VSOP monitoring of the compact BL Lac object AO 0235+164
  In 1999, the highly compact and variable BL Lac object AO 0235+164 was identified as the highest brightness temperature active galactic nucleus observed with the VLBI Space Observatory Programme (VSOP), with T_B > 5.8 x 10^{13} K. The sub-milliarcsecond radio structure of this source has been studied with dual-frequency (1.6 and 5 GHz), polarization-sensitive VSOP observations during 2001 and 2002. Here we present the results of this monitoring campaign. At the time of these observations, the source was weakly polarized and characterized by a radio core that is clearly resolved on space-ground baselines. 
S. Frey (FOMI SGO), L.I. Gurvits (JIVE), D.C. Gabuzda (U. College   Cork), C.J. Salter, D.R. Altschuler, P. Perillat (NAIC A...