Resolving the Inner Parsec of the Blazar J1924–2914 with the Event Horizon Telescope
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- Harvard-Smithsonian Ctr. Astrophys.; Nijmegen U., IMAPP; Baltimore, Space Telescope Sci.
- Bonn, Max Planck Inst., Radioastron.
- Boston U.
- Harvard U. (main); Harvard-Smithsonian Ctr. Astrophys.
- Arizona U., Astron. Dept. - Steward Observ.
- Harvard-Smithsonian Ctr. Astrophys.; Harvard U. (main)
- Granada U., Theor. Phys. Astrophys.
- MIT; Natl. Astron. Observ. of Japan; Harvard U. (main)
- Nijmegen U., IMAPP
- Valencia U., Astro. Astrophys.; Valencia U., IFIC
- Princeton U., PCTS; Baltimore, Space Telescope Sci.
- IAA, Granada; Bologna, Ist. Radioastronomia; Bonn, Max Planck Inst., Radioastron.
- Concepcion U.; Turku U.; Aalto U.
- MIT; Natl. Astron. Observ. of Japan; Frankfurt U.
- Perimeter Inst. Theor. Phys.; Waterloo U.; Waterloo U., IQC
- Tsung-Dao Lee Inst., Shanghai; Shanghai Jiaotong U.; Frankfurt U.
- Granada U., Theor. Phys. Astrophys.; Bonn, Max Planck Inst., Radioastron.
- UNAM, Morelia, Inst. Radioastron. Astrophys.; Mexico U., ICN
- Columbia U., Astron. Astrophys.; Flatiron Inst., New York; Nijmegen U., IMAPP
- Harvard-Smithsonian Ctr. Astrophys.
- Shanghai, Astron. Observ.; Nanjing U. Sci. Tech.; Bonn, Max Planck Inst., Radioastron.
- IAA, Granada
- Malaya U.
- Harvard U. (main); Harvard-Smithsonian Ctr. Astrophys.; Texas U., San Antonio
- Academia Sinica, Taiwan
- Valencia U., Astro. Astrophys.; Valencia U., IFIC; Bonn, Max Planck Inst., Radioastron.
- Yale Ctr. Astron. Astrophys.
- MIT
- Illinois U., Urbana
- Fermilab; Chicago U., Astron. Astrophys. Ctr.
- Subaru Telescope
- Leiden Observ.
- Caltech
- East Asian Observ.; Hawaii U.
- McGill U.
- IRAM, St. Martin d'Heres
- Massachusetts U., Amherst
- KASI, DaeJeon; KAIST, Taejon
- Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.; Chicago U.; Chicago U., EFI
- Chalmers U. Tech.
- Cornell U., Radio. Space Res. Ctr.
- East Asian Observ.
- Shanghai, Astron. Observ.; Nanjing U. Sci. Tech.
- Fairfield U.
- Illinois U., Urbana, Astron. Dept.; Harvard-Smithsonian Ctr. Astrophys.
- Chicago U., Astron. Astrophys. Ctr.; Chicago U., KICP
- Frankfurt U.
- Natl. Astron. Observ. of Japan; Tokyo, Grad. U. Adv. Stud.
- Naples U.; Frankfurt U.; INFN, Naples
- U. Witwatersrand, Johannesburg, Sch. Phys.; Pretoria U.; Rhodes U.
- Subaru Telescope; ASTRON, Dwingeloo
- LESIA, Meudon
- Colorado U.
- IRAM, St. Martin d'Heres; Bonn, Max Planck Inst., Radioastron.
- NAOC, Beijing; Bonn, Max Planck Inst., Radioastron.
- Las Cumbres Observ.; UC, Santa Barbara
- NRAO, Charlottesville
- MIT; Google Inc.
- U. Wurzburg (main); Frankfurt U.; Bonn, Max Planck Inst., Radioastron.
- Harvard U. (main); Harvard U.; Harvard U., Phys. Dept.
- Illinois U., Urbana; Illinois U., Urbana, Astron. Dept.
- Waterloo U.; Waterloo U., IQC; Perimeter Inst. Theor. Phys.
- Cagliari U.; Cagliari Observ.
- Southern Denmark U., CP3-Origins; Frankfurt U.
- INAOE, Puebla; Conacyt, Mexico
- Shanghai, Astron. Observ.
- Kapteyn Astron. Inst., Groningen
- Peking U.; Peking U., Beijing, KIAA
- Academia Sinica, Taiwan; Subaru Telescope
- Natl. Astron. Observ. of Japan; Tokyo, Grad. U. Adv. Stud.; Tokyo U.
