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Filaments play a central role in the molecular clouds' evolution, but theirinternal dynamical properties remain poorly characterized. To further explorethe physical state of these structures, we have investigated the kinematicproperties of the Musca cloud. We have sampled the main axis of thisfilamentary cloud in $^{13}$CO and C$^{18}$O (2--1) lines using APEXobservations. The different line profiles in Musca shows that this cloudpresents a continuous and quiescent velocity field along its $\sim$6.5 pc oflength. With an internal gas kinematics dominated by thermal motions (i.e.,$\sigma_{NT}/c_s\lesssim1$) and large-scale velocity gradients, these resultsreveal Musca as the longest velocity-coherent, sonic-like object identified sofar in the ISM. The transonic properties of Musca present a clear departurefrom the predicted supersonic velocity dispersions expected in the Larson'svelocity dispersion-size relationship, and constitute the first observationalevidence of a filament fully decoupled from the turbulent regime overmulti-parsec scales.

The Musca cloud: A 6 pc-long velocity-coherent, sonic filament