Orion A's complete 3D magnetic field morphology

Abstract

Magnetic fields permeate the interstellar medium and are important in the star formation process. Determining the 3D magnetic fields of molecular clouds will allow us to better understand their role in the evolution of these clouds and formation of stars. We fully reconstruct the approximate three-dimensional (3D) magnetic field morphology of the Orion A molecular cloud (on scales of a few to ~100 pc) using Galactic magnetic field models, as well as present line-of-sight and plane-of-sky magnetic field observations. While previous studies identified the 3D magnetic field morphology of the Orion A cloud as an arc shape, in this study we provide the orientation of this arc-shaped field and its plane-of-sky direction, for the first time. We find that this 3D field is a tilted, semi-convex (from our point of view) structure and mostly points in the direction of decreasing latitude and longitude on the plane of the sky, from our vantage point. The previously identified bubbles and events in this region were key in shaping this arc-shaped magnetic field morphology.

9 pages, 9 Figures, accepted in Astronomy & Astrophysics

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Cited by in corpus (4)

• Three-dimensional magnetic fields of molecular clouds
• Necessary conditions for the formation of filaments and star clusters in the cold neutral medium
• The Orion-Taurus ridge: a synchrotron radio loop at the edge of the Orion-Eridanus superbubble
• Spectropolarimetry of Magnetic Chemically Peculiar Stars in the Orion OB1 Association