The CARMA-NRO Orion Survey: Filament Formation via Collision-induced Magnetic Reconnection—the Stick in Orion A

A unique filament is identified in the {\it Herschel} maps of Orion giant molecular cloud. The filament, which, we name Stick, ruler-straight and at an early evolutionary stage. Transverse position-velocity diagrams show two velocity components closing on Stick. shows consecutive rings/forks C$^{18}$O(1-0) channel maps, which reminiscent structures generated by magnetic reconnection. We propose that Stick formed via collision-induced reconnection (CMR). use magnetohydrodynamics (MHD) code Athena++ to simulate collision between diffuse clumps, each carrying anti-parallel field. clump produces a narrow, straight, dense with factor $>$200 increase density. production gas seven times faster than free-fall collapse. ring/fork-like radiative transfer maps. Cores are confined surface pressure. CMR can be important dense-gas-producing mechanism Galaxy beyond.