English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The propagation trajectories of the highest energy cosmic rays (HECRs) aredeflected by not only intergalactic magnetic field but also Galactic magneticfield (GMF). These magnetic fields can weaken the positive correlation betweenthe arrival directions of HECRs and the positions of their sources. In order toexplore the effect of GMF on the expected correlation, we simulate the arrivaldistribution of protons with the energy above $6 \times 10^{19}$ eV takingseveral GMF models into account, and then test the correlation between theprotons and their sources assumed in the simulation. The dependence of thecorrelation signals on GMF models are also investigated. The correlation can beobserved by accumulating $\sim 200$ protons in a half hemisphere. Typicalangular scale at which the positive signal of the correlation is maximizeddepends on the spiral component of GMF models. That angular scale is $\sim 5^o$for bisymmetric spiral (BS) GMF models and $\sim 7^o$ for axisymmetric spiral(AS) GMF models if the number density of HECR sources, $n_s$, is $\sim 10^{-4}$Mpc$^{-3}$. An additional vertical (dipole) component of GMF affects theseangular scale by $0.5^o$ - $1^o$. The difference between the correlation signalfor the BS models and that for the AS models is prominent in the northern sky.Significance of the positive correlation depends on source distribution. Theprobability that the number of simulated HECR events correlating with sourcesis smaller than the number of random events correlating with the same sourcesby chance is much less than $10^{-3}$ ($\sim 3\sigma$) in almost all the sourcedistributions with $n_s = 10^{-4}$ Mpc$^{-3}$ under 200 protons detection, but$\sim 10\%$ of source distributions predicts the chance probability more than$10^{-3}$ in the AS GMF model. In addition, we also briefly discuss the effectof GMF for heavy-nuclei dominated composition.

Does Galactic Magnetic Field Disturb the Correlation of the Highest Energy Cosmic Rays with their Sources?