UHECR Echoes from the Council of Giants

Abstract

Recent anisotropy studies of UHECR data at energies $\gtrsim$ 40 EeV, have disclosed a correlation of their angular distribution with the extragalactic local structure, specifically with either local starburst galaxies or AGN. Using Monte Carlo simulations taking into account photo-disintegration processes, we further explore a framework in which these UHECRs were accelerated by Centaurus A in a recent powerful outburst before being scattered by magnetic fields associated with local, Council of Giant, extragalactic structure. We find that the observed intermediate scale anisotropies can be accounted for by the Council of Giant structure imposing a response function on the initial outburst of UHECRs from a single source located at Centaurus A's position. The presence of these local structures creates `echoes' of UHECRs after the initial impulse, and focusing effects. The strongest echo wave has a lag of $\sim$ 20 Myr, comparable to the age of synchrotron-emitting electrons in the giant Centaurus A lobes. Through consideration of the composition of both the direct and echo wave components, we find that the distribution of the light (1$<\ln A<$1.5) component across the sky offers exciting prospects for testing the echo model using future facilities such as Auger prime. Our results demonstrate the potential that UHECR nuclei offer, as "composition clocks", for probing propagation scenarios from local sources.

12 pages, 11 figures

References in corpus (19)

• The Circumgalactic Medium
• A census of baryons in the Universe from localized fast radio bursts
• Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above $8\times 10^{18}$ eV
• Depth of Maximum of Air-Shower Profiles at the Pierre Auger Observatory: Measurements at Energies above 10^17.8 eV
• Indications of Intermediate-Scale Anisotropy of Cosmic Rays with Energy Greater Than 57 EeV in the Northern Sky Measured with the Surface Detector of the Telescope Array Experiment
• High-energy particle acceleration at the radio-lobe shock of Centaurus A
• The mass of the black hole in Centaurus A from SINFONI AO-assisted integral-field observations of stellar kinematics
• High-energy Particle Acceleration and Production of Ultra-high-energy Cosmic Rays in the Giant Lobes of Centaurus A
• The WISE Extended Source Catalogue (WXSC) I: The 100 Largest Galaxies
• AugerPrime: the Pierre Auger Observatory Upgrade
• Arrival Directions of Cosmic Rays above 32 EeV from Phase One of the Pierre Auger Observatory
• Hot Extended Galaxy Halos Around Local L* Galaxies From Sunyaev-Zeldovich Measurements
• A Council of Giants
• Detection of magnetic fields in the circumgalactic medium of nearby galaxies using Faraday rotation
• Search for Large-scale Anisotropy on Arrival Directions of Ultra-high-energy Cosmic Rays Observed with the Telescope Array Experiment
• Revisiting the distance to the nearest UHECR source: Effects of extra-galactic magnetic fields
• Curious case of the maximum rigidity distribution of cosmic-ray accelerators
• Constraining density and metallicity of the Milky Way's hot gas halo from O VII spectra and ram-pressure stripping
• Galactic halo bubble magnetic fields and UHECR deflections

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• Ultrahigh-energy neutrinos as a probe of espresso-shear acceleration in jets of Centaurus A
• Cosmic ray transport and acceleration with magnetic mirroring
• The role of supernovae inside AGN jets in UHECR acceleration
• Revisiting Propagation Delays of Ultra-High-Energy Cosmic Rays from Long-lived Sources
• Displacement of ultra-high-energy cosmic ray source images by the intergalactic magnetic field: the cases of Cen A and M83