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Dense Plasma Torus in the GPS Galaxy NGC 1052

Published online by Cambridge University Press:  05 March 2013

Seiji Kameno
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka Tokyo, Japan, 181-8588. kameno@hotaka.mtk.nao.ac.jp, inoue@nao.ac.jp, kiyoaki@hotaka.mtk.nao.ac.jp
Makoto Inoue
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka Tokyo, Japan, 181-8588. kameno@hotaka.mtk.nao.ac.jp, inoue@nao.ac.jp, kiyoaki@hotaka.mtk.nao.ac.jp
Kiyoaki Wajima
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka Tokyo, Japan, 181-8588. kameno@hotaka.mtk.nao.ac.jp, inoue@nao.ac.jp, kiyoaki@hotaka.mtk.nao.ac.jp
Satoko Sawada-Satoh
Affiliation:
The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara Kanagawa, Japan, 229-8510. satoko@vsop.isas.ac.jp, zshen@asiaa.sinica.edu.tw
Zhi-Qiang Shen
Affiliation:
The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara Kanagawa, Japan, 229-8510. satoko@vsop.isas.ac.jp, zshen@asiaa.sinica.edu.tw
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Abstract

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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.

Type
GPS/CSS Workshop
Copyright
Copyright © Astronomical Society of Australia 2003

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