Ultrahigh energy cosmic ray acceleration in newly born magnetars and their associated gravitational wave signatures

Abstract

Newly born magnetars are good candidate sources of ultrahigh energy cosmic rays. These objects can in principle easily accelerate particles to the highest energies required to satisfy the ultrahigh energy cosmic ray scenario (E~10^{20-21} eV), thanks to their important rotational and magnetic energy reservoirs. Their acceleration mechanism, based on unipolar induction, predicts however a hard particle injection that does not fit the observed ultrahigh energy cosmic ray spectrum. Here we show that an adequate distribution of initial voltages among magnetar winds can be found to soften the spectrum. We discuss the effect of these distributions for the stochastic gravitational wave background signature produced by magnetars. The magnetar population characteristics needed to fit the ultrahigh energy cosmic ray spectrum could lead in most optimistic cases to gravitational wave background signals enhanced of up to four orders of magnitudes in the range of frequency 1-100 Hz, compared to the standard predictions. These signals could reach the sensitivities of future detectors such as DECIGO or BBO.

16 pages, 7 figures, version to appear in PRD

References in corpus (8)

• Physics of Strongly Magnetized Neutron Stars
• The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
• Cosmogenic Neutrinos: parameter space and detectabilty from PeV to ZeV
• GRB afterglow plateaus and Gravitational Waves: multi-messenger signature of a millisecond magnetar?
• Measurement of the Flux of Ultra High Energy Cosmic Rays by the Stereo Technique
• The optical depth of the Universe to ultrahigh energy cosmic ray scattering in the magnetized large scale structure
• The Birthrate of Magnetars
• Newborn Magnetars as sources of Gravitational Radiation: constraints from High Energy observations of Magnetar Candidates

Cited by in corpus (9)

• Gravitational wave background from rotating neutron stars
• High-Energy Neutrino Signatures of Newborn Pulsars In the Local Universe
• Ultra-high Energy Cosmic Rays and Neutrinos from Gamma-Ray Bursts, Hypernovae and Galactic Shocks
• Systematic exploration of heavy element nucleosynthesis in protomagnetar outflows
• Ultrahigh-energy neutrino searches using next-generation gravitational wave detectors at radio neutrino detectors: GRAND, IceCube-Gen2 Radio, and RNO-G
• Acceleration of ultra-high energy cosmic rays in the early afterglows of gamma-ray bursts: concurrence of jet's dynamics and wave-particle interactions
• Observational strategies for ultrahigh-energy neutrinos: the importance of deep sensitivity for detection and astronomy
• Gamma-ray emission from decays of boosted nuclei in protomagnetar jets
• Aspects of astrophysical particle production and beyond the Standard Model phenomenology