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The CARMA-NRO Orion survey: filament formation via collision-induced magnetic reconnection—the Stick in Orion A

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 conse...

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Main Authors: Kong, Shuo (Author) , Ossenkopf-Okada, Volker (Author) , Arce, Héctor G. (Author) , Bally, John (Author) , Sánchez-Monge, Álvaro (Author) , McGehee, Peregrine (Author) , Suri, Sümeyye (Author) , Klessen, Ralf S. (Author) , Carpenter, John M. (Author) , Lis, Dariusz C. (Author) , Nakamura, Fumitaka (Author) , Schilke, Peter (Author) , Smith, Rowan J. (Author) , Mairs, Steve (Author) , Goodman, Alyssa (Author) , Maureira, María José (Author)
Format: Article (Journal)
Language:English
Published: 2021 January 11
In: The astrophysical journal
Year: 2021, Volume: 906, Issue: 2
ISSN:1538-4357
DOI:10.3847/1538-4357/abc687
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4357/abc687
Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.3847/1538-4357/abc687
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Author Notes:Shuo Kong, Volker Ossenkopf-Okada, Héctor G. Arce, John Bally, Álvaro Sánchez-Monge, Peregrine McGehee, Sümeyye Suri, Ralf S. Klessen, John M. Carpenter, Dariusz C. Lis, Fumitaka Nakamura, Peter Schilke, Rowan J. Smith, Steve Mairs, Alyssa Goodman, and María José Maureira
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Summary: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.
Item Description:Gesehen am 12.02.2021
Physical Description:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/abc687

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