Confronting observations of VHE gamma-ray blazar flares with reconnection models

J. Jormanainen*, T. Hovatta, E. Lindfors, I. Christie, M. Petropoulou, I. Liodakis

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

26 Downloads (Pure)


Several models have been suggested to explain the fast gamma-ray variability observed in blazars, but its origin is still debated. One scenario is magnetic reconnection, a process that can efficiently convert magnetic energy to energy of relativistic particles accelerated in the reconnection layer. In our study, we compare results from state-of-the-art particle-in-cell simulations with observations of blazars at Very High Energy (VHE, E > 100 GeV) gamma-rays. Our goal is to test our model predictions on fast gamma-ray variability with data and to constrain the parameter space of the model, such as the magnetic field strength of the unreconnected plasma and the reconnection layer orientation in the blazar jet. For this first comparison, we used the remarkably well-sampled VHE gamma-ray light curve of Mrk 421 observed with the MAGIC and VERITAS telescopes in 2013. The simulated VHE light curves were generated using the observable parameters of Mrk 421, such as the jet power, bulk Lorentz factor, and the jet viewing angle, and sampled as real data. Our results pave the way for future model-to-data comparison with next-generation Cherenkov telescopes, which will help further constrain the different variability models.

Original languageEnglish
Article number867
Number of pages8
JournalProceedings of Science
Publication statusPublished - 18 Mar 2022
MoE publication typeA4 Conference publication
EventInternational Cosmic Ray Conference - Virtual, Berlin, Germany
Duration: 12 Jul 202123 Jul 2021
Conference number: 37


Dive into the research topics of 'Confronting observations of VHE gamma-ray blazar flares with reconnection models'. Together they form a unique fingerprint.

Cite this