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Proper motions of water masers: W 51 North, Main, and South

  • Hiroshi Imai (a1), Tetsuo Sasao (a1), Osamu Kameya (a1), Teruhiko Watanabe (a2), Toshihiro Omodaka (a2), Masanori Nishio (a2), Yoshiharu Asaki (a3) and Jun-Ichi Nakajima (a4)...

Abstract

We describe the proper motion measurements of water masers in the massive-star forming region W 51A and the analysis of the 3-D kinematics in three maser clusters of W 51A. We found a systematic expanding motion in one of the clusters named W 51 North, while no systematic motion was detected in other two clusters named W 51 Main and South. The 3-D motions of the clusters relative to the position reference feature in W 51 North indicate a separating motion between the W 51 North and the W 51 Main/South clusters. We estimated the distance to W 51 North as to be 6.7±2.1 kpc on basis of the statistical parallax and the model fitting methods.

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References

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Gaume, R.A., Johnston, K.J., & Wilson, T.L. 1993, ApJ, 417, 645
Genzel, R., et al. 1981, ApJ, 248, 1039
Gwinn, C.R., Moran, J.M., & Reid, M.J. 1992, ApJ, 393, 149
Leppänen, K., Liljeström, T., & Diamond, P.J. 1998, ApJ, 507, 1998
Schneps, M.H., et al. 1981, ApJ, 249, 124

Proper motions of water masers: W 51 North, Main, and South

  • Hiroshi Imai (a1), Tetsuo Sasao (a1), Osamu Kameya (a1), Teruhiko Watanabe (a2), Toshihiro Omodaka (a2), Masanori Nishio (a2), Yoshiharu Asaki (a3) and Jun-Ichi Nakajima (a4)...

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