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We provide a new view on the Cygnus-X north complex by accessing for thefirst time the low mass content of young stellar populations in the region.CFHT/WIRCam camera was used to perform a deep near-IR survey of this complex,sampling stellar masses down to ~0.1 M$_\odot$. Several analysis tools,including a extinction treatment developed in this work, were employed toidentify and uniformly characterise a dozen unstudied young star clusters inthe area. Investigation of their mass distributions in low-mass domain revealeda relatively uniform log-normal IMF with a characteristic mass of 0.32$\pm$0.08M$_\odot$ and mass dispersion of 0.40$\pm$0.06. In the high mass regime, theirderived slopes showed that while the youngest clusters (age < 4 Myr) presentedslightly shallower values with respect to the Salpeter's, our older clusters (4Myr < age < 18 Myr) showed IMF compliant values and a slightly denser stellarpopulation. Although possibly evidencing a deviation from an 'universal' IMF,these results also supports a scenario where these gas dominated young clustersgradually 'build up' their IMF by accreting low-mass stars formed in theirvicinity during their first ~3 Myr, before the gas expulsion phase, emerging atthe age of ~4 Myr with a fully fledged IMF. Finally, the derived distances tothese clusters confirmed the existence of at least 3 different star formingregions throughout Cygnus-X north complex, at distances of 500-900 pc, 1.4-1.7kpc and 3.0 kpc, and revealed evidence of a possible interaction between someof these stellar populations and the Cygnus-OB2 association.

Young and embedded clusters in Cygnus-X: evidence for building up the IMF?