Recent Observations and Theory of the Galactic Center Nonthermal Filaments

T. N. LaRosa1, S. N. Shore2,4, T. J. W. Lazio3, N. Kassim3, M. Nord3, R.Dahlburg3, G. Einuadi4

1 Kennesaw St. Univ., 1000 Chastain Rd. Kennesaw, GA 30144, USA
2 Indianna Univ. South Bend, 1700 Mishawaka Ave., South Bend, IN 46634 USA
3 Naval Research Laboratory, Washington, DC 20375 USA
4 Universita di Pisa, 56100 Pisa, Italy,

LaRosa, Lazio & Kassim, ApJ, 563, 163 (2001); Dahlburg et al, ApJ, 568, 220 (2002)

The structure of the Galactic Center magnetic field is mainly inferred from radio imaging of the nonthermal filaments (NTFs). Recent wide-field VLA imaging of the GC at 90 cm has revealed several new NTFs with different orientations relative to the Galactic plane. These results complicate the simple picture of largely uniform, perdendicular filaments that trace a globally ordered magnetic field. After reviewing the new observations we explore the possiblity that the NTFs are local, individual structures: magnetic wakes generated through the interaction of molecular clouds with a Galactic Center wind. Numerical simulations of NTF formation and evolution will be presented and compared with observations.

Tom Geballe