Interferometric Monitoring of Gamma-ray Bright Active Galactic Nuclei
  II: Frequency Phase Transfer
  The Interferometric Monitoring of Gamma-ray Bright Active galactic nuclei
(iMOGABA) program provides not only simultaneous multifrequency observations of
bright gamma-ray detected active galactic nuclei (AGN), but also covers the
highest Very Large Baseline Interferometry (VLBI) frequencies ever being
systematically monitored, up to 129 GHz. However, observation and imaging of
weak sources at the highest observed frequencies is very challenging. In the
second paper in this series, we evaluate the viability of the frequency phase
transfer technique to iMOGABA in order to obtain larger coherence time at the
higher frequencies of this program (86 and 129 GHz) and image additional
sources that were not detected using standard techniques. We find that this
method is applicable to the iMOGABA program even under non-optimal weather
conditions.
