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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

(abridged) Ultra-high energy cosmic rays (UHECRs) are highly energeticcharged particles with energies exceeding $10^{18}$ eV. Identifying theirsources and production mechanism can provide insight into many open questionsin astrophysics and high energy physics. However, the Galactic magnetic field(GMF) deflects UHECRs, and the high uncertainties in our current understandingof the $3$-dimensional structure of the GMF does not permit us to accuratelydetermine their true arrival direction on the plane of the sky (PoS). Thisdifficulty arises from the fact that currently all GMF observations areintegrated along the line-of-sight (LoS). Upcoming stellar optopolarimetricsurveys as well as Gaia data on stellar parallaxes, are expected to providelocal measurements of the GMF in the near future. In this paper, we evaluatethe reconstruction of the GMF in a limited region of the Galaxy given sparseand local GMF measurements within that region, through Bayesian inference usingprinciples of Information Field Theory. We backtrack UHECRs through GMFconfigurations drawn from the posterior to improve our knowledge of their truearrival directions. We show that, for a weakly turbulent GMF, it is possible tocorrect for its effect on the observed arrival direction of UHECRs to within$\sim 3^\circ$. For completely turbulent fields, we show that our procedure canstill be used to significantly improve our knowledge on the true arrivaldirection of UHECRs.

Reconstructing Galactic magnetic fields from local measurements for backtracking ultra-high-energy cosmic rays