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An increasing number of hundred-parsec scale, high line-mass filaments havebeen detected in the Galaxy. Their evolutionary path, including fragmentationtowards star formation, is virtually unknown. We characterize the fragmentationwithin the Nessie filament, covering size-scales between $\sim$ 0.1-100 pc. Wealso connect the small-scale fragments to the star-forming potential of thecloud. We combine near-infrared data from the VVV survey with mid-infraredGLIMPSE data to derive a high-resolution dust extinction map and apply awavelet decomposition technique on it to analyze the fragmentationcharacteristics of the cloud, which are compared with predictions fromfragmentation models. We compare the detected objects to those identified in$\sim$ 10 times coarser resolution from ATLASGAL data. We present ahigh-resolution extinction map of Nessie. We estimate the mean line-mass ofNessie to be $\sim$ 627 M$_\odot$/pc and the distance to be $\sim$ 3.5 kpc. Wefind that Nessie shows fragmentation at multiple size scales. Thenearest-neighbour separations of the fragments at all scales are within afactor of 2 of the Jeans' length at that scale. However, the relationshipbetween the mean densities of the fragments and their separations issignificantly shallower than expected for Jeans' fragmentation. Therelationship is similar to the one predicted for a filament that exhibits aLarson-like scaling between size-scale and velocity dispersion; such a scalingmay result from turbulent support. Based on the number of YSOs in Nessie, weestimate that the star formation rate is $\sim$ 371 M$_\odot$/Myr; similarvalues result if using the number of dense cores, or the amount of dense gas,as the proxy of star formation. The star formation efficiency is 0.017. Thesenumbers indicate that Nessie's star-forming content is comparable to the Solarneighborhood giant molecular clouds like Orion A.

Structure and Fragmentation of a high line-mass filament: Nessie