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		| Paper: | 
		In Search of Evidence for Toroidal B Fields Associated with the Jets of AGN | 
	 
	
		| Volume: | 
		340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA | 
	 
	
		| Page: | 
		72 | 
	 
	
		| Authors: | 
		Gabuzda, D.C.; Murray, E. | 
	 
	
	
		| Abstract: | 
		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.  | 
	 
	
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