Visit ASIAA Homepage Registration Deadline: February 15, 2016 (Taiwan Time)
M87 Workshop: Towards the 100th Anniversary of the Discovery of Cosmic Jets
May 23(Mon)-27(Fri), 2016
Taipei, Taiwan

Oral Presentation

Resolving Magnetic Fields at the Event Horizon of a Black Hole

Author(s): Michael Johnson

Presenter: Michael Johnson (Smithsonian Astrophysical Observatory)

Magnetic fields play a central role in the accretion, emission, and outflow near black holes but have never been directly observed in this region. Yet, because linear polarization of the bright synchrotron emission from galactic cores traces these magnetic fields, polarimetric interferometry with the Event Horizon Telescope (EHT) is capable of imaging these near-horizon fields. I will present EHT observations of the Galactic Center supermassive black hole, Sgr A*. These observations, the first to resolve the polarized emission from Sgr A* at any wavelength, revealed ordered magnetic fields with vigorous activity near the event horizon. I will discuss the emerging capabilities of the EHT to study turbulence driven by the magnetorotational instability, the role of magnetic fields in jet launching, and signatures of magnetically-dominant regions near supermassive black holes.

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