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Fig. 5


(Left) Examples of combined ALMA and Mopra N2H+(1−0) spectra observed at some specific positions in SDC335 (upper panel for filaments − lower panel for cores), along with their best fits as red solid lines. The N2H+(1−0) spectra exhibit a hyperfine structure (HFS) composed of 7 components (the positions are displayed as blue vertical ticks for the F2 filament). Some of these components are close enough to be blended when the velocity dispersion of the gas is supersonic, resulting in three groups of lines. For a kinetic temperature of 10 K, the velocity dispersion along the filaments is supersonic by a factor 1.5 to 3, similar to what is observed in other IRDCs (Ragan et al. 2012). (Right) Schematic representation of the systemic velocity and velocity dispersion of the different structures. The length of each box represents the velocity dispersion (FWHM) of the gas, and its central position the systemic velocity (represented as a filled circle). The colour of the boxes codes the line that has been used for the measurements: red for N2H+(1−0), and cyan for CH3OH(13−12). The vertical dashed lines mark the systemic velocities of the cores.

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