A VLA Survey of Magnetic Cataclysmic Variables: The First Radio Dectection of the High Field Polar, AR UMa

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We conducted a VLA survey of 9 magnetic cataclysmic variable stars (MCVs), in October 2003, with the aim of constraining models for radio emission mechanisms. All observations were conducted in the VLA X-band, to maximize sensitivity. Typical integration times were 20 minutes. We obtained the first detection of AR UMa, the MCV with the highest known magnetic field (230 MG), at a flux density of 0.52 +/- 0.03 mJy. Surprisingly, the only radio selected CV, FIRST 1023+0038, was not detected. An upper-limit of 0.20 mJy (4 sigma) was obtained. The original radio MCV, AM Herculis, was detected with a flux density of 0.72 +/- 0.04 mJy, a level consistent with the previous detections of the quiescent radio emission. Typical (4 sigma) upper-limits of 0.12 mJy were obtained for other targets. We present an outline of the current state of modeling radio emission and discuss the implications of this work on understanding the radio characteristics of MCVs.

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