Resolving Horizon-Scale Dynamics of Sagittarius A*
Abstract
Sagittarius A* (Sgr A*), the supermassive black hole at the heart of our galaxy, provides unique opportunities to study black hole accretion, jet formation, and gravitational physics. The rapid structural changes in Sgr A*'s emission pose a significant challenge for traditional imaging techniques. We present dynamic reconstructions of Sgr A* using Event Horizon Telescope (EHT) data from April 6th and 7th, 2017, analyzed with a one-minute temporal resolution with the Resolve framework. This Bayesian approach employs adaptive Gaussian Processes and Variational Inference for data-driven self-regularization. Our results not only fully confirm the initial findings by the EHT Collaboration for a time-averaged source but also reveal intricate details about the temporal dynamics within the black hole environment. We find an intriguing dynamic feature on April 6th that propagates in a clock-wise direction. Geometric modelling with ray-tracing, although not fully conclusive, indicates compatibility with high-inclination configurations of about , as seen in other studies.
Cite
@article{arxiv.2310.16889,
title = {Resolving Horizon-Scale Dynamics of Sagittarius A*},
author = {Jakob Knollmüller and Philipp Arras and Torsten Enßlin},
journal= {arXiv preprint arXiv:2310.16889},
year = {2023}
}