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Title: Magnetic Field Geometry in `Red' and `Blue' BL Lacs
Authors: Kharb, P
Gabuzda, D. C
Shastri, P
Keywords: Magnetic Field Geometry;'Red' and `Blue' BL Lacs;VLBI Polarimetric Images
Issue Date: Oct-2003
Publisher: Springer
Citation: Astrophysics and Space Science, Vol. 288, No. 1, pp. 51 - 61
Abstract: 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.
Description: Restricted Access
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ISSN: 0004 - 640X
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