Journal
ASTROPHYSICAL JOURNAL
Volume 838, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa6305
Keywords
accretion, accretion disks; black hole physics; Galaxy: center; submillimeter: general; techniques: interferometric
Categories
Funding
- program of Postdoctoral Fellowships for Research Abroad at the Japan Society for the Promotion of Science
- Perimeter Institute for Theoretical Physics
- Natural Sciences and Engineering Research Council of Canada through a Discovery Grant
- ERC Synergy [610058]
- National Science Foundation (NSF) [AST-1440254, AST-1614868]
- Gordon and Betty Moore Foundation [GMBF-3561]
- MEXT/JSPS KAKENHI [24540242, 25120007, 25120008]
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Innovation
- Russian Science Foundation [17-12-01029] Funding Source: Russian Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1614868] Funding Source: National Science Foundation
- National Research Council of Science & Technology (NST), Republic of Korea [2019184100] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1A5A1013277] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We propose a new imaging technique for radio and optical/infrared interferometry. The proposed technique reconstructs the image from the visibility amplitude and closure phase, which are standard data products of short-millimeter very long baseline interferometers such as the Event Horizon Telescope (EHT) and optical/infrared interferometers, by utilizing two regularization functions: the l(1)-norm and total variation (TV) of the brightness distribution. In the proposed method, optimal regularization parameters, which represent the sparseness and effective spatial resolution of the image, are derived from data themselves using cross-validation (CV). As an application of this technique, we present simulated observations of M87 with the EHT based on four physically motivated models. We confirm that l(1) + TV regularization can achieve an optimal resolution of similar to 20%-30% of the diffraction limit lambda/D-max, which is the nominal spatial resolution of a radio interferometer. With the proposed technique, the EHT can robustly and reasonably achieve super-resolution sufficient to clearly resolve the black hole shadow. These results make it promising for the EHT to provide an unprecedented view of the event-horizon-scale structure in the vicinity of the supermassive black hole in M87 and also the Galactic center Sgr A*.
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