The magnetic field in the Perseus spiral arm

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Structure, Interstellar Magnetic Fields, Milky Way Galaxy, Faraday Effect, Galactic Rotation, Radio Sources (Astronomy), Statistical Analysis

Scientific paper

The rotation measure data for extragalactic radio sources are used to estimate the value and direction of a large-scale galactic magnetic field in the Perseus spiral arm. The field with the value of |B| ≅ 3.2 μG lies in the galactic plane. It is directed along l ≅ 280° in the opposite direction compared to the magnetic field in the local Orion arm. Variance of the field is of the order of δB/B ≅ 1.4.

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