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Modeling the Building Blocks of Water Masers in Cepheus A

Recent VLBA observations of water maser emission from the star-forming region Cepheus A have shown that this emission actually comes from a set of coherent features or “building blocks”. These building blocks are small linear structures of water maser spots that conform a larger configuration with a well-defined linear/arcuate shape. In small angular regions, the VLBA observations (Torrelles et al. 2001) show that: