Cosmic-ray driven outflow from the galactic center and the origin of
  magnetized radio filaments
  Radio, X-ray and infrared observations of the inner few hundred pc of the
Galactic center have highlighted two characteristics to the ISM. The cosmic ray
ionization rate derived from molecular ions such as H$^+_3$, is at least two to
three orders of magnitudes higher than in the Galactic disk. The other is
bipolar X-ray and radio emission away from the Galactic plane. These features
are consistent with a scenario in which high cosmic ray pressure drives
large-scale winds away from the Galactic plane. The interaction of such a wind
with stellar wind bubbles may explain the energetic nonthermal radio filaments
found throughout the Galactic center. Some of the implications of this scenario
is the removal of gas driven by outflowing winds, acting as a feedback to
reduce the star formation rate in the central molecular zone (CMZ), and the
distortion of azimuthal magnetic field lines in the CMZ to vertical direction
away from the plane. The combined effects of the wind and vertical magnetic
field can explain why most magnetized filaments run perpendicular to the
Galactic plane. This proposed picture suggests our Milky Way nucleus has
recently experienced starburst or black hole activity, as recent radio and
X-ray observations indicate.