- INAOE, Puebla
- Natl. Astron. Observ. of Japan; Tokyo, Inst. Statistical Math.; Tokyo U., IPMU
- Leiden Observ.; NRAO, Charlottesville
- Unlisted, US, MA
- Perimeter Inst. Theor. Phys.; Waterloo U.
- Tokyo U., ICRR
- ASTRON, Dwingeloo
- Subaru Telescope; KASI, DaeJeon; Bonn, Max Planck Inst., Radioastron.
- KASI, DaeJeon
- Arizona U., Astron. Dept. - Steward Observ.; Caltech
- Natl. Astron. Observ. of Japan; Kogakuin U.
- Natl. Astron. Observ. of Japan; Tokyo U.
- Niigata U.
- Taiwan, Natl. Normal U.; Taiwan, Natl. Taiwan U.; Academia Sinica, Taiwan
- Hong Kong, Chinese U.
- Nanjing U., Dept. Astron.
- Nijmegen U., IMAPP; Harvard-Smithsonian Ctr. Astrophys.; IAA, Granada; Bologna, Ist. Radioastronomia; Bonn, Max Planck Inst., Radioastron.
- Bologna Observ.
- Academia Sinica, Taiwan; Taiwan, Natl. Taiwan U.
- Subaru Telescope; Yunnan Observ.; NAOC, Beijing
- Bologna Observ.; Bonn, Max Planck Inst., Radioastron.
- U. Amsterdam, GRAPPA
- Princeton, Inst. Advanced Study; Arizona U., Astron. Dept. - Steward Observ.
- ESTEC, Noordwijk; Chicago U., Astron. Astrophys. Ctr.
- Nijmegen U., IMAPP; Harvard-Smithsonian Ctr. Astrophys.; Tsung-Dao Lee Inst., Shanghai; Shanghai Jiaotong U.; Frankfurt U.
- Bonn, Max Planck Inst., Radioastron.; Nijmegen U., IMAPP
- U. Amsterdam, GRAPPA; Nijmegen U., IMAPP
- IRAM, Granada
- Illinois U., Urbana, Astron. Dept.
- Concepcion U.
- Hachinohe Inst. Tech.; Academia Sinica, Taiwan
- U. Witwatersrand, Johannesburg, Sch. Phys.; South African Astron. Observ.
- Frankfurt U.; Athens U.
- Villanova U.
- Washington U., St. Louis
- Sejong U.
- Natl. Astron. Observ. of Japan
- Academia Sinica, Taiwan; Perimeter Inst. Theor. Phys.; Canadian Inst. Theor. Astrophys.; Toronto U., Astron. Dept.; Canadian Inst. Advanced Res.
- UC, Berkeley
- U. Amsterdam, GRAPPA; Frankfurt U.
- University Coll., Cork; Bonn, Max Planck Inst., Radioastron.
- Perimeter Inst. Theor. Phys.
- Taiwan, Natl. Normal U.; Academia Sinica, Taiwan
- Gemini Observ., Hilo; Subaru Telescope
- Frankfurt U.; Frankfurt U., FIAS; Trinity Coll., Dublin
- Princeton U., Astrophys. Sci. Dept.; Flatiron Inst., New York
- Harvard-Smithsonian Ctr. Astrophys.; Harvard U. (main); Nijmegen U., IMAPP
- Natl. Astron. Observ. of Japan; Hiroshima U.
- Aalto U.; Bonn, Max Planck Inst., Radioastron.
- Peking U., Beijing, KIAA; Bonn, Max Planck Inst., Radioastron.
- Subaru Telescope; Shanghai, Astron. Observ.; Nanjing U. Sci. Tech.
- Subaru Telescope; KASI, DaeJeon; KAIST, Taejon; Yonsei U.
- Texas Tech. U., Lubbock; Baltimore, Space Telescope Sci.
- Nijmegen U., IMAPP; Leiden Observ.; NWO, The Hague; Arizona U., Astron. Dept. - Steward Observ.
- Bonn, Max Planck Inst., Radioastron.; IRAM, Granada
- Seoul Natl. U.; Subaru Telescope
- ASTRON, Dwingeloo; Leiden Observ.; New Mexico U.
- Central Lancashire U.
- Brandeis U.
- Tuorla Observ.
- Princeton, Inst. Advanced Study; Princeton U.
- Subaru Telescope; Hua-Zhong U. Sci. Tech.
