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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.