Goddi, C.C.GoddiMOSCADELLI, LucaLucaMOSCADELLI0000-0002-8517-8881SANNA, ALBERTOALBERTOSANNA0000-0001-7960-49122022-12-202022-12-20201297811070328421743-9213http://hdl.handle.net/20.500.12386/32789We report multi-epoch VLBI observations of molecular masers towards the high-mass star forming region AFGL 5142, leading to the determination of the 3D velocity field of circumstellar molecular gas at radii <0.''23 (or 400 AU) from the protostar MM-1. Our observations of CH<SUB>3</SUB>OH maser emission enabled, for the first time, a direct measurement of infall of a molecular envelope on to an intermediate-mass protostar (radius of 300 AU, velocity of 5 km s<SUP>-1</SUP>, and infall rate of 6 × 10<SUP>-4</SUP> n <SUB>8</SUB> M <SUB>⊙</SUB> yr<SUP>-1</SUP>, where n <SUB>8</SUB> is the ambient volume density in units of 10<SUP>8</SUP> cm<SUP>-3</SUP>). In addition, our measurements of H<SUB>2</SUB>O maser (and radio continuum) emission revealed a collimated bipolar molecular outflow (and ionized jet) from MM-1. The evidence of simultaneous accretion and outflow at small spatial scales, makes AFGL 5142 an extremely compelling target for high-angular resolution studies of high-mass star formation.ELETTRONICOenConference paper10.1017/S17439213120073752-s2.0-84864441011https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/3d-velocity-fields-from-methanol-and-water-masers-in-an-intermediatemass-protostar/EBED20947FBED1EF47D9D8234C783C06#https://api.elsevier.com/content/abstract/scopus_id/848644410112012IAUS..287..401GFIS/05 - ASTRONOMIA E ASTROFISICA