SIMBAD references

2014ApJ...790L..14K - Astrophys. J., 790, L14 (2014/July-3)

Galaxy mergers as a source of cosmic rays, neutrinos, and gamma rays.


Abstract (from CDS):

We investigate the shock acceleration of particles in massive galaxy mergers or collisions, and show that cosmic rays (CRs) can be accelerated up to the second knee energy ∼0.1-1 EeV and possibly beyond, with a hard spectral index of Γ ~ 2. Such CRs lose their energy via hadronuclear interactions within a dynamical timescale of the merger shock, producing gamma rays and neutrinos as a by-product. If ∼10% of the shock dissipated energy goes into CR acceleration, some local merging galaxies will produce gamma-ray counterparts detectable by the Cherenkov Telescope Array. Also, based on the concordance cosmology, where a good fraction of the massive galaxies experience a major merger in a cosmological timescale, the neutrino counterparts can constitute ∼20%-60% of the isotropic background detected by IceCube.

Abstract Copyright:

Journal keyword(s): acceleration of particles - galaxies: evolution - neutrinos - shock waves

Status at CDS:  

Simbad objects: 3

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