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Astronomy Colloquium - "Event horizon scale magnetic fields from polarized black hole images"

Event Type
Seminar/Symposium
Sponsor
Department of Astronomy
Virtual
wifi event
Date
Apr 27, 2021   3:45 pm  
Speaker
Dr. Jason Dexter, University of Colorado
Contact
Rebecca Bare
E-Mail
rsbare@illinois.edu
Phone
217-265-8226
Views
14
Originating Calendar
Astronomy Colloquium Speaker Calendar

Magnetic fields have long been thought to play key roles in driving accretion onto black holes and launching their relativistic jets. I will present spatially resolved long-baseline interferometry observations of linearly polarized synchrotron radiation from near the event horizons of two weakly accreting supermassive black holes, Sgr A* and M87. I will show how the data can be used to infer properties of the radiating plasma, and map the magnetic field structure. The data imply the presence of dynamically important magnetic fields in the emission region in both cases, which can alter the structure of the accretion flow and launch powerful jets.

Topic: Astronomy Colloquium (SP2021)
Time: This is a recurring meeting Meet anytime

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