A New Model For The Loop-I (The North Polar Spur) Region

Details A New Model For The Loop-I (The North Polar Spur) Region A New Model For The Loop-I (The North Polar Spur) Region

2007-04-02

arxiv.org/abs/0704.0276v1

Astrophys.J.664:349-356,2007

Astronomy and Astrophysics

Astrophysics

17 pages, 6 figures, to appear in ApJ

Scientific paper

10.1086/518711

The North Polar Spur (NPS) is the brightest filament of Loop I, a large circular feature in the radio continuum sky. In this paper, a model consisting of two synchrotron emitting shells is presented that reproduces large-scale structures revealed by recent polarization surveys. The polarized emission of the NPS is reproduced by one of these shells. The other shell, which passes close to the Sun, gives rise to polarized emission towards the Galactic poles. It is proposed that X-ray emission seen towards the NPS is produced by interaction of the two shells. Two OB-associations coincide with the centers of the shells. A formation scenario of the Loop I region is suggested.

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