Event Horizon Telescope observations of the jet launching and collimation in Centaurus A
Michael Janssen, Heino Falcke, Matthias Kadler, Eduardo Ros, Maciek, Wielgus, Kazunori Akiyama, Mislav Balokovi\'c, Lindy Blackburn, Katherine L., Bouman, Andrew Chael, Chi-kwan Chan, Koushik Chatterjee, Jordy Davelaar,, Philip G. Edwards, Christian M. Fromm, Jos\'e L. G\'omez

TL;DR
This paper presents the first millimeter VLBI image of Centaurus A's jet at 228GHz, revealing detailed jet structure and SMBH location, supporting black hole scale invariance and advancing understanding of jet launching regions.
Contribution
The study provides the first high-resolution millimeter VLBI image of Centaurus A, revealing jet structure and SMBH position at unprecedented scales, bridging observational gaps.
Findings
Revealed a highly-collimated, edge-brightened jet and counterjet.
Identified the SMBH location relative to the jet core.
Supported the universality of black hole scale invariance.
Abstract
Very-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimeter wavelengths have the power to reveal the launching and initial collimation region of extragalactic radio jets, down to gravitational radii () scales in nearby sources. Centaurus A is the closest radio-loud source to Earth. It bridges the gap in mass and accretion rate between the supermassive black holes (SMBHs) in Messier 87 and our galactic center. A large southern declination of has however prevented VLBI imaging of Centaurus A below cm thus far. Here, we show the millimeter VLBI image of the source, which we obtained with the Event Horizon Telescope at GHz. Compared to previous observations, we image Centaurus A's jet at a tenfold higher frequency and sixteen times sharper resolution and thereby probe sub-lightday structures. We reveal a…
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