Evolution of Magnetic Fields in High Mass Star Formation: Linking field geometry and collapse for the W51 e2/e8 cores

Evolution of Magnetic Fields in High Mass Star Formation: Linking field geometry and collapse for the W51 e2/e8 cores Ya-Wen Tang Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan & Academia Sinica Institute of Astronomy and Astrophysics, P. B. Box 23-141, Taipei 10617,Taiwan Paul T. P. Ho Academia Sinica Institute of Astronomy and Astrophysics, P. B. Box 23-141, Taipei 10617,Taiwan & Harvard-Smithsonian Center for Astrophysics,60 Garden Street Cambridge, MA 02138, U.S.A. Patrick M. Koch Academia Sinica Institute of Astronomy and Astrophysics, P. B. Box 23-141, Taipei 10617,Taiwan Josep M. Girart Institut de Ciències de l’Espai (CSIC-IEEC), Campus UAB, Facultat de Ciencies, Torre C5 parell 2, 08193 Bellaterra, Catalunya, Spain Shih-Ping Lai Academia Sinica Institute of Astronomy and Astrophysics, P. B. Box 23-141, Taipei 10617,Taiwan & Institute of Astronomy and Department of Physics, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu, Taiwan 300, R. O. C. Ramprasad Rao Submillimeter Array, Academia Sinica Institute of Astronomy and Astrophysics, 645 N. Aohoku P1, HI 9672, USA