Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-13
Astronomy and Astrophysics
Astrophysics
17 pages, including 8 figures. Proceedings of the 3rd Compact Steep Spectrum and GHz Peaked Spectrum Sources, 2002, Greece. Su
Scientific paper
10.1071/AS03037
We report Very-Long-Baseline Array (VLBA) observations at 2.3, 8.4, and 15.4 GHz towards nine GHz-Peaked Spectrum (GPS) sources. One Seyfert 1 galaxy, one Seyfert 2 galaxy, three radio galaxies, and four quasars were included in our survey. We obtained spatial distributions of the Free-Free Absorption (FFA) opacity with milliarcsec resolutions for all sources. It is found that type-1 (Seyfert 1 and quasars) and type-2 (Seyfert 2 and radio galaxies) sources showed different distributions of the FFA opacities. The type-1 sources tend to show more asymmetric opacity distributions towards a double lobe, while those of the type-2 sources are rather symmetric. Our results imply that the different viewing angle of the jet causes the difference of FFA opacity along the external absorber. This idea supports the unified scheme between quasars and radio galaxies, proposed by Barthel (1989).
Inoue Makoto
Kameno Seiji
Sawada-Satoh Satoko
Shen Zhi-Qinag
Wajima Kiyoaki
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