Abstract
In light of the newly detected proper motions in two lobes of the gigahertz-peaked spectrum source OQ 208, we introduced the Doppler effect into the fit to the observed spectral turnovers. It shows that two models containing the same beaming parameters but having quite different absorption mechanisms can fit two lobes equally well. In one model, only FFA (free-free absorption) is needed. In the other model, both the SSA (synchrotron self-absorption) in two lobes and an extra FFA toward the southwest lobe are required. Our analysis cannot unambiguously distinguish between two models. Although the FFA process is invoked in both models, the geometry of the absorbing gas could be quite different. However, the beaming effects in both models are eventually the same, with an intrinsically symmetrical advance speed of ≈0.33c for the two-sided lobes and an inclination angle of ≈33° for the radio jet emission to the observer's line of sight.
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