Abstract
The blazar J1924–2914 is a primary Event Horizon Telescope (EHT) calibrator for the Galactic center’s black hole Sagittarius A*. Here we present the first total and linearly polarized intensity images of this source obtained with the unprecedented 20 µas resolution of the EHT. J1924–2914 is a very compact flat-spectrum radio source with strong optical variability and polarization. In April 2017 the source was observed quasi-simultaneously with the EHT (April 5–11), the Global Millimeter VLBI Array (April 3), and the Very Long Baseline Array (April 28), giving a novel view of the source at four observing frequencies, 230, 86, 8.7, and 2.3 GHz. These observations probe jet properties from the subparsec to 100 pc scales. We combine the multifrequency images of J1924–2914 to study the source morphology. We find that the jet exhibits a characteristic bending, with a gradual clockwise rotation of the jet projected position angle of about 90° between 2.3 and 230 GHz. Linearly polarized intensity images of J1924–2914 with the extremely fine resolution of the EHT provide evidence for ordered toroidal magnetic fields in the blazar compact core.
Original language | English (US) |
---|---|
Article number | 145 |
Journal | Astrophysical Journal |
Volume | 934 |
Issue number | 2 |
DOIs | |
State | Published - Aug 1 2022 |
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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In: Astrophysical Journal, Vol. 934, No. 2, 145, 01.08.2022.
Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Resolving the Inner Parsec of the Blazar J1924–2914 with the Event Horizon Telescope
AU - Issaoun, Sara
AU - Wielgus, Maciek
AU - Jorstad, Svetlana
AU - Krichbaum, Thomas P.
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AU - Ceccobello, Chiara
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AU - Chen, Ming Tang
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AU - Haggard, Daryl
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AU - Ho, Luis C.
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AU - Lindahl, Greg
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AU - Liuzzo, Elisabetta
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AU - Marchili, Nicola
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AU - Müller, Cornelia
AU - Mus, Alejandro
AU - Musoke, Gibwa
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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 - Neilsen, Joey
AU - Neri, Roberto
AU - Ni, Chunchong
AU - Noutsos, Aristeidis
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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 - Pötzl, Felix M.
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 - Rogers, Alan
AU - Ros, Eduardo
AU - Romero-Canizales, Cristina
AU - Roshanineshat, Arash
AU - Rottmann, Helge
AU - Roy, Alan L.
AU - Roelofs, Freek
AU - Ruiz, Ignacio
AU - Ruszczyk, Chet
AU - Rygl, Kazi L.J.
AU - Sánchez, Salvador
AU - Sánchez-Arguelles, David
AU - Sanchez-Portal, Miguel
AU - Sasada, Mahito
AU - Satapathy, Kaushik
AU - Savolainen, Tuomas
AU - Schloerb, F. Peter
AU - Schuster, Karl Friedrich
AU - Shao, Lijing
AU - Shen, Zhiqiang
AU - Sohn, Bong Won
AU - Small, Des
AU - SooHoo, Jason
AU - Souccar, Kamal
AU - Sun, He
AU - Tazaki, Fumie
AU - Tetarenko, Alexandra J.
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AU - Titus, Michael
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AU - Trent, Tyler
AU - Trippe, Sascha
AU - van Bemmel, Ilse
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
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
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AU - Zhang, Shuo
AU - Zhao, Shan Shan
N1 - Publisher Copyright: © 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/8/1
Y1 - 2022/8/1
N2 - The blazar J1924–2914 is a primary Event Horizon Telescope (EHT) calibrator for the Galactic center’s black hole Sagittarius A*. Here we present the first total and linearly polarized intensity images of this source obtained with the unprecedented 20 µas resolution of the EHT. J1924–2914 is a very compact flat-spectrum radio source with strong optical variability and polarization. In April 2017 the source was observed quasi-simultaneously with the EHT (April 5–11), the Global Millimeter VLBI Array (April 3), and the Very Long Baseline Array (April 28), giving a novel view of the source at four observing frequencies, 230, 86, 8.7, and 2.3 GHz. These observations probe jet properties from the subparsec to 100 pc scales. We combine the multifrequency images of J1924–2914 to study the source morphology. We find that the jet exhibits a characteristic bending, with a gradual clockwise rotation of the jet projected position angle of about 90° between 2.3 and 230 GHz. Linearly polarized intensity images of J1924–2914 with the extremely fine resolution of the EHT provide evidence for ordered toroidal magnetic fields in the blazar compact core.
AB - The blazar J1924–2914 is a primary Event Horizon Telescope (EHT) calibrator for the Galactic center’s black hole Sagittarius A*. Here we present the first total and linearly polarized intensity images of this source obtained with the unprecedented 20 µas resolution of the EHT. J1924–2914 is a very compact flat-spectrum radio source with strong optical variability and polarization. In April 2017 the source was observed quasi-simultaneously with the EHT (April 5–11), the Global Millimeter VLBI Array (April 3), and the Very Long Baseline Array (April 28), giving a novel view of the source at four observing frequencies, 230, 86, 8.7, and 2.3 GHz. These observations probe jet properties from the subparsec to 100 pc scales. We combine the multifrequency images of J1924–2914 to study the source morphology. We find that the jet exhibits a characteristic bending, with a gradual clockwise rotation of the jet projected position angle of about 90° between 2.3 and 230 GHz. Linearly polarized intensity images of J1924–2914 with the extremely fine resolution of the EHT provide evidence for ordered toroidal magnetic fields in the blazar compact core.
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U2 - 10.3847/1538-4357/ac7a40
DO - 10.3847/1538-4357/ac7a40
M3 - Article
AN - SCOPUS:85138963476
SN - 0004-637X
VL - 934
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 145
ER -