(Online Colloquium) - Event Horizon Telescope imaging of the archetypal blazar 3C 279 at an extreme 20 microarcsecond resolution

Informal Colloquium
Dr. Jae-Young Kim
SCHEDULED
MPI für Radioastronomie

Talk held remotely per videoconference, please use link https://zoom.us/j/361948562 3C 279 is an archetypal blazar with a prominent radio jet and shows broadband flux density variability across the entire electromagnetic spectrum. There is ample observational evidence that the variable emission, which changes even on ~5 minutes timescales, originates from the the ultra-compact nucleus of the jet. While previous ground-based very long baseline interferometry (VLBI) observations at cm-wavelengths characterized the structure and dynamics of the jet on parsec (milliarcsecond) scales, the limited angular resolution did not allow a direct view into the microarcsecond-scale fine structures within the cm-VLBI core. In this talk, I will show results from recent Event Horizon Telescope (EHT) observations of 3C 279 at 230 GHz. The source was observed during four days in April 2017, along with M87, at a record angular resolution of ~20 microarcseconds (~0.13 pc ~1700 Schwarzschild radii spatial resolution). Main results including the highest resolution images and complex dynamics of the ultracompact jet, and their physical interpretations will be presented.

TBD

Main Colloquium
Dr. Victoria Grinberg
CANCELED
Universität Tübingen

TBD