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We present new Faraday rotation measures (RMs) for 148 extragalactic radiosources behind the southern Galactic plane (253o < l < 356o, |b| < 1.5o), anduse these data in combination with published data to probe the large-scalestructure of the Milky Way's magnetic field. We show that the magnitudes ofthese RMs oscillate with longitude in a manner that correlates with thelocations of the Galactic spiral arms. The observed pattern in RMs requries thepresence of at least one large-scale magnetic reversal in the fourth Galacticquadrant, located between the Sagittarius- Carina and Scutum-Crux spiral arms.To quantitatively compare our measurements to other recent studies, we considerall available extragalactic and pulsar RMs in the region we have surveyed, andjointly fit these data to simple models in which the large-scale field followsthe spiral arms. In the best-fitting model, the magnetic field in the fourthGalactic quadrant is directed clockwise in the Sagittarius-Carina spiral arm(as viewed from the North Galactic pole), but is oriented counter- clockwise inthe Scutum-Crux arm. This contrasts with recent analyses of pulsar RMs alone,in which the fourth-quadrant field was presumed to be directedcounter-clockwise in the Sagittarius- Carina arm. Also in contrast to recentpulsar RM studies, our joint modeling of pulsar and extragalactic RMsdemonstrates that large numbers of large-scale magnetic field reversals are notrequired to account for observations.

astrophysical journal/the astrophysical journal

Rotation Measures of Extragalactic Sources Behind the Southern Galactic  Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky  Way