Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934906s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #349.06
Astronomy and Astrophysics
Astronomy
Scientific paper
The Rosette Nebula is an excellent candidate for studies of super bubbles associated with stellar associations. We made linear polarization measurements of background radio sources with the Expanded Very Large Array (EVLA) to explore the properties of the prominent stellar bubble associated with the Rosette Nebula. We report the results of Faraday rotation measurements of 23 extra-galactic radio sources whose lines of sight pass through or close to the Rosette Nebula. The observations were made at 4.4GHz, 4.9GHz, and 7.6GHz. We are able to establish a background rotation measure due to the galactic plane in the vicinity of the Rosette Nebula of 140 rad/m2. Sources whose lines of sight pass through the nebula have an excess rotation measure of 300 -700 rad/m2, which we attribute to the plasma shell of the Rosette Nebula. We discuss two simple plasma shell models that can account for the magnitude 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. This research was supported at the University of Iowa by grant AST09-56901 from the National Science Foundation.
Fischer P. D.
Savage Allison H.
Spangler Steven R.
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