Counterclockwise magnetic fields in the Norma spiral arm

Details Counterclockwise magnetic fields in the Norma spiral arm Counterclockwise magnetic fields in the Norma spiral arm

2002-03-29

arxiv.org/abs/astro-ph/0203517v2

published in ApJ 570, L17-L20 (2002)

Astronomy and Astrophysics

Astrophysics

minor changes

Scientific paper

10.1086/340931

Pulsars provide unique probes of the large-scale interstellar magnetic field in the Galactic disk. Up to now, the limited Galactic distribution of the known pulsar population has restricted these investigations to within a few kiloparsec of the Sun. The Parkes multibeam pulsar survey has discovered many more-distant pulsars which enables us for the first time to explore the magnetic field in most of the nearby half of the Galactic disk. Here we report the detection of counterclockwise magnetic fields in the Norma spiral arm using pulsar rotation measures. The fields are coherent in direction over a linear scale of $\sim 5$ kpc along the arm and have a strength of $-4.4\pm0.9$ $\mu$G. The magnetic field between the Carina-Sagittarius and Crux-Scutum arms is confirmed to be coherent from $l\sim45\degr$ to $l\sim305\degr$ over a length of $\sim 10$ kpc. These results strengthen arguments for a bisymmetric spiral model for the field configuration in the Galactic disk.

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