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Paper detail

Time Variation of Rotation Measure Gradient in 3C 273 Jet

The existence of a gradient in the Faraday rotation measure (RM) of the quasar 3C 273 jet is confirmed by follow-up observations. A gradient transverse to the jet axis is seen for more than 20 mas in projected distance. Taking account of the viewing angle, we estimate it to be more than 100 pc. Comparing to the distribution of the RM in 1995, we detect a time variation of it at the same distance from the core over 7 yr. We discuss the origin of the Faraday rotation based on this rapid time variation. We rule out foreground media such as a narrow-line region, and suggest a helical magnetic field in the sheath region as the origin of this gradient of the RM.

preprint2008arXivOpen access
Keiichi AsadaMakoto InoueSeiji KamenoHiroshi Nagai
astro-ph
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Keiichi AsadaMakoto InoueSeiji KamenoHiroshi Nagai

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