Galactic halo bubble magnetic fields and UHECR deflections

Vasundhara Shaw, Arjen van Vliet, Andrew M. Taylor

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We consider the synchrotron emission from electrons out in the Galactic halo bubble region where the Fermi bubble structures reside. Utilizing a simple analytical expression for the non-thermal electron distribution and a toy magnetic field model, we simulate polarized synchrotron emission maps at a frequency of 30 GHz. Comparing these maps with the observational data, we obtain constraints on the parameters of our toy Galactic halo bubble magnetic field model. Utilizing this parameter value range for the toy magnetic field model, we determine the corresponding range of arrival directions and suppression factors of ultra high energy cosmic rays (UHECRs) from potential local source locations. We find that high levels of flux suppression (down to 2 per cent) and large deflection angles (≥80) are possible for source locations whose line of sight pass through the Galactic halo bubble region. We conclude that the magnetic field out in the Galactic halo bubble region can strongly dominate the level of deflection UHECRs experience whilst propagating from local sources to Earth.

Original languageBritish English
Pages (from-to)2534-2545
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume517
Issue number2
DOIs
StatePublished - 1 Dec 2022

Keywords

  • astroparticle physics
  • galaxies: magnetic fields
  • radiation mechanisms: non-thermal

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