Opacity in the jet of 3C309.1

Details Opacity in the jet of 3C309.1 Opacity in the jet of 3C309.1

2001-10-25

arxiv.org/abs/astro-ph/0110542v1

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures, 4 tables, needs ivs2e.cls. To be published in: A. Rius and D. Behrend (Eds.): Proceedings of the 15th Work

Scientific paper

The "core" of a radio source is believed to mark the frequency-dependent location where the optical depth to synchrotron self--absorption tau_s~1. The frequency dependence can be used for derive physical conditions of the radio emitting region and the ambient environment near the central engine of the radio source. In order to test and improve the models to derive this information, we made multi-frequency dual-polarization observations of 3C309.1 in 1998.6, phase-referenced to the QSOs S5 1448+76 and 4C72.20 (S5 1520+72) (4d26' and 1d49' away, respectively). We present here preliminary results from these observations: total and polarized intensity maps, spectral information deduced from these images, and the relative position of 3C309.1 with respect to S5 1448+76 at different frequencies. Finally, we discuss briefly the observed shift of the core position.

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