnetic fields
accretion disks
horizon
synchrotrons
galaxies
radii
wavelengths

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Resolved magnetic-field structure and variability near the event horizon of Sagittarius A∗. / Johnson, Michael D.; Fish, Vincent L.; Doeleman, Sheperd S.; Marrone, Daniel P; Plambeck, Richard L.; Wardle, John F C; Akiyama, Kazunori; Asada, Keiichi; Beaudoin, Christopher; Blackburn, Lindy; Blundell, Ray; Bower, Geoffrey C.; Brinkerink, Christiaan; Broderick, Avery E.; Cappallo, Roger; Chael, Andrew A.; Crew, Geoffrey B.; Dexter, Jason; Dexter, Matt; Freund, Robert; Friberg, Per; Gold, Roman; Gurwell, Mark A.; Ho, Paul T P; Honma, Mareki; Inoue, Makoto; Kosowsky, Michael; Krichbaum, Thomas P.; Lamb, James; Loeb, Abraham; Lu, Ru Sen; MacMahon, David; McKinney, Jonathan C.; Moran, James M.; Narayan, Ramesh; Primiani, Rurik A.; Psaltis, Dimitrios; Rogers, Alan E E; Rosenfeld, Katherine; Hoo, Jason Soo; Tilanus, Remo P J; Titus, Michael; Vertatschitsch, Laura; Weintroub, Jonathan; Wright, Melvyn; Young, Ken H.; Zensus, J. Anton; Ziurys, Lucy M.

In: Science, Vol. 350, No. 6265, 04.12.2015, p. 1242-1245.

Research output: Contribution to journalArticle

Johnson, MD, Fish, VL, Doeleman, SS, Marrone, DP, Plambeck, RL, Wardle, JFC, Akiyama, K, Asada, K, Beaudoin, C, Blackburn, L, Blundell, R, Bower, GC, Brinkerink, C, Broderick, AE, Cappallo, R, Chael, AA, Crew, GB, Dexter, J, Dexter, M, Freund, R, Friberg, P, Gold, R, Gurwell, MA, Ho, PTP, Honma, M, Inoue, M, Kosowsky, M, Krichbaum, TP, Lamb, J, Loeb, A, Lu, RS, MacMahon, D, McKinney, JC, Moran, JM, Narayan, R, Primiani, RA, Psaltis, D, Rogers, AEE, Rosenfeld, K, Hoo, JS, Tilanus, RPJ, Titus, M, Vertatschitsch, L, Weintroub, J, Wright, M, Young, KH, Zensus, JA & Ziurys, LM 2015, 'Resolved magnetic-field structure and variability near the event horizon of Sagittarius A∗', Science, vol. 350, no. 6265, pp. 1242-1245. https://doi.org/10.1126/science.aac7087
Johnson MD, Fish VL, Doeleman SS, Marrone DP, Plambeck RL, Wardle JFC et al. Resolved magnetic-field structure and variability near the event horizon of Sagittarius A∗. Science. 2015 Dec 4;350(6265):1242-1245. https://doi.org/10.1126/science.aac7087
Johnson, Michael D. ; Fish, Vincent L. ; Doeleman, Sheperd S. ; Marrone, Daniel P ; Plambeck, Richard L. ; Wardle, John F C ; Akiyama, Kazunori ; Asada, Keiichi ; Beaudoin, Christopher ; Blackburn, Lindy ; Blundell, Ray ; Bower, Geoffrey C. ; Brinkerink, Christiaan ; Broderick, Avery E. ; Cappallo, Roger ; Chael, Andrew A. ; Crew, Geoffrey B. ; Dexter, Jason ; Dexter, Matt ; Freund, Robert ; Friberg, Per ; Gold, Roman ; Gurwell, Mark A. ; Ho, Paul T P ; Honma, Mareki ; Inoue, Makoto ; Kosowsky, Michael ; Krichbaum, Thomas P. ; Lamb, James ; Loeb, Abraham ; Lu, Ru Sen ; MacMahon, David ; McKinney, Jonathan C. ; Moran, James M. ; Narayan, Ramesh ; Primiani, Rurik A. ; Psaltis, Dimitrios ; Rogers, Alan E E ; Rosenfeld, Katherine ; Hoo, Jason Soo ; Tilanus, Remo P J ; Titus, Michael ; Vertatschitsch, Laura ; Weintroub, Jonathan ; Wright, Melvyn ; Young, Ken H. ; Zensus, J. Anton ; Ziurys, Lucy M. / Resolved magnetic-field structure and variability near the event horizon of Sagittarius A∗. In: Science. 2015 ; Vol. 350, No. 6265. pp. 1242-1245.
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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 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 ∼6 Schwarzschild radii, and we have detected and localized the intrahour variability associated with these fields.",
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T1 - Resolved magnetic-field structure and variability near the event horizon of Sagittarius A∗

AU - Johnson, Michael D.

AU - Fish, Vincent L.

AU - Doeleman, Sheperd S.

AU - Marrone, Daniel P

AU - Plambeck, Richard L.

AU - Wardle, John F C

AU - Akiyama, Kazunori

AU - Asada, Keiichi

AU - Beaudoin, Christopher

AU - Blackburn, Lindy

AU - Blundell, Ray

AU - Bower, Geoffrey C.

AU - Brinkerink, Christiaan

AU - Broderick, Avery E.

AU - Cappallo, Roger

AU - Chael, Andrew A.

AU - Crew, Geoffrey B.

AU - Dexter, Jason

AU - Dexter, Matt

AU - Freund, Robert

AU - Friberg, Per

AU - Gold, Roman

AU - Gurwell, Mark A.

AU - Ho, Paul T P

AU - Honma, Mareki

AU - Inoue, Makoto

AU - Kosowsky, Michael

AU - Krichbaum, Thomas P.

AU - Lamb, James

AU - Loeb, Abraham

AU - Lu, Ru Sen

AU - MacMahon, David

AU - McKinney, Jonathan C.

AU - Moran, James M.

AU - Narayan, Ramesh

AU - Primiani, Rurik A.

AU - Psaltis, Dimitrios

AU - Rogers, Alan E E

AU - Rosenfeld, Katherine

AU - Hoo, Jason Soo

AU - Tilanus, Remo P J

AU - Titus, Michael

AU - Vertatschitsch, Laura

AU - Weintroub, Jonathan

AU - Wright, Melvyn

AU - Young, Ken H.

AU - Zensus, J. Anton

AU - Ziurys, Lucy M

PY - 2015/12/4

Y1 - 2015/12/4

N2 - 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 ∼6 Schwarzschild radii, and we have detected and localized the intrahour variability associated with these fields.

AB - 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 ∼6 Schwarzschild radii, and we have detected and localized the intrahour variability associated with these fields.

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