Revisiting propagation delays of ultra-high-energy cosmic rays from long-lived sources

IF 4.2 3区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Rostom Mbarek , Damiano Caprioli
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引用次数: 0

Abstract

We revisit the time delay incurred during ultra-high energy cosmic ray (UHECR) propagation over cosmological distances and its potential impact on the correlation between UHECR directions of arrival and long-lived sources (i.e., with duty cycles of order of Myr, such as Active Galactic Nuclei (AGNs) and starburst galaxies), the UHECR chemical composition, and extragalactic magnetic field constraints. We propagate particles in different magnetic field configurations, spanning over an extended range of particle Larmor radii and magnetic field coherence lengths, also including attenuation losses. We conclude that UHECR delays could easily be comparable to (and longer than) AGN duty cycles, effectively erasing the correlation between known AGNs and UHECR anisotropies. We finally consider how strong constraints on the chemical composition of the heaviest UHECRs could enable a better characterization of extragalactic magnetic fields.
重访来自长寿命源的超高能量宇宙射线的传播延迟
我们重新审视了超高能宇宙射线(UHECR)在宇宙距离上传播时产生的时间延迟及其对UHECR到达方向与长寿命源(即具有Myr阶的占空比,如活动星系核(agn)和星爆星系)、UHECR化学成分和河外磁场约束之间的相关性的潜在影响。我们在不同的磁场配置下传播粒子,跨越了粒子拉莫尔半径和磁场相干长度的扩展范围,也包括衰减损失。我们得出结论,UHECR延迟可以很容易地与AGN占空比相媲美(甚至更长),有效地消除了已知AGN与UHECR各向异性之间的相关性。最后,我们考虑了对最重的uhecr的化学成分的严格限制如何能够更好地表征河外磁场。
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来源期刊
Astroparticle Physics
Astroparticle Physics 地学天文-天文与天体物理
CiteScore
8.00
自引率
2.90%
发文量
41
审稿时长
79 days
期刊介绍: Astroparticle Physics publishes experimental and theoretical research papers in the interacting fields of Cosmic Ray Physics, Astronomy and Astrophysics, Cosmology and Particle Physics focusing on new developments in the following areas: High-energy cosmic-ray physics and astrophysics; Particle cosmology; Particle astrophysics; Related astrophysics: supernova, AGN, cosmic abundances, dark matter etc.; Gravitational waves; High-energy, VHE and UHE gamma-ray astronomy; High- and low-energy neutrino astronomy; Instrumentation and detector developments related to the above-mentioned fields.
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