Speaker
Maciek Wielgus
(Black Hole Initiative, Harvard)
Description
We report on a first detection of an orbiting hot spot in ALMA polarimetric light curves of Sagittarius A*, manifesting in the loop-like patterns on the linear polarization Q-U plane following the X-ray flare detected by Chandra. The observed hot spot period corresponds to about 70 minutes, and the implied orbital radius corresponds to about 5 Schwarzschild radii. These new observations constrain magnetic field to be predominantly vertical and the viewing angle of the hot spot orbit to be close to face-on. We discuss the impact of black hole spin, hot spot motion Keplerianity, and other model parameters on the interpretation of these results.
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Primary authors
Maciek Wielgus
(Black Hole Initiative, Harvard)
Prof.
Monika Moscibrodzka
(Radboud University)
Mr
Jesse Vos
(Radboud University)
Mr
Zachary Gelles
(Princeton University)
Prof.
Ivan Marti-Vidal
(University of Valencia)