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VLBI multi-epoch water maser observations toward massive protostars

Published online by Cambridge University Press:  24 July 2012

José M. Torrelles ,
José F. Gómez ,
Nimesh A. Patel ,
Salvador Curiel ,
Guillem Anglada  and
Robert Estalella
José M. Torrelles
Affiliation:
ICE(CSIC)-UB/IEEC, Barcelona (Spain)
José F. Gómez
Affiliation:
IAA(CSIC), Granada (Spain)
Nimesh A. Patel
Affiliation:
Harvard-Smithsonian, CfA, Cambridge (USA)
Salvador Curiel
Affiliation:
IAUNAM, México D.F. (México)
Guillem Anglada
Affiliation:
IAA(CSIC), Granada (Spain)
Robert Estalella
Affiliation:
UB/IEEC, Barcelona (Spain)
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Abstract

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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., simultaneous 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.

Keywords

ISM: generalstars: formationISM: jets and outflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 377 - 385
Copyright
Copyright © International Astronomical Union 2012

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