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Milliarcsecond Structure of the Faraday Effects in 3C 147: “The CSS Prototype with Highest Rotation Measure” (Which Is Not)

  • E. Lüdke (a1), W. D. Cotton (a2), H. S. Sanghera (a3) and D. Dallacasa (a4)

Abstract

We analyze polarization observations of 3C 147 at milliarcsecond scale which we have made with the VLBA at L, S, and C band and with the MERLIN array at K band. Several constraints placed by the observations on the physical conditions of the magnetoionic gas which produces the Faraday rotation are briefly discussed. Our data show that the Faraday rotation increases towards the VLBI core component with a maximum observed value of RM~ 4600±80 rad m−2. Such a value does not support the inclusion of 3C 147 as a source with exceedingly-high faraday rotation (SEFR), as suggested from published low-resolution observations.

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References

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Inoue, M., et al. 1995. PASJ, 47, 725737.
Kato, T., et al. 1987. Nature, 329, 223224.
Lüdke, E., et al. 1997, MNRAS, accepted.
Taylor, G.B., et al. 1990. ApJ, 260, 4154.
Taylor, G.B., Inoue, M., Tabara, H. 1992. A&A, 264, 421427.

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Milliarcsecond Structure of the Faraday Effects in 3C 147: “The CSS Prototype with Highest Rotation Measure” (Which Is Not)

  • E. Lüdke (a1), W. D. Cotton (a2), H. S. Sanghera (a3) and D. Dallacasa (a4)

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