Speaker
Description
The transition from cold, dense gas to high-mass protostars involves complex physical processes that occur at various scales. In this contribution, we present new Submillimeter Array (SMA) 1.3 mm continuum and molecular line observations of the G14.225–0.506 hub–filament system, designed to characterize the physical evolution and fragmentation of its protostellar cores. At the angular resolution of our SMA data, we identify a clear differentiation in the fragmentation properties of the two main hubs: two massive cores in the northern hub (G14.2-N) and four in the southern hub (G14.2-S). Our SMA 1.3 mm continuum maps reveal that despite the lower fragmentation level, G14.2-N hosts a significantly more evolved and chemically rich hot core. Furthermore, the SMA molecular line survey allows us to detect and map active outflows through a broad range of tracers (including CH?OH, CS, SiO, SO, H?CO, and CO). We show that while molecular emission is closely associated with the strongest continuum peaks, in several regions it is dominated by outflowing gas, highlighting the role of internal feedback in shaping the dense gas. These results, obtained with the SMA, provide a high-resolution view of the evolutionary sequence within the cloud, moving from the younger southern hub to the more evolved and feedback-dominated northern hub.
