Magnetic Fields in the Milky Way Halo

S. A. Mao, N. M. McClure-Griffiths, B. M. Gaensler, J. C. Brown, C. L. Van Eck, M. Haverkorn, P. P. Kronberg, J. M. Stil, A. Shukurov, A. R. Taylor

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We present a study of the Milky Way halo magnetic field, determined from observations of Faraday rotation measure (RM) of extragalactic radio sources (EGS) in Galactic longitude range 100°-117° within 30° of the Galactic plane. We find negative median RMs in both the northern and southern Galactic hemispheres for /b/>15°, outside the latitude range where the disk field dominates. This suggest that the halo magnetic field towards the outer Galaxy does not reverse direction across the mid-plane. An azimuthal magnetic field at heights 0.8-2 kpc above/below the Galactic plane between the local and the Perseus spiral arm can reproduce the observed trend of RM against Galactic latitude. We propose that the Milky Way could have a halo magnetic field similar to that observed in M51.

Original languageEnglish
Pages (from-to)403
Number of pages1
JournalProceedings of the International Astronomical Union
Issue numberH16
Publication statusPublished - 2012
Externally publishedYes


Dive into the research topics of 'Magnetic Fields in the Milky Way Halo'. Together they form a unique fingerprint.

Cite this