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We present combined observations of the NH3 (J,K) = (1,1) and (2,2) inversiontransitions towards OMC1 in Orion A obtained by the Karl G. Jansky Very LargeArray (VLA) and the 100 m Robert C. Byrd Green Bank Telescope (GBT). With anangular resolution of 6" (0.01 pc), these observations reveal withunprecedented detail the complex filamentary structure extending north of theactive Orion BN/KL region in a field covering 6' x 7'. We find a 0.012 pc widefilament within OMC1, with an aspect ratio of ~37:1, that was missed inprevious studies. Its orientation is directly compared to the relativeorientation of the magnetic field from the James Clerk Maxwell Telescope BISTROsurvey in Orion A. We find a small deviation of ~11 deg between the meanorientation of the filament and the magnetic field, suggesting that they arealmost parallel to one another. The filament's column density is estimated tobe 2-3 orders of magnitude larger than the filaments studied with Herschel andis possibly self-gravitating given the low values of turbulence found. Wefurther produce maps of the gas kinematics by forward modeling the hyperfinestructure of the NH3 (J,K) = (1,1) and (2,2) lines. The resulting distributionof velocity dispersions peaks at ~0.5 km/s, close to the subsonic regime of thegas. This value is about 0.2 km/s smaller than previously measured insingle-dish observations of the same region, suggesting that higher angular andspectral resolution observations will identify even lower velocity dispersionsthat might reach the subsonic turbulence regime in dense gas filaments.

Dense gas kinematics and a narrow filament in the Orion A OMC1 region using NH3