Density scaling relation in Orion A: effects of region selection
  Recently Stanchev et al. (2015) proposed a technique to derive density
scaling relations in a star-forming region from analysis of the probability
distribution function of column density. We address the possible dependence of
the outcome on the selection of probe zones, applying the method to Planck
dust-opacity data on Orion A. The derived steep scaling relation of mean
density with index -1.6 in the molecular cloud (so called `Central filament')
points to its self-gravitating nature. The result is reproduced also for large
parts of the clouds' vicinity which indicates major role of gravity in the
energy balance of the entire star-forming region.
