@article{f56227e4375d44a1b000bcb18003cc75,
title = "Selective Dynamical Imaging of Interferometric Data",
abstract = "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.",
author = "{The Event Horizon Telescope Collaboration} and Joseph Farah and Peter Galison and Kazunori Akiyama and Bouman, {Katherine L.} and Bower, {Geoffrey C.} and Andrew Chael and Antonio Fuentes and G{\'o}mez, {Jos{\'e} L.} and Mareki Honma and Johnson, {Michael D.} and Yutaro Kofuji and Marrone, {Daniel P.} and Kotaro Moriyama and Ramesh Narayan and Pesce, {Dominic W.} and Paul Tiede and Maciek Wielgus and Zhao, {Guang Yao} and Antxon Alberdi and Walter Alef and Algaba, {Juan Carlos} and Richard Anantua and Keiichi Asada and Rebecca Azulay and Baczko, {Anne Kathrin} and David Ball and Mislav Balokovi{\'c} and John Barrett and Benson, {Bradford A.} and Dan Bintley and Lindy Blackburn and Raymond Blundell and Wilfred Boland and Hope Boyce and Michael Bremer and Brinkerink, {Christiaan D.} and Roger Brissenden and Silke Britzen and Broderick, {Avery E.} and Dominique Broguiere and Thomas Bronzwaer and Sandra Bustamente and Byun, {Do Young} and Carlstrom, {John E.} and Chan, {Chi Kwan} and Koushik Chatterjee and Shami Chatterjee and Chen, {Ming Tang} and Yongjun Chen and Kim, {Jae Young}",
note = "Publisher Copyright: {\textcopyright} 2022. The Author(s)",
year = "2022",
month = may,
day = "1",
doi = "10.3847/2041-8213/ac6615",
language = "English",
volume = "930",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "American Astronomical Society",
number = "2",
}