Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign
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.
- Published in:
arXiv - Type:
Article - Authors:
- Year:
2026 - Source:
http://arxiv.org/abs/2606.25868
Citation information
: Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign, arXiv, 2026, {arXiv}:2606.25868, June, {arXiv}, http://arxiv.org/abs/2606.25868, Principe.etal.2026a,
@Article{Principe.etal.2026a,
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title={Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign},
journal={arXiv},
number={{arXiv}:2606.25868},
month={June},
publisher={{arXiv}},
url={http://arxiv.org/abs/2606.25868},
year={2026},
abstract={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...}}
