Illuminating the Active Universe: Multi-Wavelength and Multi-Messenger Insights into AGN

Session

Blazar Variability

14 Sept 2026, 15:30

Auditorium Telescopium (ESO)

12. Multiwavelength Odyssey of 3C 279 and Long-Term Monitoring of Gamma-Ray-Loud AGNs with the Nanshan 26 m Radio Telescope

KRISHNA MOHANA AMMENADKA (Xinjiang Astronomical Observatory (XAO), Chinese Academy of Sciences (CAS), China)

14/09/2026, 15:30

Regular

We present results from our comprehensive multiwavelength studies of the FSRQ 3C 279 (Krishna Mohana A et al. 2024, MNRAS, 527, 6970; 2025, ApJ, 989, 125) — one of the brightest and most variable blazars in the gamma-ray sky — alongside the first data release of the quasi-Simultaneous Multiwavelength Monitoring of gamma-ray-loud AGNs with the Nanshan 26 m radio telescope (SMMAN; Cui, Krishna...

42. Probing Relativistic Jets Through Multiwavelength Observations of Blazars

SANGEETHA KIZHAKKEKALAM (Janusz Gil Institute of Astronomy, University of Zielona Gora, Poland)

14/09/2026, 15:50

flash talk

Blazars represent the most extreme subclass of active galactic nuclei, characterized by relativistic jets aligned close to the line of sight and exhibiting strong variability across the electromagnetic spectrum. Their non-thermal emission is dominated by relativistically beamed radiation from the jet, making them ideal laboratories for studying particle acceleration and energy dissipation...

41. Full-Stokes monitoring of blazars at mm and cm wavelengths

Ioannis Myserlis (Institut de Radioastronomie Milimétrique (IRAM))

14/09/2026, 16:10

Regular

Blazars, the subclass of jetted AGN with their outflow axes closely aligned to our line of sight, comprise one of the most energetic, long-lived phenomena in the Universe. They are among the main constituents of the high-energy sky, especially in gamma-rays and up to TeV energies, and one of possible sources of astrophysical neutrinos. The low-energy part of their SEDs is understood as...

21. Color-like Gamma-ray Spectral Variability in Blazar Flares

TIANFANG ZHANG (NAOJ)

14/09/2026, 16:30

Regular

Blazars are highly variable gamma-ray sources whose flaring activity provides a direct probe of particle acceleration and radiation processes in relativistic jets. However, the gamma-ray spectral behavior associated with individual flare peaks has not yet been characterized systematically for a large blazar sample. In this work, we investigate whether blazars become spectrally harder or softer...

62. Multi-band optical variability of OJ 287 during 2015-2025

Omar Kurtanidze (Abastumani Observatory)

14/09/2026, 16:50

flash talk

We present multi-band optical observations of OJ 287 from 2015 to 2025 with a focus on its optical activity on diverse timescales. A total of 2296, 10927, 11484, and 2982 data points are obtained in B, V, R, and I bands, respectively. The densely sampled observations allow us to keep track of the source evolution that it has exhibited since the start of the predicted major optical flaring...

5. Recollimation shocks and nonlinear dynamics in relativistic AGN jets

Stella Boula (INAF-OAB)

14/09/2026, 17:10

Regular

Relativistic jets from Active Galactic Nuclei are quintessential multi-messenger engines, yet a persistent challenge remains in connecting their macroscopic evolution to the localized kinetic scales responsible for high-energy emission. This work presents high-resolution 2D and 3D relativistic magnetohydrodynamic (RMHD) simulations using the PLUTO code to bridge this gap. We investigate the...

20. Particle energization in strongly magnetized mildly relativistic collisionless shocks

Gabriel Torralba Paz (Max Planck Institute for Plasma Physics)

14/09/2026, 17:30

Regular

We demonstrate that magnetized mildly relativistic shocks may be efficient particle accelerators capable of accounting for the intense X-ray and gamma-ray emission observed in jets of active galactic nuclei (AGN).

We employ the particle-in-cell (PIC) method to investigate a mildly relativistic shock in a magnetized electron-ion plasma under two magnetic field configurations: an oblique...