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galaxies: individual (ngc 1052, 0238–084)

Publications of the Astronomical Society of Australia (1)

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Dense Plasma Torus in the GPS Galaxy NGC 1052
Seiji Kameno, Makoto Inoue, Kiyoaki Wajima, Satoko Sawada-Satoh, Zhi-Qiang Shen
Journal:

Publications of the Astronomical Society of Australia / Volume 20 / Issue 1 / 2003

Published online by Cambridge University Press:

05 March 2013, pp. 134-139
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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 ∼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–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.