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Paper: Understanding the Origin of Bright Features
Volume: 386, Extragalactic Jets: Theory and Observation from Radio to Gamma Ray
Page: 429
Authors: Swift, C.M.; Hughes, P.A.
Abstract: New, more sophisticated simulations of relativistic flows lead to large, complex data sets that represent the physical conditions within the flow. Generally, simulated radio maps generated from these datasets have not been carefully analyzed to maximize our understanding of how the physical conditions in the flow lead to the formation of bright radio features. We have developed a methodology for recording and then analyzing the physical conditions encountered by a given line of sight through the simulated jet. This method consists of three steps. We first perform a relativistic hydrodynamic simulation. we then use this simulation to generate simulated flux maps employing several thousand lines of sight. Based on the features in the map we select lines of sight and analyze, as a function of retarded time along these lines, the various factors that may have affected their intensity. Using this analysis we can understand what combination of events leads to the formation of individual bright features. The contributions of both relativistic effects and flow conditions can be seen. We show that both angle of view, which determines boost, and time-delay effects have a major impact on the jet’s morphology and the location of bright features. This method’s highly visual nature allows for a straight forward analysis of radio features arising from a complex flow, leading to a better understanding of the relationship between the physical flow and the radio map flux of relativistic jets.
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