VLBA Observations of Strong Anisotripic Radio Scattering towards the
  Orion Nebula
  We present observations of VLBA 20, a radio source found towards the edge of
the Orion Nebula Cluster (ONC). Nonthermal emission dominates the spectral
energy distribution of this object from radio to mid-infrared regime,
suggesting that VLBA 20 is extragalactic. This source is heavily scattered in
the radio regime. Very Long Baseline Array observations resolve it to ~34x19
mas at 5 GHz, and the wavelength dependence of the scattering disk is
consistent with $\nu^{-2}$ at other frequencies. The origin of the scattering
is most likely the ionized X-ray emitting gas from the winds of the most
massive stars of the ONC. The scattering is highly anisotropic, with the axis
ratio of 2:1, higher than what is typically observed towards other sources.
