Grain growth and chemical composition in G14.225-0.506

The formation process of stellar cluster requires a high degree of cloud fragmentation. Both simulations and observations show that cloud fragmentation leading to the formation of stellar cluster is controlled by a complex interaction of gravitational instability, turbulence, magnetic fields, cloud rotation, and stellar feedback. The infrared dark cloud G14.225-0.506 hosts two hubs harbouring two deeply embedded protoclusters. All derived physical properties (density and temperature structures, level of turbulence, cloud rotation, and magnetic field strength) are remarkably similar despite they present different levels of fragmentation. The aim of this project is to investigate whether the different fragmentation is due to evolutionary effects and/or due to the external UV radiation field. This will be done by analysing observations from the Submillimter Array (SMA) at 1mm and from the NOEMA interferometer at 3 mm. The continuum emission, by means of the spectral index, can be related to grain growth of dust, while the chemical composition of the clusters members provides information on the evolutionary stage and the physical conditions.