Statistical Analysis of Water Masers in Star-Forming Regions: Cepheus A and W75 N

Details Statistical Analysis of Water Masers in Star-Forming Regions: Cepheus A and W75 N Statistical Analysis of Water Masers in Star-Forming Regions: Cepheus A and W75 N

2010-04-14

arxiv.org/abs/1004.2368v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

16 pages, 8 figures, and 3 tables. Accepted by The Astrophysical Journal

Scientific paper

We have done a statistical analysis of Very Long Baseline Array (VLBA) data of water masers in the star-forming regions (SFRs) Cepheus A and W75 N, using correlation functions to study the spatial clustering and Doppler-velocity distribution of these masers. Two-point spatial correlation functions show a characteristic scale size for clusters of water maser spots < or ~1 AU, similar to the values found in other SFRs. This suggests that the scale for water maser excitation tends to be < or ~1 AU. Velocity correlation functions show power-law dependences with indices that can be explained by regular velocity fields, such as expansion and/or rotation. These velocity fields are similar to those indicated by the water maser proper-motion measurements; therefore, the velocity correlation functions appear to reveal the organized motion of water maser spots on scales larger than 1 AU.

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