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Cambridge University Press (CUP), Publications of the Astronomical Society of Australia, 1(20), p. 134-139, 2003

DOI: 10.1071/as03003

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Dense Plasma Torus in the GPS Galaxy NGC 1052

Journal article published in 2003 by Seiji Kameno, Makoto Inoue, Kiyoaki Wajima ORCID, Satoko Sawada-Satoh, Zhi-Qiang Shen
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

AbstractWe 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.

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