Probing the Rosette Nebula Stellar Bubble with Faraday Rotation

Abstract

We report the results of Faraday rotation measurements of 23 background radio sources whose lines of sight pass through or close to the Rosette Nebula. The Rosette Nebula is an excellent candidate for studies of super bubbles associated with young star clusters. We made linear polarization measurements with the Karl G. Jansky Very Large Array (JVLA) at frequencies of 4.4GHz, 4.9GHz, and 7.7GHz. We are able to establish a background rotation measure in this part of the sky due to the Galaxy of +147 rad m^-2. Sources whose lines of sight pass through the nebula have an excess rotation measure of 50-750 rad m^-2, which we attribute to the plasma shell of the Rosette Nebula. We consider two simple plasma shell models and how they reproduce the magnitude and sign of the rotation measure, and its dependence on distance from the center of the nebula. These two models represent different modes of interaction of the Rosette Nebula star cluster with the surrounding interstellar medium. Both can reproduce the magnitude and spatial extent of the rotation measure enhancement, given plausible free parameters. We contend that the model based on a stellar bubble more closely reproduces the observed dependence of rotation measure on distance from the center of the nebula.

10 figures

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• Planck intermediate results. XXXIV. The magnetic field structure in the Rosette Nebula
• A compiled catalog of rotation measures of radio point sources
• A Faraday Rotation Study of the Stellar Bubble and HII Region Associated with the W4 Complex
• Denser Sampling of the Rosette Nebula with Faraday Rotation Measurements: Improved Estimates of Magnetic Fields in HII Regions
• The JCMT BISTRO-2 Survey: The Magnetic Field in the Center of the Rosette Molecular Cloud
• The Emission Nebula Sh 2-174: A Radio Investigation of the Surrounding Region