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We provide a first look at the results of the Herschel Gould Belt surveytoward the IC5146 molecular cloud and present a preliminary analysis of thefilamentary structure in this region. The column density map, derived from our70-500 micron Herschel data, reveals a complex network of filaments, andconfirms that these filaments are the main birth sites of prestellar cores. Weanalyze the column density profiles of 27 filaments and show that theunderlying radial density profiles fall off as r^{-1.5} to r^{-2.5} at largeradii. Our main result is that the filaments seem to be characterized by anarrow distribution of widths having a median value of 0.10 +- 0.03 pc, whichis in stark contrast to a much broader distribution of central Jeans lengths.This characteristic width of ~0.1 pc corresponds to within a factor of ~2 tothe sonic scale below which interstellar turbulence becomes subsonic in diffusegas, supporting the argument that the filaments may form as a result of thedissipation of large-scale turbulence.

Characterizing interstellar filaments with Herschel in IC5146