Abstract
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.
| Original language | English |
|---|---|
| Article number | 170 |
| Journal | Astrophysical Journal |
| Volume | 943 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2023 Feb 1 |
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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In: Astrophysical Journal, Vol. 943, No. 2, 170, 01.02.2023.
Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - The Event Horizon Telescope Image of the Quasar NRAO 530
AU - Jorstad, Svetlana
AU - Wielgus, Maciek
AU - Lico, Rocco
AU - Issaoun, Sara
AU - Broderick, Avery E.
AU - Pesce, Dominic W.
AU - Liu, Jun
AU - Zhao, Guang Yao
AU - Krichbaum, Thomas P.
AU - Blackburn, Lindy
AU - Chan, Chi Kwan
AU - Janssen, Michael
AU - Ramakrishnan, Venkatessh
AU - Akiyama, Kazunori
AU - Alberdi, Antxon
AU - Algaba, Juan Carlos
AU - Bouman, Katherine L.
AU - Cho, Ilje
AU - Fuentes, Antonio
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AU - Gurwell, Mark
AU - Johnson, Michael D.
AU - Kim, Jae Young
AU - Lu, Ru Sen
AU - Martí-Vidal, Iván
AU - Moscibrodzka, Monika
AU - Pötzl, Felix M.
AU - Traianou, Efthalia
AU - van Bemmel, Ilse
AU - Alef, Walter
AU - Anantua, Richard
AU - Asada, Keiichi
AU - Azulay, Rebecca
AU - Bach, Uwe
AU - Baczko, Anne Kathrin
AU - Ball, David
AU - Baloković, Mislav
AU - Barrett, John
AU - Bauböck, Michi
AU - Benson, Bradford A.
AU - Bintley, Dan
AU - Blundell, Raymond
AU - Bower, Geoffrey C.
AU - Boyce, Hope
AU - Bremer, Michael
AU - Brinkerink, Christiaan D.
AU - Brissenden, Roger
AU - Britzen, Silke
AU - Broguiere, Dominique
AU - Bronzwaer, Thomas
AU - Bustamante, Sandra
AU - Byun, Do Young
AU - Carlstrom, John E.
AU - Ceccobello, Chiara
AU - Chael, Andrew
AU - Chatterjee, Koushik
AU - Chatterjee, Shami
AU - Chen, Ming Tang
AU - Chen, Yongjun
AU - Cheng, Xiaopeng
AU - Christian, Pierre
AU - Conroy, Nicholas S.
AU - Conway, John E.
AU - Cordes, James M.
AU - Crawford, Thomas M.
AU - Crew, Geoffrey B.
AU - Cruz-Osorio, Alejandro
AU - Cui, Yuzhu
AU - Davelaar, Jordy
AU - De Laurentis, Mariafelicia
AU - Deane, Roger
AU - Dempsey, Jessica
AU - Desvignes, Gregory
AU - Dexter, Jason
AU - Dhruv, Vedant
AU - Doeleman, Sheperd S.
AU - Dougal, Sean
AU - Dzib, Sergio A.
AU - Eatough, Ralph P.
AU - Emami, Razieh
AU - Falcke, Heino
AU - Farah, Joseph
AU - Fish, Vincent L.
AU - Fomalont, Ed
AU - Ford, H. Alyson
AU - Fraga-Encinas, Raquel
AU - Freeman, William T.
AU - Friberg, Per
AU - Fromm, Christian M.
AU - Galison, Peter
AU - Gammie, Charles F.
AU - García, Roberto
AU - Gentaz, Olivier
AU - Georgiev, Boris
AU - Goddi, Ciriaco
AU - Gold, Roman
AU - Gómez-Ruiz, Arturo I.
AU - Gu, Minfeng
AU - Hada, Kazuhiro
AU - Haggard, Daryl
AU - Haworth, Kari
AU - Hecht, Michael H.
AU - Hesper, Ronald
AU - Heumann, Dirk
AU - Ho, Luis C.
AU - Ho, Paul
AU - Honma, Mareki
AU - Huang, Chih Wei L.
AU - Huang, Lei
AU - Hughes, David H.
AU - Ikeda, Shiro
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AU - Inoue, Makoto
AU - James, David J.
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AU - Jeter, Britton
AU - Jiang, Wu
AU - Jiménez-Rosales, Alejandra
AU - Joshi, Abhishek V.
AU - Jung, Taehyun
AU - Karami, Mansour
AU - Karuppusamy, Ramesh
AU - Kawashima, Tomohisa
AU - Keating, Garrett K.
AU - Kettenis, Mark
AU - Kim, Dong Jin
AU - Kim, Jongsoo
AU - Kim, Junhan
AU - Kino, Motoki
AU - Koay, Jun Yi
AU - Kocherlakota, Prashant
AU - Kofuji, Yutaro
AU - Koyama, Shoko
AU - Kramer, Michael
AU - Kuo, Cheng Yu
AU - Kramer, Carsten
AU - Bella, Noemi La
AU - Lauer, Tod R.
