A1 Refereed original research article in a scientific journal
The Event Horizon Telescope Image of the Quasar NRAO 530
Authors: Jorstad Svetlana, Wielgus Maciek, Lico Rocco, Issaoun Sara, Broderick Avery E., Pesce Dominic W., Liu Jun, Zhao Guang-Yao, Krichbaum Thomas P., Blackburn Lindy, Chan Chi-kwan, Janssen Michael, Ramakrishnan Venkatessh, Akiyama Kazunori, Alberdi Antxon, Algaba Juan Carlos, Bouman Katherine L., Cho Ilje, Fuentes Antonio, Gómez José L., Gurwell Mark, Johnson Michael D., Kim Jae-Young, Lu Ru-Sen, Martí-Vidal Iván, Moscibrodzka Monika, Pötzl Felix M., Traianou Efthalia, van Bemmel Ilse, Alef Walter, Anantua Richard, Asada Keiichi, Azulay Rebecca, Bach Uwe, Baczko Anne-Kathrin, Ball David, Baloković Mislav, Barrett John, Bauböck Michi, Benson Bradford A., Bintley Dan, Blundell Raymond, Bower Geoffrey C., Boyce Hope, Bremer Michael, Brinkerink Christiaan D., Brissenden Roger, Britzen Silke, Broguiere Dominique, Bronzwaer Thomas, Bustamante Sandra, Byun Do-Young, Carlstrom John E., Ceccobello Chiara, Chael Andrew, Chatterjee Koushik, Chatterjee Shami, Chen Ming-Tang, Chen Yongjun, Cheng Xiaopeng, Christian Pierre, Conroy Nicholas S., Conway John E., Cordes James M., Crawford Thomas M., Crew Geoffrey B., Cruz-Osorio Alejandro, Cui Yuzhu, Davelaar Jordy, De Laurentis Mariafelicia, Deane Roger, Dempsey Jessica, Desvignes Gregory, Dexter Jason, Dhruv Vedant, Doeleman Sheperd S., Dougal Sean, Dzib Sergio A., Eatough Ralph P., Emami Razieh, Falcke Heino, Farah Joseph, Fish Vincent L., Fomalont Ed, Ford H. Alyson, Fraga-Encinas Raquel, Freeman William T., Friberg Per, Fromm Christian M., Galison Peter, Gammie Charles F., García Roberto, Gentaz Olivier, Georgiev Boris, Goddi Ciriaco, Gold Roman, Gómez-Ruiz Arturo I., Gu Minfeng, Hada Kazuhiro, Haggard Daryl, Haworth Kari, Hecht Michael H., Hesper Ronald, Heumann Dirk, Ho Luis C., Ho Paul, Honma Mareki, Huang Chih-Wei L., Huang Lei, Hughes David H., Ikeda Shiro, Impellizzeri C.M. Violette, Inoue Makoto, James David J., Jannuzi Buell T., Jeter Britton, Jiang Wu, Jiménez-Rosales Alejandra, Joshi Abhishek V., Jung Taehyun, Karami Mansour, Karuppusamy Ramesh, Kawashima Tomohisa, Keating Garrett K., Kettenis Mark, Kim Dong-Jin, Kim Jongsoo, Kim Junhan, Kino Motoki, Koay Jun Yi, Kocherlakota Prashant, Kofuji Yutaro, Koyama Shoko, Kramer Carsten, Kramer Michael, Kuo Cheng-Yu, La Bella Noemi, Lauer Tod R., Lee Daeyoung, Lee Sang-Sung, Leung Po Kin, Levis Aviad, Li Zhiyuan, Lindahl Greg, Lindqvist Michael, Lisakov Mikhail, Liu Kuo, Liuzzo Elisabetta, Lo Wen-Ping, Lobanov Andrei P., Loinard Laurent, Lonsdale Colin J., MacDonald Nicholas R., Mao Jirong, Marchili Nicola, Markoff Sera, Marrone Daniel P., Marscher Alan P., Matsushita Satoki, Matthews Lynn D., Medeiros Lia, Menten Karl M., Michalik Daniel, Mizuno Izumi, Mizuno Yosuke, Moran James M., Moriyama Kotaro, Müller Cornelia, Mus Alejandro, Musoke Gibwa, Myserlis Ioannis, Nadolski Andrew, Nagai Hiroshi, Nagar Neil M., Nakamura Masanori, Narayan Ramesh, Narayanan Gopal, Natarajan Iniyan, Nathanail Antonios, Fuentes Santiago Navarro, Neilsen Joey, Neri Roberto, Ni Chunchong, Noutsos Aristeidis, Nowak Michael A., Oh Junghwan, Okino Hiroki, Olivares Héctor, Ortiz-León