Dortmund 2021 – wissenschaftliches Programm
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AKPIK: Arbeitskreis Physik, moderne Informationstechnologie und Künstliche Intelligenz
AKPIK 1: AKPIK I: Data Science & Analytics
AKPIK 1.4: Vortrag
Dienstag, 16. März 2021, 16:45–17:00, AKPIKa
Imaging in space, time and frequency: M87* as movie — Philipp Arras1,2, Philipp Frank1, •Jakob Knollmüller2,1, Reimar Leike1, Philipp Haim1, Martin Reinecke1, and Torsten Enßlin1 — 1Max-Planck Institute for Astrophysics — 2Technical University Munich
The recent observations of the black hole shadow of M87* with Very Long Baseline Interferometry (VLBI) by the Event Horizon Telescope (EHT) open the possibility to investigate the dynamical processes right at the edge of black holes. In this regime, traditional radio-astronomical imaging algorithms are brought to their limits. Compared to regular radio interferometers, VLBI networks have fewer antennas. The resulting sparser sampling of the Fourier sky can only be partly compensated by co-adding observations from different days, as the source changes. Here, we present an imaging algorithm that copes with the data scarcity and the source's temporal evolution, while simultaneously providing uncertainty quantification on all results. Our algorithm views the imaging task as a Bayesian inference problem of a time-varying flux density, exploits the correlation structure between time frames, and reconstructs a whole, 2+1+1 dimensional time-variable and spectral-resolved image at once. (https://arxiv.org/abs/2002.05218)