AU - Lee, Daeyoung
AU - Lee, Sang Sung
AU - Leung, Po Kin
AU - Levis, Aviad
AU - Li, Zhiyuan
AU - Lindahl, Greg
AU - Lindqvist, Michael
AU - Lisakov, Mikhail
AU - Liu, Kuo
AU - Liuzzo, Elisabetta
AU - Lo, Wen Ping
AU - Lobanov, Andrei P.
AU - Loinard, Laurent
AU - Lonsdale, Colin J.
AU - MacDonald, Nicholas R.
AU - Mao, Jirong
AU - Marchili, Nicola
AU - Markoff, Sera
AU - Marrone, Daniel P.
AU - Marscher, Alan P.
AU - Matsushita, Satoki
AU - Matthews, Lynn D.
AU - Medeiros, Lia
AU - Menten, Karl M.
AU - Michalik, Daniel
AU - Mizuno, Izumi
AU - Mizuno, Yosuke
AU - Moran, James M.
AU - Moriyama, Kotaro
AU - Müller, Cornelia
AU - Mus, Alejandro
AU - Musoke, Gibwa
AU - Myserlis, Ioannis
AU - Nadolski, Andrew
AU - Nagai, Hiroshi
AU - Nagar, Neil M.
AU - Nakamura, Masanori
AU - Narayan, Ramesh
AU - Narayanan, Gopal
AU - Natarajan, Iniyan
AU - Nathanail, Antonios
AU - Fuentes, Santiago Navarro
AU - Neilsen, Joey
AU - Neri, Roberto
AU - Ni, Chunchong
AU - Noutsos, Aristeidis
AU - Nowak, Michael A.
AU - Oh, Junghwan
AU - Okino, Hiroki
AU - Olivares, Héctor
AU - Ortiz-León, Gisela N.
AU - Oyama, Tomoaki
AU - Özel, Feryal
AU - Palumbo, Daniel C.M.
AU - Paraschos, Georgios Filippos
AU - Park, Jongho
AU - Parsons, Harriet
AU - Patel, Nimesh
AU - Pen, Ue Li
AU - Piétu, Vincent
AU - Plambeck, Richard
AU - PopStefanija, Aleksandar
AU - Porth, Oliver
AU - Prather, Ben
AU - Preciado-López, Jorge A.
AU - Psaltis, Dimitrios
AU - Pu, Hung Yi
AU - Rao, Ramprasad
AU - Rawlings, Mark G.
AU - Raymond, Alexander W.
AU - Rezzolla, Luciano
AU - Ricarte, Angelo
AU - Ripperda, Bart
AU - Roelofs, Freek
AU - Rogers, Alan
AU - Ros, Eduardo
AU - Romero-Cañizales, Cristina
AU - Roshanineshat, Arash
AU - Rottmann, Helge
AU - Roy, Alan L.
AU - Ruiz, Ignacio
AU - Ruszczyk, Chet
AU - Rygl, Kazi L.J.
AU - Sánchez, Salvador
AU - Sánchez-Argüelles, David
AU - Sánchez-Portal, Miguel
AU - Sasada, Mahito
AU - Satapathy, Kaushik
AU - Savolainen, Tuomas
AU - Schloerb, F. Peter
AU - Schonfeld, Jonathan
AU - Schuster, Karl Friedrich
AU - Shao, Lijing
AU - Shen, Zhiqiang
AU - Small, Des
AU - Sohn, Bong Won
AU - SooHoo, Jason
AU - Souccar, Kamal
AU - Sun, He
AU - Tazaki, Fumie
AU - Tetarenko, Alexandra J.
AU - Tiede, Paul
AU - Tilanus, Remo P.J.
AU - Titus, Michael
AU - Torne, Pablo
AU - Trent, Tyler
AU - Trippe, Sascha
AU - Turk, Matthew
AU - van Langevelde, Huib Jan
AU - van Rossum, Daniel R.
AU - Vos, Jesse
AU - Wagner, Jan
AU - Ward-Thompson, Derek
AU - Wardle, John
AU - Weintroub, Jonathan
AU - Wex, Norbert
AU - Wharton, Robert
AU - Wiik, Kaj
AU - Witzel, Gunther
AU - Wondrak, Michael F.
AU - Wong, George N.
AU - Wu, Qingwen
AU - Yamaguchi, Paul
AU - Yoon, Doosoo
AU - Young, André
AU - Young, Ken
AU - Younsi, Ziri
AU - Yuan, Feng
AU - Yuan, Ye Fei
AU - Zensus, J. Anton
AU - Zhang, Shuo
AU - Zhao, Shan Shan
N1 - Publisher Copyright: © 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/2/1
Y1 - 2023/2/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85147804420&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85147804420&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/acaea8
DO - 10.3847/1538-4357/acaea8
M3 - Article
AN - SCOPUS:85147804420
SN - 0004-637X
VL - 943
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 170
ER -