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In extragalactic jets, the apparent position of the bright/narrow end (thecore) depends on the observing frequency, owing to synchrotron self-absorptionand external absorption. The effect must be taken into account in order toachieve unbiased results from multi-frequency VLBI data on AGN jets.Multi-frequency core shift measurements supplemented by other data enableestimating the absolute geometry and a number of fundamental physicalproperties of the jets and their environment. We have previously measured theshift between 13 and 3.6 cm in a sample of 29 AGNs to range between 0 and 1.4mas. In these proceedings, we present and discuss first results of ourfollow-up study using VLBA between 1.4 and 15.4 GHz.

Opacity in parsec-scale jets of active galactic nuclei: VLBA study from 1.4 to 15 GHz