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Journal Article

The CARMA-NRO Orion Survey: Filament formation via collision-induced magnetic reconnection-the stick in Orion A

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Maureira,  María José
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Kong, S., Ossenkopf-Okada, V., Arce, H. G., Bally, J., Sánchez-Monge, Á., McGehee, P., et al. (2021). The CARMA-NRO Orion Survey: Filament formation via collision-induced magnetic reconnection-the stick in Orion A. The Astrophysical Journal, 906(2): 80. doi:10.3847/1538-4357/abc687.


Cite as: https://hdl.handle.net/21.11116/0000-0008-0D2A-C
Abstract
A unique filament is identified in the Herschel maps of the Orion A giant molecular cloud. The filament, which we name the Stick, is ruler-straight and at an early evolutionary stage. Transverse position–velocity diagrams show two velocity components closing in on the Stick. The filament shows consecutive rings/forks in C18O (1−0) channel maps, which is reminiscent of structures generated by magnetic reconnection. We propose that the Stick formed via collision-induced magnetic reconnection (CMR). We use the magnetohydrodynamics code Athena++ to simulate the collision between two diffuse molecular clumps, each carrying an antiparallel magnetic field. The clump collision produces a narrow, straight, dense filament with a factor of >200 increase in density. The production of the dense gas is seven times faster than freefall collapse. The dense filament shows ring/fork-like structures in radiative transfer maps. Cores in the filament are confined by surface magnetic pressure. CMR can be an important dense-gas-producing mechanism in the Galaxy and beyond.