Protostellar Outflows at the EarliesT Stages (POETS). III. H2O masers tracing disk-winds and jets near luminous YSOs

摘要: The goal of the Protostellar Outflows at EarliesT Stages (POETS) survey is to image disk-outflow interface on scales 10-100 au in a statistically significant sample (36) luminous young stellar objects (YSO), targeting both molecular and ionized components outflows. outflow kinematics studied milliarcsecond through VLBI observations 22 GHz water masers. We employed JVLA 6, 13, A- B-Array configurations determine spatial structure spectral index radio continuum emission. In about half targets, masers observed separation <= 1000 from YSOs trace either or these kinematic structures: 1) spatially elongated distribution oriented close angle with direction collimation maser proper motions (PM), 2) linear LSR velocity (Vlsr) gradient across YSO position. (1) readily interpreted terms protostellar jet, as confirmed some targets via comparison independent jets, thermal (continuum line) emissions, reported literature. (2) disk-wind (DW) seen almost edge-on basis several pieces evidence: first, it invariably directed perpendicular jet; second, agrees orientation polarity Vlsr emissions (when literature) identifying disk 1000~au; third, PMs delineating gradients hint flow speed 10-20 km/s large angles midplane. remaining are not collimated but rather tend align along two directions, could originate DW-jet systems slightly inclined (<= 30 deg) respect edge-on.