Gisela N., Oyama Tomoaki, Özel Feryal, Palumbo Daniel C.M., Paraschos Georgios Filippos, Park Jongho, Parsons Harriet, Patel Nimesh, Pen Ue-Li, Piétu Vincent, Plambeck Richard, PopStefanija Aleksandar, Porth Oliver, Prather Ben, Preciado-López Jorge A., Psaltis Dimitrios, Pu Hung-Yi, Rao Ramprasad, Rawlings Mark G., Raymond Alexander W., Rezzolla Luciano, Ricarte Angelo, Ripperda Bart, Roelofs Freek, Rogers Alan, Ros Eduardo, Romero-Cañizales Cristina, Roshanineshat Arash, Rottmann Helge, Roy Alan L., Ruiz Ignacio, Ruszczyk Chet, Rygl Kazi L.J., Sánchez Salvador, Sánchez-Argüelles David, Sánchez-Portal Miguel, Sasada Mahito, Satapathy Kaushik, Savolainen Tuomas, Schloerb F. Peter, Schonfeld Jonathan, Schuster Karl-Friedrich, Shao Lijing, Shen Zhiqiang, Small Des, Sohn Bong Won, SooHoo Jason, Souccar Kamal, Sun He, Tazaki Fumie, Tetarenko Alexandra J., Tiede Paul, Tilanus Remo P.J., Titus Michael, Torne Pablo, Trent Tyler, Trippe Sascha, Turk Matthew, van Langevelde Huib Jan, van Rossum Daniel R., Vos Jesse, Wagner Jan, Ward-Thompson Derek, Wardle John, Weintroub Jonathan, Wex Norbert, Wharton Robert, Wiik Kaj, Witzel Gunther, Wondrak Michael F., Wong George N., Wu Qingwen, Yamaguchi Paul, Yoon Doosoo, Young André, Young Ken, Younsi Ziri, Yuan Feng, Yuan Ye-Fei, Zensus J. Anton, Zhang Shuo, Zhao Shan-Shan
Publisher: Institute of Physics
Publication year: 2023
Journal: Astrophysical Journal
Journal name in source: Astrophysical Journal
Article number: 170
Volume: 943
Issue: 2
ISSN: 0004-637X
eISSN: 1538-4357
DOI: https://doi.org/10.3847/1538-4357/acaea8
Web address : https://doi.org/10.3847/1538-4357/acaea8
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/179123525
We report on the observations of the quasar NRAO 530 with the Event Horizon Telescope (EHT) on 2017 April 5−7, when NRAO 530 was used as a calibrator for the EHT observations of Sagittarius A*. At z = 0.902, this is the most distant object imaged by the EHT so far. We reconstruct the first images of the source at 230 GHz, at an unprecedented angular resolution of ∼20 μas, both in total intensity and in linear polarization (LP). We do not detect source variability, allowing us to represent the whole data set with static images. The images reveal a bright feature located on the southern end of the jet, which we associate with the core. The feature is linearly polarized, with a fractional polarization of ∼5%–8%, and it has a substructure consisting of two components. Their observed brightness temperature suggests that the energy density of the jet is dominated by the magnetic field. The jet extends over 60 μas along a position angle ∼ −28°. It includes two features with orthogonal directions of polarization (electric vector position angle), parallel and perpendicular to the jet axis, consistent with a helical structure of the magnetic field in the jet. The outermost feature has a particularly high degree of LP, suggestive of a nearly uniform magnetic field. Future EHT observations will probe the variability of the jet structure on microarcsecond scales, while simultaneous multiwavelength monitoring will provide insight into the high-energy emission origin.
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