In Search of Evidence for Toroidal B Fields Associated with the Jets of AGN
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Evidence is mounting that many of the transverse jet B fields observed in BL Lac objects on parsec scales represent the dominant toroidal component of the intrinsic jet B fields. If this is the case, this may give rise to rotation-measure (RM) gradients across the jets, due to the systematic change in the line-of-sight component of the jet B field. We have found evidence for such RM gradients in several BL Lac objects. We discuss these new results, together with some of their implications for our understanding of the pc-scale jets of AGN.
5 pages, 2 figures; presented at the conference "Future Directions in High Resolution Astronomy: A Celebration of the 10th Anniversary of the VLBA", held June 8-12, 2003, in Socorro, New Mexico, USA; to be published in the ASP Conference Series
5 pages, 2 figures; presented at the conference "Future Directions in High Resolution Astronomy: A Celebration of the 10th Anniversary of the VLBA", held June 8-12, 2003, in Socorro, New Mexico, USA; to be published in the ASP Conference Series