Paper:	Detecting Infall in High-Mass Protostellar Objects
Monograph:	7, Science with a Next Generation Very Large Array
Page:	293
Authors:	Beltrán, M. T.; Zhang, Q.; Rivilla, V. M.
Abstract:	Red-shifted molecular absorption against a bright background continuum source is the clearest way of diagnosing infall and accretion in high-mass star-forming regions. Up to now, red-shifted absorption at centimeter wavelengths has been only detected toward the brightest ultracompact and hyper compact (UC/HC) HII regions with limited angular resolution and sensitivity. The high sensitivity and angular resolution of the ngVLA will allow us to detect several NH3 inversion transitions with a wide range of excitation energies (∼20 K to 2000 K) in red-shifted absorption toward high-mass accretion disk candidates with luminosities >103 L☉, even for the faintest UC/HC HII regions. In particular, the ngVLA will detect infall toward massive stars shortly after the onset of an HII region at an angular resolution of 20 mas (∼100 au at the typical distances of high-mass protostars).

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