- Mullard Space Sci. Lab.; Frankfurt U.
- Subaru Telescope; Shanghai, Astron. Observ.; Beijing, GUCAS
- Subaru Telescope; Hefei, CUST
- Bard Coll.
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.
- Research Organization:
- INFN, Naples; LESIA, Meudon; IRAM, Granada; Chicago U., EFI; UNAM, Morelia, Inst. Radioastron. Astrophys.; Peking U.; Yale Ctr. Astron. Astrophys.; ASTRON, Dwingeloo; University Coll., Cork; Harvard-Smithsonian Ctr. Astrophys.; Hefei, CUST; U. Wurzburg (main); ESTEC, Noordwijk; Nijmegen U., IMAPP; Canadian Inst. Theor. Astrophys.; Naples U.; Fairfield U.; Hachinohe Inst. Tech.; Mullard Space Sci. Lab.; NAOC, Beijing; NWO, The Hague; Princeton, Inst. Advanced Study; KAIST, Taejon; Baltimore, Space Telescope Sci.; INAOE, Puebla; Gemini Observ., Hilo; Granada U., Theor. Phys. Astrophys.; Natl. Astron. Observ. of Japan; Colorado U.; Flatiron Inst., New York; Princeton U., PCTS; Canadian Inst. Advanced Res.; South African Astron. Observ.; Central Lancashire U.; Toronto U., Astron. Dept.; Seoul Natl. U.; Peking U., Beijing, KIAA; Sejong U.; Niigata U.; Athens U.; Illinois U., Urbana, Astron. Dept.; Texas U., San Antonio; Frankfurt U., FIAS; Harvard U. (main); Valencia U., Astro. Astrophys.; Academia Sinica, Taiwan; Hong Kong, Chinese U.; Tokyo, Inst. Statistical Math.; Taiwan, Natl. Normal U.; Chicago U.; Illinois U., Urbana; Turku U.; Boston U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Princeton U., Astrophys. Sci. Dept.; Mexico U., ICN; Kapteyn Astron. Inst., Groningen; Hua-Zhong U. Sci. Tech.; Perimeter Inst. Theor. Phys.; NRAO, Charlottesville; Cagliari Observ.; McGill U.; Texas Tech. U., Lubbock; Tsung-Dao Lee Inst., Shanghai; Las Cumbres Observ.; Massachusetts U., Amherst; Kogakuin U.; Brandeis U.; Waterloo U.; Tokyo, Grad. U. Adv. Stud.; Trinity Coll., Dublin; Bonn, Max Planck Inst., Radioastron.; Valencia U., IFIC; Southern Denmark U., CP3-Origins; Princeton U.; Shanghai Jiaotong U.; Washington U., St. Louis; Leiden Observ.; UC, Santa Barbara; Chalmers U. Tech.; U. Witwatersrand, Johannesburg, Sch. Phys.; Yonsei U.; IRAM, St. Martin d'Heres; Bologna, Ist. Radioastronomia; Pretoria U.; MIT; U. Amsterdam, GRAPPA; Nanjing U. Sci. Tech.; Waterloo U., IQC; Beijing, GUCAS; Chicago U., Astron. Astrophys. Ctr.; UC, Berkeley; Tuorla Observ.; Yunnan Observ.; New Mexico U.; Malaya U.; Hiroshima U.; Nanjing U., Dept. Astron.; Villanova U.; Taiwan, Natl. Taiwan U.; Caltech; Rhodes U.; Bard Coll.; Hawaii U.; Conacyt, Mexico; Chicago U., KICP; Tokyo U.; Google Inc.; Bologna Observ.; Subaru Telescope; KASI, DaeJeon; Aalto U.; IAA, Granada; Harvard U.; Concepcion U.; Columbia U., Astron. Astrophys.; Cornell U., Radio. Space Res. Ctr.; Unlisted, US, MA; East Asian Observ.; Tokyo U., IPMU; Shanghai, Astron. Observ.; Tokyo U., ICRR; Harvard U., Phys. Dept.; Cagliari U.; Frankfurt U.; Arizona U., Astron. Dept. - Steward Observ.
- Sponsoring Organization:
- US Department of Energy
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1885020
- Report Number(s):
- FERMILAB-PUB-22-653-PPD; oai:inspirehep.net:2132004; arXiv:2208.01662
- Journal Information:
- Astrophys.J., Journal Name: Astrophys.J. Vol. 934
- Country of Publication:
- United States
- Language:
- English
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