CERN Accelerating science

Preprint
Report number	NORDITA-2024-041 ; CERN-TH-2024-187 ; arXiv:2411.01640
Title	Intergalactic magnetism in a gamma-ray beam as a model of Porphyrion
Author(s)	Neronov, A. (APC, Paris ; LASTRO Observ.) ; Vazza, F. (U. Bologna, DIFA ; Bologna, Ist. Radioastronomia) ; Brandenburg, A. (Royal Inst. Tech., Stockholm ; Stockholm U., OKC ; Carnegie Mellon U. (main) ; Ilia State U.) ; Caprini, C. (Geneva U., Dept. Theor. Phys. ; CERN)
Imprint	2024-11-03
Number of pages	5
Note	5 pages, 4 figures
Subject category	astro-ph.CO ; Astrophysics and Astronomy ; astro-ph.HE ; Astrophysics and Astronomy
Abstract	We estimate the magnetic field in the jets of the recently discovered 7 Mpc long Porphyrion system. We use non-detection of the system in gamma-rays to derive a lower bound on the co-moving magnetic field strength at the level of  10 nG. This value is consistent with recent estimates of magnetic fields in the filaments of the Large Scale Structure. We discuss the possibility that, instead of being the extreme case of a radio jet formation scenario, Porphyrion actually traces a very-high-energy gamma-ray beam emitted by an active galactic nucleus. In such a model, jets do not need to spread into the voids of the Large Scale Structure to appear straight on a very large distance range, and several anomalies of the standard radio jet scenarios can be solved at once.
Other source	Inspire
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0)