VLA H2O Maser Observations Towards High-Mass Protostellar Candidates

During the earliest phases of high-mass star formation, mass outflows play an important, yet poorly understood role. We have observed 23 high-mass protostellar candidates with previous indication for ionized jets in the 1.3 cm continuum and the 22 GHz H2O maser line, and present a survey which investigates the association of shocked gas with ionized jets. The observations were obtained with the VLA in the A-configuration, providing high sensitivity 1.3 cm continuum and H2O line data, with angular resolution of approximately 0.1 arcseconds. In this poster we present preliminary results, concentrating on the relation of the H2O masers to the ionized jets emanating from the high-mass protostellar candidates. This work is partially supported by NSF grants AST-1814011 (PH) and AST-1814063 (EA).