Propagation of ultra-high-energy cosmic ray nuclei in cosmic magnetic fields and implications for anisotropy measurements

被引：20

作者：

Takami, Hajime ^{[1
]}

Inoue, Susumu ^{[2
]}

Yamamoto, Tokonatsu ^{[3
]}

机构：

[1] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[2] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[3] Konan Univ, Dept Phys, Higashinada Ku, Kobe, Hyogo 6588501, Japan

来源：

ASTROPARTICLE PHYSICS | 2012年 / 35卷 / 12期

关键词：

Ultra-high-energy cosmic rays; ACTIVE GALACTIC NUCLEI; CLUSTER ACCRETION SHOCKS; LARGE-SCALE STRUCTURE; ARRIVAL DISTRIBUTION; PARTICLE-ACCELERATION; RADIO GALAXIES; X-RAY; ORIGIN; SPECTRUM; BURSTS;

D O I：

10.1016/j.astropartphys.2012.03.008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent results from the Pierre Auger Observatory (PAO) indicate that the composition of ultra-high-energy cosmic rays (UHECRs) with energies above 10(19) eV may be dominated by heavy nuclei. An important question is whether the distribution of arrival directions for such UHECR nuclei can exhibit observable anisotropy or positional correlations with their astrophysical source objects despite the expected strong deflections by intervening magnetic fields. For this purpose, we have simulated the propagation of UHECR nuclei including models for both the extragalactic magnetic field (EGMF) and the Galactic magnetic field (GMF). We find that the GMF is particularly crucial for suppressing the anisotropy as well as source correlations. Assuming that only iron nuclei are injected steadily from sources with equal luminosity and spatially distributed according to the observed large scale structure in the local Universe, at the number of events published by the PAO solar (69 events above 5.5 x 10(19) eV), the arrival distribution of UHECRs would be consistent with no auto-correlation at 95% confidence if the mean number density of UHECR sources n(s) greater than or similar to 10(-6) Mpc(-3), and consistent with no cross-correlation with sources within 95% errors for n(s) greater than or similar to 10(-5) Mpc(-3). On the other hand, with 1000 events above 5.5 x 10(19) eV in the whole sky, next generation experiments can reveal auto-correlation with more than 99% probability even for n(s) less than or similar to 10(-3) Mpc(-3), and cross-correlation with sources with more than 99% probability for n(s) less than or similar to 10(-4) Mpc(-3). In addition, we find that the contribution of Centaurus A is required to reproduce the currently observed UHECR excess in the Centaurus region. Secondary protons generated by photodisintegration of primary heavy nuclei during propagation play a crucial role in all cases, and the resulting anisotropy at small angular scales should provide a strong hint of the source location if the maximum energies of the heavy nuclei are sufficiently high. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：767 / 780

页数：14

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