出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The e-VLBI technique offers a unique opportunity for users to probe the milliarcsecond (mas)
scale structure of unidentified radio sources, and organise quick follow-up observations in case of
detection. Here we report on e-EVN results for a peculiar radio source that has been suggested to
act as a gravitational lens. However the lensing galaxy has not been identified in the optical or the
IR bands so far. Our goal was to look for an active galactic nucleus (AGN) in this suspected dark
lens system. The results indicate strong AGN activity, and rule out the possibility that the radio
source itself is gravitationally lensed.
