Intergalactic magnetism in a <i>γ</i> -ray beam as a model of Porphyrion
We estimate the magnetic field in the jets of the recently discovered 7 Mpc long Porphyrion system. We used nondetection of the system in gamma-rays to derive a lower bound on the co-moving magnetic field strength at the level of ∼10 nG (comoving). 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 γ -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.
Authors
- F. Vazza (ORCID: https://orcid.org/0000-0002-2821-7928)
- Chiara Caprini (ORCID: https://orcid.org/0000-0001-5393-2205)
- Axel Brandenburg (ORCID: https://orcid.org/0000-0002-7304-021X)
- A. Neronov (ORCID: https://orcid.org/0000-0002-6748-368X)
Institutions
- University of Geneva (CH)
- Centre National de la Recherche Scientifique (FR)
- Stockholm University (SE)
- Ilia State University (GE)
- Université Paris Cité (FR)
- Laboratoire AstroParticule et Cosmologie (FR)
- Osservatorio astronomico di Bologna (IT)
- Istituto di Radioastronomia di Bologna (IT)
- École Polytechnique Fédérale de Lausanne (CH)
- European Organization for Nuclear Research (CH)
- Carnegie Mellon University (US)
- KTH Royal Institute of Technology (SE)
- University of Bologna (IT)
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2025-03-28
- DOI
- https://doi.org/10.1051/0004-6361/202453099
- Citations
- 2
- Primary Topic
- Solar and Space Plasma Dynamics
- Type
- article
- Field-Weighted Citation Impact
- 2.31
Funders
- Fondazione Cariplo
- Vetenskapsrådet