EPoS Contribution
EPoS Contribution
Deep investigation of high-mass star formation in the DR21(OH) clump - from large scales to small scales

Timea Csengeri
CEA, Service d'Astrophysique, Saclay, France
The DR21 filament - located in the Cygnus-X star forming region - is one of the closest site hosting high-mass star formation, where significant amount of the gas is concentrated at very high density. We focus on the close environment of one of it's densest part, the DR21(OH) clump, where we witness the birth of massive protostars. Both single dish (IRAM 30m) and interferometric data (IRAM PdBI) are used to probe the region from larger scales (1 pc) to smaller scales (0.01 pc). On the large scale the line profiles reveal complex kinematics, which makes it yet unclear whether it is a global stream of gas infalling towards the center of the filament or the contribution of the coalescence of 2 filaments which is responsible for the enhanced star formation activity. On the small scale we study the already fragmented individual cores, whose kinematic properties serve as a probe for different scenarios of high-mass star formation. We directly compare our results with MHD numerical simulations. Understanding the complexity of this particular field hosting high-mass star formation is a challenge for future studies, while it may also enable us to distinguish between core collapse and competitive accretion models and because it paves the way for high spatial resolution observations of more distant galactic objects with ALMA.