Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign

@misc{principe2026broadband,
  title = {{Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign}},
  author = {G. Principe and J. C. Algaba and E. Aviano and W. Y. Cheong and K. Hada and D. Haggard and A. Hahn and S. G. Jorstad and E. V. Kravchenko and Y. Kovalev and S. S. Lee and M. Lisakov and S. Markoff and A. P. Marscher and M. Sasada and P. Voitsik and Kazunori Akiyama and Ezequiel Albentosa-Ruiz and Antxon Alberdi and Walter Alef and Richard Anantua and Eleni Antonopoulou and Keiichi Asada and Rebecca Azulay and Anne-Kathrin Baczko and David Ball and Bidisha Bandyopadhyay and John Barrett and Michi Baubock and Bradford A. Benson and Dan Bintley and Lindy Blackburn and Raymond Blundell and Katherine L. Bouman and Geoffrey C. Bower and Michael Bremer and Roger Brissenden and Silke Britzen and Avery E. Broderick and Dominique Broguiere and Thomas Bronzwaer and Sandra Bustamante and Douglas F. Carlos and John E. Carlstrom and Andrew Chael and Chi-kwan Chan and Dominic O. Chang and Koushik Chatterjee and Ming-Tang Chen and Yongjun Chen and Xiaopeng Cheng and Paul Chichura and Ilje Cho and Nicholas S. Conroy and John E. Conway and Thomas M. Crawford and Geoffrey B. Crew and Alejandro Cruz-Osorio and Yuzhu Cui and Brandon Curd},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2606.25868},
  eprint = {2606.25868},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.25868},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign
AU  - G. Principe
AU  - J. C. Algaba
AU  - E. Aviano
AU  - W. Y. Cheong
AU  - K. Hada
AU  - D. Haggard
AU  - A. Hahn
AU  - S. G. Jorstad
AU  - E. V. Kravchenko
AU  - Y. Kovalev
AU  - S. S. Lee
AU  - M. Lisakov
AU  - S. Markoff
AU  - A. P. Marscher
AU  - M. Sasada
AU  - P. Voitsik
AU  - Kazunori Akiyama
AU  - Ezequiel Albentosa-Ruiz
AU  - Antxon Alberdi
AU  - Walter Alef
AU  - Richard Anantua
AU  - Eleni Antonopoulou
AU  - Keiichi Asada
AU  - Rebecca Azulay
AU  - Anne-Kathrin Baczko
AU  - David Ball
AU  - Bidisha Bandyopadhyay
AU  - John Barrett
AU  - Michi Baubock
AU  - Bradford A. Benson
AU  - Dan Bintley
AU  - Lindy Blackburn
AU  - Raymond Blundell
AU  - Katherine L. Bouman
AU  - Geoffrey C. Bower
AU  - Michael Bremer
AU  - Roger Brissenden
AU  - Silke Britzen
AU  - Avery E. Broderick
AU  - Dominique Broguiere
AU  - Thomas Bronzwaer
AU  - Sandra Bustamante
AU  - Douglas F. Carlos
AU  - John E. Carlstrom
AU  - Andrew Chael
AU  - Chi-kwan Chan
AU  - Dominic O. Chang
AU  - Koushik Chatterjee
AU  - Ming-Tang Chen
AU  - Yongjun Chen
AU  - Xiaopeng Cheng
AU  - Paul Chichura
AU  - Ilje Cho
AU  - Nicholas S. Conroy
AU  - John E. Conway
AU  - Thomas M. Crawford
AU  - Geoffrey B. Crew
AU  - Alejandro Cruz-Osorio
AU  - Yuzhu Cui
AU  - Brandon Curd
PY  - 2026
DA  - 2026/09/21
PB  - arXiv
DO  - 10.48550/arxiv.2606.25868
UR  - https://arxiv.org/abs/2606.25868
AB  - The archetypal blazar 3C 279 hosts a prominent relativistic jet and exhibits strong broadband variability across the electromagnetic spectrum. In April 2017, the Event Horizon Telescope (EHT) observed 3C 279, alongside one of the most extensive quasi-simultaneous multiwavelength (MWL) campaigns ever conducted. With the aim of investigating the physical processes governing 3C 279, we analyzed individual observations and multiband light curves, and constructed a new quasi-simultaneous MWL spectrum. We also performed phenomenological modeling using the turbulent extreme multi-zone (TEMZ) model to constrain the fundamental physical properties of the source. The EHT observations reveal a clear flux increase in the innermost core between April 5 and 11, 2017. Over a broader timescale, radio measurements at longer wavelengths show concurrent enhancements in core flux and polarization around mid-April, coinciding with the ejection of a superluminal knot. Record UV-optical flares with strong polarization variability occurred in late March, followed by gamma-ray activity that declined before the end of the EHT observing period. During this interval, the source remained in a low X-ray state and showed no detectable VHE emission. The TEMZ modeling suggests that the broadband spectrum and variability of 3C 279 can be explained within a jet scenario in which turbulent plasma cells are compressed by a stationary conical shock. However, alternative interpretations, such as magnetic reconnection or a moving shock-in-jet event, remain plausible. This coordinated MWL campaign advances our understanding of the origin of jet and gamma-ray emission in 3C 279, while also providing a comprehensive publicly available dataset that will serve as a valuable reference for future studies.
ER  -