TY - JOUR
A1 - Joseph Farah
A1 - Peter Galison
A1 - Kazunori Akiyama
A1 - Katherine L. Bouman
A1 - Geoffrey C. Bower
A1 - Andrew Chael
A1 - Antonio Fuentes
A1 - José L. Gómez
A1 - Mareki Honma
A1 - Michael D. Johnson
A1 - Yutaro Kofuji
A1 - Daniel P. Marrone
A1 - Kotaro Moriyama
A1 - Ramesh Narayan
A1 - Dominic W. Pesce
A1 - Paul Tiede
A1 - Maciek Wielgus
A1 - Guang-Yao Zhao
A1 - The Event Horizon Telescope Collaboration
AB - Recent developments in very long baseline interferometry (VLBI) have made it possible for the Event Horizon Telescope (EHT) to resolve the innermost accretion flows of the largest supermassive black holes on the sky. The sparse nature of the EHT's (u, v)-coverage presents a challenge when attempting to resolve highly time-variable sources. We demonstrate that the changing (u, v)-coverage of the EHT can contain regions of time over the course of a single observation that facilitate dynamical imaging. These optimal time regions typically have projected baseline distributions that are approximately angularly isotropic and radially homogeneous. We derive a metric of coverage quality based on baseline isotropy and density that is capable of ranking array configurations by their ability to produce accurate dynamical reconstructions. We compare this metric to existing metrics in the literature and investigate their utility by performing dynamical reconstructions on synthetic data from simulated EHT observations of sources with simple orbital variability. We then use these results to make recommendations for imaging the 2017 EHT Sgr A* data set.
AU - 
BT - The Astrophysical Journal Letters
IS - L18
LA - eng
N2 - Recent developments in very long baseline interferometry (VLBI) have made it possible for the Event Horizon Telescope (EHT) to resolve the innermost accretion flows of the largest supermassive black holes on the sky. The sparse nature of the EHT's (u, v)-coverage presents a challenge when attempting to resolve highly time-variable sources. We demonstrate that the changing (u, v)-coverage of the EHT can contain regions of time over the course of a single observation that facilitate dynamical imaging. These optimal time regions typically have projected baseline distributions that are approximately angularly isotropic and radially homogeneous. We derive a metric of coverage quality based on baseline isotropy and density that is capable of ranking array configurations by their ability to produce accurate dynamical reconstructions. We compare this metric to existing metrics in the literature and investigate their utility by performing dynamical reconstructions on synthetic data from simulated EHT observations of sources with simple orbital variability. We then use these results to make recommendations for imaging the 2017 EHT Sgr A* data set.
PY - 2022
SP - 1
EP - 21
T1 - Selective Dynamical Imaging of Interferometric Data
T2 - The Astrophysical Journal Letters
TI - Selective Dynamical Imaging of Interferometric Data
UR - https://doi.org/10.3847/2041-8213/ac6615
VL - 930
Y1 - 2022
ER -