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The Rosette complex is a well studied region of the galactic plane whichpresents the apparent characteristics of a triggered star forming region. Thisis however still debated as no strong evidence corroborates this statement. Wefocus on characterizing the young stellar population in the Rosette complex toimprove our understanding of the processes that regulate the star formation inthis region. We propose an original method that relies on the joint analysis ofthe star color and density in the near-infrared. It leads to mapping themolecular cloud spatial distribution and detecting the embedded clusters withtheir characterization in terms of member number and age estimation. We haveidentified 13 clusters, 2 of which are new discoveries, and we estimate thatthe total number of young stellar objects in the Rosette ranges between 4000and 8000 members. We find that the age distribution of the young clusters isnot consistent with a general triggered scenario for the star formation in thismolecular cloud. This study proves that the Rosette complex evolution is notgoverned by the influence of its OB star population. It suggests that thesimple morphological appearance of an active region is not sufficient toconclude much about the triggering role in the star formation process. Ourmethod of constraining the cluster properties using UKIDSS and WISE data hasproven efficient, and studies of other regions of the galactic plane woulddefinitely benefit from this approach.

Young stellar clusters in the Rosette molecular cloud. Arguments against triggered star formation