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Abstract:
Centaurus A is the closest radio galaxy to Earth and has been studied
extensively as a laboratory for AGN feedback and potential UHECR
source after its discovery as one of the first extragalactic radio
sources in 1949. I will present the results from our EHT observations
of this southern source. Compared to previous VLBI studies, we have
imaged the AGN jet of Cen A at a 16x sharper resolution and 10x higher
observing frequency. This allows us to probe the launching region of
an extragalactic radio jet on sub-lightday scales. We can directly
compare our image to VLBI observations of M87 at a lower frequency, as
both probe the same size scales in terms of gravitational radii. Based
on the similarity of these jets, we show that our observations provide
further support for the fundamental plane of black hole activity in an
intermediate mass regime. From the location of the resolved radio core
in Cen A, we predict the source's black hole shadow to be visible at
THz frequencies, which marks Cen A for future high-frequency space VLBI
missions. I will conclude with an outlook of our next observational
and modeling steps.
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