On Gamma Rays as Predictors of Ultra-high-energy Cosmic-Ray Flux in Active Galactic Nuclei

被引：0

作者：

de Oliveira, Caina ^{[1
]}

Lang, Rodrigo Guedes ^{[2
]}

Batista, Pedro ^{[2
]}

机构：

[1] Univ Sao Paulo, Inst Fis Sao Carlos, Ave Trabalhador Sao carlense 400, Sao Carlos, Brazil

[2] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Nikolaus Fiebiger Str 2, D-91058 Erlangen, Germany

来源：

ASTROPHYSICAL JOURNAL | 2025年 / 981卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

PARTICLE-ACCELERATION; RADIO GALAXIES; ARRIVAL DIRECTIONS; RELATIVISTIC JETS; HADRONIC ORIGIN; DOPPLER FACTORS; GIANT LOBE; FERMI-LAT; CENTAURUS; SPECTRUM;

D O I：

10.3847/1538-4357/adafa2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Active galactic nuclei (AGN) are among the main candidates for ultra-high-energy cosmic-ray (UHECR) sources. However, while some theoretical and phenomenological works favor AGNs as the main sources, recent works have shown that using the very-high-energy gamma-ray flux as a proxy for the UHECR flux leads to a bad agreement with data. In this context, the energy spectrum and composition data are hardly fitted. At the same time, the arrival directions map is badly described and a spurious dipole direction is produced. In this work, we propose a possible solution to these contradictions. Using the observed gamma-ray flux as a proxy may carry the implicit assumption of beamed UHECR emission and, consequently, its beam will remain collimated up to its detection on Earth. We show that assuming an isotropic UHECR emission and correcting the gamma-ray emission proxy by Doppler boosting can overcome the problem. The combined fit of the spectrum and composition is improved, with a change of reduced chi(2) from 4.6 to 3.1. In particular, the tension between the observed and modeled dipole directions can be reduced from 5.9 (2.1)sigma away from the data to 3.5 (1.1)sigma for E > 8 EeV (E > 32 EeV). We also show that this effect is particularly important when including AGNs of different classes in the same analysis, such as radio galaxies and blazars.

引用

页数：11

共 106 条

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