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Evidence for Toroidal B-Field Structures in BL Lac Objects

D. C. Gabuzda·E. Murray·P. Cronin
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Abstract

If the transverse jet B fields observed in BL Lac objects on parsec scales represent the toroidal component of the jet B fields, this should give rise to rotation-measure 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 rotation-measure gradients in one-third to one-half of the 1 Jy BL Lac objects we have analyzed. We present and discuss these new results, together with some of their implications for our understanding of the parsec-scale jets of AGN.

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D. C. Gabuzda, E. Murray, P. Cronin. 2003-11-21. Evidence for Toroidal B-Field Structures in BL Lac Objects. https://arxiv.org/abs/astro-ph/0311504

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