Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling
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...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/109549 https://orcid.org/0000-0002-9475-4254 https://orcid.org/0000-0003-0077-4367 |
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| author | Kuramochi, Kazuki Ikeda, Shiro Tazaki, Fumie Honma, Mareki E. Broderick, Avery Dexter, Jason Mościbrodzka, Monika A. Chael, Andrew Zaizen, Masamichi Akiyama, Kazunori Bouman, Katherine L Fish, Vincent L. Doeleman, Sheperd Samuel |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Kuramochi, Kazuki Ikeda, Shiro Tazaki, Fumie Honma, Mareki E. Broderick, Avery Dexter, Jason Mościbrodzka, Monika A. Chael, Andrew Zaizen, Masamichi Akiyama, Kazunori Bouman, Katherine L Fish, Vincent L. Doeleman, Sheperd Samuel |
| author_sort | Kuramochi, Kazuki |
| collection | MIT |
| description | 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 [subscript 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 [subscript 1] + TV regularization can achieve an optimal resolution of ~20%–30% of the diffraction limit λ/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*. |
| first_indexed | 2024-09-23T08:47:41Z |
| format | Article |
| id | mit-1721.1/109549 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:47:41Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1095492022-09-23T14:35:23Z Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling Kuramochi, Kazuki Ikeda, Shiro Tazaki, Fumie Honma, Mareki E. Broderick, Avery Dexter, Jason Mościbrodzka, Monika A. Chael, Andrew Zaizen, Masamichi Akiyama, Kazunori Bouman, Katherine L Fish, Vincent L. Doeleman, Sheperd Samuel Haystack Observatory Massachusetts Institute of Technology. Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Akiyama, Kazunori Bouman, Katherine L Fish, Vincent L. Doeleman, Sheperd Samuel 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 [subscript 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 [subscript 1] + TV regularization can achieve an optimal resolution of ~20%–30% of the diffraction limit λ/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*. 2017-06-02T17:30:47Z 2017-06-02T17:30:47Z 2017-03 2017-02 Article http://purl.org/eprint/type/JournalArticle 1538-4357 http://hdl.handle.net/1721.1/109549 Akiyama, Kazunori, Kazuki Kuramochi, Shiro Ikeda, Vincent L. Fish, Fumie Tazaki, Mareki Honma, Sheperd S. Doeleman, et al. “Imaging the Schwarzschild-Radius-Scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling.” The Astrophysical Journal 838, no. 1 (March 17, 2017): 1. © 2017 The American Astronomical Society https://orcid.org/0000-0002-9475-4254 https://orcid.org/0000-0003-0077-4367 en_US http://dx.doi.org/10.3847/1538-4357/aa6305 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Kuramochi, Kazuki Ikeda, Shiro Tazaki, Fumie Honma, Mareki E. Broderick, Avery Dexter, Jason Mościbrodzka, Monika A. Chael, Andrew Zaizen, Masamichi Akiyama, Kazunori Bouman, Katherine L Fish, Vincent L. Doeleman, Sheperd Samuel Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling |
| title | Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling |
| title_full | Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling |
| title_fullStr | Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling |
| title_full_unstemmed | Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling |
| title_short | Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope Using Sparse Modeling |
| title_sort | imaging the schwarzschild radius scale structure of m87 with the event horizon telescope using sparse modeling |
| url | http://hdl.handle.net/1721.1/109549 https://orcid.org/0000-0002-9475-4254 https://orcid.org/0000-0003-0077-4367 |
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