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The Origin of Complex Behavior of Linearly Polarized Components in Parsec-Scale Jets | | Philip A. Hughes
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26 Nov 2004 | | Journal: | Astrophys.J. 621 (2005) 635-642 | | Subject: | astro-ph | | Abstract: | Evidence that the magnetic fields of extragalactic jets have a significant fraction of their energy in a random component is briefly summarized, and a detailed model of evolving, jet polarization structures is constructed, based on this picture. The evolving magnetic field structure of an oblique shock complex that forms in a relativistic jet simulation is explored by using velocity data from the hydrodynamical simulation to advect an initially random magnetic field distribution. Radiative transfer calculations reveal that emission from a propagating region of magnetic field, `ordered’ by the shock, and lying approximately transverse to the flow direction, merges with that from an evolving sheared region at the flow periphery. If such a flow were barely resolved, observation would suggest evolution from a somewhat oblique, to a more longitudinal, magnetic field structure with respect to the flow axis, while higher resolution observations would infer a component following a non-linear trajectory, and with a magnetic field orientation that rotates during evolution. This result highlights the ambiguity in interpreting VLBP data, and illustrates the importance of simulations in providing a framework for proper interpretation of such data. | | Source: | arXiv, astro-ph/0411725 | | Services: | Forum | Review | PDF | Favorites | |
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