VLBI multi-epoch water maser observations toward massive protostars

Details VLBI multi-epoch water maser observations toward massive protostars VLBI multi-epoch water maser observations toward massive protostars

2012-04-17

arxiv.org/abs/1204.3811v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Submitted to Proceedings of IAU Symposium No. 287, Cosmic Masers- from OH to Ho

Scientific paper

VLBI multi-epoch water maser observations are a powerful tool to study the gas very close to the central engine responsible for the phenomena associated with the early evolution of massive protostars. In this paper we present a summary of the main observational results obtained toward the massive star-forming regions of Cepheus A and W75N. These observations revealed unexpected phenomena in the earliest stages of evolution of massive objects (e.g., non-collimated "short-lived" pulsed ejections in different massive protostars), and provided new insights in the study of the dynamic scenario of the formation of high-mass stars (e.g., simul- taneous presence of a jet and wide-angle outflow in the massive object Cep A HW2, similar to what is observed in low-mass protostars). In addition, with these observations it has been possible to identify new, previously unseen centers of high-mass star formation through outflow activity.

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