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- W3104883583 abstract "Using a new, expanded compilation of extragalactic source Faraday rotation measures (RM) we investigate the broad underlying magnetic structure of the Galactic disk at latitudes $|b|$ $lesssim 15^{circ}$ over all longitudes $l$, where our total number of RM's in this low-latitude range of the Galactic sky is comparable to those in the combined Canadian Galactic Plane Survey(CGPS) at $|b| < 4^{circ}$ and the Southern Galactic Plane (SGPS) $|b| < 1.5^{circ}$ survey. We report newly revealed, remarkably coherent patterns of RM at $|b|$ $lesssim 15^{circ}$ from $l sim 270^{circ}$ to $sim 90^circ$ and RM($l$) features of unprecedented clarity that replicate in $l$ with opposite sign on opposite sides of the Galactic center. They confirm a highly patterned bisymmetric field structure toward the inner disc, an axisymmetic pattern toward the outer disc, and a very close coupling between the CGPS/SGPS RM's at $|b| lesssim 3^{circ}$ (mid-plane) and our new RM's up to $|b| sim 15^{circ}$ (near-plane). Our analysis also shows the approximate $z$-height -- the vertical height of the coherent component of the disc field above the Galactic disc's mid-plane -- to be $sim 1.5$kpc out to $sim 6$ kpc from the Sun. This identifies the approximate height of the transition layer to the halo field structure. We find no RM sign change across the plane within $|b| sim 15^{circ}$ in any longitude range. The prevailing {it disc} field pattern, and its striking degree of large scale ordering confirm that our side of the Milky Way has a very organized underlying magnetic structure, for which the inward spiral pitch angle is $5.5^{circ}, pm 1^{circ}$ at all $|b|$ up to $sim 12^{circ}$ in the inner semicircle of Galactic longitudes. It decreases to $sim 0^{circ}$ toward the anticentre." @default.
- W3104883583 created "2020-11-23" @default.
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- W3104883583 date "2011-01-01" @default.
- W3104883583 modified "2023-10-16" @default.
- W3104883583 title "Remarkable Symmetries in the Milky Way Disc's Magnetic Field" @default.
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- W3104883583 doi "https://doi.org/10.1071/as10045" @default.
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