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We present a study of narrow filaments toward a massive infrared dark cloud,NGC 6334S, using the Atacama Large Millimeter/submillimeter Array (ALMA).Thirteen gas filaments are identified using the H$^{13}$CO$^{+}$ line, while asingle continuum filament is revealed by the continuum emission. The filamentspresent a compact radial distribution with a median filament width of$\sim$0.04 pc narrower than the previously proposed `quasi-universal' 0.1~pcfilament width. The higher spatial resolution observations and higher-densitygas tracer tend to identify even narrower and lower mass filaments. Thefilament widths are roughly twice the size of embedded cores. The gas filamentsare largely supported by thermal motions. The nonthermal motions arepredominantly subsonic and transonic in both identified gas filaments andembedded cores, which may imply that stars are likely born in environments oflow turbulence. A fraction of embedded objects show a narrower velocitydispersion compared with their corresponding natal filaments, which mayindicate that the turbulent dissipation is taking place in these embeddedcores. The physical properties (mass, mass per unit length, gas kinematics, andwidth) of gas filaments are analogous to those of narrow filaments found inlow- to high-mass star-forming regions. The more evolved sources are found tobe farther away from the filaments, a situation that may have resulted from therelative motions between the YSOs and their natal filaments.

ALMA observations of NGC 6334S. II. Subsonic and Transonic Narrow Filaments in a High-mass Star Formation Cloud