your ID: 0046 
First Name: WenFeng 
Last Name: Luo 
Affiliation: Urumqi Astronomical Observatory 

Title: Seven-frequency VLBI observations of the GHz-Peaked-Spectrum source OQ208
Authors: Luo Wenfeng
Topic: 1 
Session: Poster 
Abstract: We present results of simultaneous Very Long Baseline Array (VLBA) observations 
of a GHz-Peaked-Spectrum (GPS) radio source OQ208 at 1.4, 1.7, 2.3, 5.0, 6.7, 8.4 and 15.4 GHz. 
The muti-frequency observation exhibits a high quality component spectrum. We introduce the 
Doppler effect into the fit to the observed spectral turnovers, both the SSA (synchrotron self-absorption) 
in two lobes and an extra FFA (free-free absorption) toward the south-west lobe required.