Fragmentation and kinematics in high-mass star formation

Context. The formation of high-mass star-forming regions from their parental gas cloud and the subsequent fragmentation processes lie at heart star research. Aims. We aim to study dynamical properties very early evolutionary stages formation. Methods. Employing NOrthern Extended Millimeter Array IRAM 30 m telescope, we observed two young regions, ISOSS22478 ISOSS23053, in 1.3 mm continuum spectral line emission a high angular resolution (~0.8?). Results. resolved 29 cores that are mostly located along filament-like structures. Depending on temperature assumption, these follow mass-size relation approximately M ? r 2.0 ± 0.3 , corresponding constant mean column densities. However, with different assumptions, steeper up 3.0 0.2 which would be more likely correspond volume densities, cannot ruled out. correlation core masses nearest neighbor separations is consistent thermal Jeans fragmentation. found hardly any spatial limit, indicating data resolve large-scale well. Although kinematics appear first sight – multiple velocity components filaments versus steep gradient than 50 km s ?1 pc ISOSS23053 findings can all explained within framework collapse scenario. Conclusions. While our scenario fragmentation, importance additional environmental properties, such as magnetization or external shocks triggering converging flows, nonetheless not well constrained require future investigation.