文章基本信息

标题：AU-scale collimation of protostellar outflows from water masers
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作者：J.F. Desmurs, C.,Codella ; J. Santiago-Garcia ; M. Tafalla 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2006
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We conducted a study of water masers at 22.2 GHz around the Class 0 protostars called A and B in the NGC1333-IRAS 4 star forming region. Using the VLBA, we observed water emission at milliarcsecond scale and in phase referencing over four epochs spaced by one month to measure proper motions. The observations confirmed the high variability of H2O maser emission, shorter than one month. The high angular resolution allowed us to show that A2, the weakest source of the IRAS 4A binary system, is associated with water masers. On the other hand, the spots associated with IRAS 4B show a high degree of collimation down to 25 AU and they are probably tracing the protostellar jet producing a bipolar molecular outflow.