Non-Uniform Free-Free Absorption in the GPS Radio Galaxy 0108+388
  We have observed the canonical gigahertz-peaked spectrum source 0108+388 with the VLBA at a range of frequencies above and below the spectral peak. The activity that dominates the radio emission from 0108+388, which is also classified as a Compact Symmetric Object, is thought to be less than 1000 years old. We present strong evidence that the spectral turnover in 0108+388 results from free-free absorption by non-uniform gas, possibly in the form of a disk in the central tens of parsecs. 
J. M. Marr (Union College), G. B. Taylor (NRAO), F. Crawford (MIT)