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The Rosette molecular cloud is promoted as the archetype of a triggeredstar-formation site. This is mainly due to its morphology, because the centralOB cluster NGC 2244 has blown a circular-shaped cavity into the cloud and theexpanding HII-region now interacts with the cloud. Studying the spatialdistribution of the different evolutionary states of all star-forming sites inRosette and investigating possible gradients of the dust temperature will helpto test the 'triggered star-formation' scenario in Rosette. We use continuumdata obtained with the PACS (70 and 160 micron) and SPIRE instruments (250,350, 500 micron) of the Herschel telescope during the Science DemonstrationPhase of HOBYS. Three-color images of Rosette impressively show how themolecular gas is heated by the radiative impact of the NGC 2244 cluster. Aclear negative temperature gradient and a positive density gradient (runningfrom the HII-region/molecular cloud interface into the cloud) are detected.Studying the spatial distribution of the most massive dense cores (size scale0.05 to 0.3 pc), we find an age-sequence (from more evolved to younger) withincreasing distance to the cluster NGC 2244. No clear gradient is found for theclump (size-scale up to 1 pc) distribution. The existence of temperature anddensity gradients and the observed age-sequence imply that star formation inRosette may indeed be influenced by the radiative impact of the central NGC2244 cluster. A more complete overview of the prestellar and protostellarpopulation in Rosette is required to obtain a firmer result.

The Herschel view of star formation in the Rosette molecular cloud under the influence of NGC 2244