2005PASJ...57..295N

We present images from VSOP (VLBI Space Observatory Programme) and VLBA (Very Long Baseline Array) observations of the active galactic nuclei J1733-1304, J1625-2527, and J1015+4926. These three sources have been identified as possible counterparts to gamma-ray sources in the third EGRET catalog. In general, the counterparts to extragalactic EGRET sources have very compact structure, with brightness temperatures (T_b) greater than 10¹¹ - 10¹² K. Evidence for compactness in gamma-ray emitting AGNs is also given by the variability seen from gamma-ray to radio frequencies. In this report, we compare the images of the three sources with previously published images and also examine jet motions and spectral indices. The measured T_b of J1733-1304 are an order of magnitude lower than previous T_b of 1995-1997. The relatively low T_b of J1625-2527 is also consistent with the highly variable nature of this source. A comparison of the VSOP observation of J1015+4926 with a VLBA image made 2.2yr earlier suggests the existence of stationary jet components in this source.