Confirmation of a Faraday Rotation Measure Anomaly in Cygnus

Details Confirmation of a Faraday Rotation Measure Anomaly in Cygnus Confirmation of a Faraday Rotation Measure Anomaly in Cygnus

2008-02-04

arxiv.org/abs/0802.0481v1

Astrophys.J.694:1452-1463,2009

Astronomy and Astrophysics

Astrophysics

Submitted to the Astrophysical Journal

Scientific paper

10.1088/0004-637X/694/2/1452

We confirm the reality of a reversal of the sign of the Faraday Rotation Measure in the Galactic plane in Cygnus (Lazio et al, 1990), possibly associated with the Cygnus OB1 association. The rotation measure changes by several hundred rad/m$^2$ over an angular scale of $2-5^{\circ}$. We show that a simple model of an expanding plasma shell with an enhanced density and magnetic field, consistent with observations of H$\alpha$ emission in this part of sky, and physically associated with a superbubble of the Cygnus OB1 association, can account for the magnitude and angular scale of this feature.

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