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

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

2009-04-16

arxiv.org/abs/0904.2458v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 3 figures, to appear in Proceedings of Science, Proceedings of The 9th European VLBI Network Symposium on The role of

Scientific paper

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

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