
%0 Journal Article
%A Kameno, Seiji 
%A Inoue, Makoto 
%A Wajima, Kiyoaki 
%A Sawada-Satoh, Satoko 
%A Shen, Zhi-Qiang 
%T Dense Plasma Torus in the GPS Galaxy NGC 1052
%J Publications of the Astronomical Society of Australia
%D 2003/06/04
%V 20
%N 1
%P 134-139
%K Keywords: galaxies: active &#8212; galaxies: individual (NGC 1052, 0238&#8211;084) &#8212; galaxies: nuclei &#8212; galaxies: jets &#8212; radio continuum: galaxies &#8212; techniques: high angular resolution
%R https://doi.org/10.1071/AS03003
%U https://www.publish.csiro.au/paper/AS03003 
%X We report results from nearly simultaneous pentachromatic VLBI observations towards a nearby GPS galaxy NGC 1052. The observations at 1.6 and 4.8 GHz with the VSOP, and at 2.3, 8.4, and 15.4 GHz with VLBA, provide linear resolutions of &#126;0.1 pc. Convex spectra of a double-sided jet imply that synchrotron emission is obscured through foreground cold dense plasma, in terms of free&#8211;free absorption (FFA). We found a central condensation of the plasma which covers about 0.1 and 1 pc of the approaching and receding jets, respectively. A simple model with a geometrically thick plasma torus perpendicular to the jets is established to explain the asymmetric distribution of FFA opacities. 
