Magnetic Field Geometry in "Red" and "Blue" BL Lacs

Details Magnetic Field Geometry in "Red" and "Blue" BL Lacs Magnetic Field Geometry in "Red" and "Blue" BL Lacs

2003-01-06

arxiv.org/abs/astro-ph/0301068v1

Astrophys.Space Sci. 288 (2003) 51-61

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures, Proceedings of the Amsterdam workshop on "Circular polarisation from relativistic jet sources", to be pub

Scientific paper

10.1023/B:ASTR.0000004993.84117.

We compare the systematics of the magnetic field geometry in the "red" low-energy peaked BL Lacs (LBLs) and "blue" high-energy peaked BL Lacs (HBLs) using VLBI polarimetric images. The LBLs are primarily "radio--selected" BL Lacs and the HBLs are primarily "X-ray selected". In contrast to the LBLs, which show predominantly transverse jet magnetic fields, the HBLs show predominantly longitudinal fields. Thus, while the SED peaks of core-dominated quasars, LBLs and HBLs form a sequence of increasing frequency, the magnetic field geometry does not follow an analogous sequence. We briefly investigate possible connections between the observed parsec-scale magnetic field structures and circular polarization measurements in the literature on various spatial scales.

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