作者
Kazunori Akiyama, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Keiichi Asada, Rebecca Azulay, Uwe Bach, Anne-Kathrin Baczko, David Ball, Mislav Baloković, John Barrett, Michi Bauböck, Bradford A Benson, Dan Bintley, Lindy Blackburn, Raymond Blundell, Katherine L Bouman, Geoffrey C Bower, Hope Boyce, Michael Bremer, Christiaan D Brinkerink, Roger Brissenden, Silke Britzen, Avery E Broderick, Dominique Broguiere, Thomas Bronzwaer, Sandra Bustamante, Do-Young Byun, John E Carlstrom, Chiara Ceccobello, Andrew Chael, Chi-kwan Chan, Koushik Chatterjee, Shami Chatterjee, Ming-Tang Chen, Yongjun Chen, Xiaopeng Cheng, Ilje Cho, Pierre Christian, Nicholas S Conroy, John E Conway, James M Cordes, Thomas M Crawford, Geoffrey B Crew, Alejandro Cruz-Osorio, Yuzhu Cui, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Vedant Dhruv, Sheperd S Doeleman, Sean Dougal, Sergio A Dzib, Ralph P Eatough, Razieh Emami, Heino Falcke, Joseph Farah, Vincent L Fish, Ed Fomalont, H Alyson Ford, Raquel Fraga-Encinas, William T Freeman, Per Friberg, Christian M Fromm, Antonio Fuentes, Peter Galison, Charles F Gammie, Roberto García, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi, Roman Gold, Arturo I Gómez-Ruiz, José L Gómez, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Daryl Haggard, Kari Haworth, Michael H Hecht, Ronald Hesper, Dirk Heumann, Luis C Ho, Paul Ho, Mareki Honma, Chih-Wei L Huang, Lei Huang, David H Hughes, Shiro Ikeda, CM Violette Impellizzeri, Makoto Inoue, Sara Issaoun, David J James, Buell T Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Michael D Johnson, Svetlana Jorstad, Abhishek V Joshi, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K Keating, Mark Kettenis, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kim, Motoki Kino, Jun Yi Koay, Prashant Kocherlakota, Yutaro Kofuji, Patrick M Koch, Shoko Koyama, Carsten Kramer, Michael Kramer, Thomas P Krichbaum, Cheng-Yu Kuo, Noemi La Bella, Tod R Lauer, Daeyoung Lee, Sang-Sung Lee, Po Kin Leung, Aviad Levis, Zhiyuan Li, Rocco Lico, Greg Lindahl, Michael Lindqvist, Mikhail Lisakov, Jun Liu, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P Lobanov, Laurent Loinard, Colin J Lonsdale, Ru-Sen Lu, Jirong Mao, Nicola Marchili, Sera Markoff, Daniel P Marrone, Alan P Marscher, Iván Martí-Vidal
发表日期
2022/5/12
期刊
The Astrophysical Journal Letters
卷号
930
期号
2
页码范围
L15
出版商
IOP Publishing
简介
In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017 April at a wavelength of 1.3 mm. We find that the Sgr A* data exhibit variability that exceeds what can be explained by the uncertainties in the data or by the effects of interstellar scattering. The magnitude of this variability can be a substantial fraction of the correlated flux density, reaching∼ 100% on some baselines. Through an exploration of simple geometric source models, we demonstrate that ringlike morphologies provide better fits to the Sgr A* data than do other morphologies with comparable complexity. We develop two strategies for fitting static geometric ring models to the time-variable Sgr A* data; one strategy fits models to short segments of data over which the source is static and averages these independent fits, while the other fits models to the full data set …
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K Akiyama, A Alberdi, W Alef, JC Algaba, R Anantua… - The Astrophysical Journal Letters, 2022