Ionized Accretion Flows in Massive Star Formation

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Scientific paper

Previous observations show that the hypercompact H II region W51e2 is surrounded by a massive molecular accretion flow associated with the formation of the young star or several stars now responsible for the ionization of the H II region. We present an analysis of radio recombination line observations of the ionized gas within the W51e2 H II region itself and of the CO line from the surrounding molecular gas. We find evidence for rotation and infall of ionized gas within the H II region consistent with accretion through the H II region, and we find evidence for an associated molecular bipolar outflow. The observed structure of the ionized and molecular accretion flows in and around W51e2 is similar to those associated with several other small H II regions. The similarities suggest an evolutionary phase in high-mass star formation in which a newly formed massive star or group of several stars first begins to ionize its own accretion flow.

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