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Optical Polarization Mapping Toward the Interface Between the Local Cavity and Loop I
The Sun is located inside an extremely low density and quite irregularvolume of the interstellar medium, known as the Local Cavity (LC). Ithas been widely believed that some kind of interaction could beoccurring between the LC and Loop I, a nearby superbubble seen in thedirection of the Galactic center. As a result of such interaction, awall of neutral and dense material, surrounded by a ring-shaped feature,would be formed at the interaction zone. Evidence of this structure waspreviously observed by analyzing the soft X-ray emission in thedirection of Loop I. Our goal is to investigate the distance of theproposed annular region and map the geometry of the Galactic magneticfield in these directions. On that account, we have conducted an opticalpolarization survey of 878 stars from the Hipparcos catalog. Our resultssuggest that the structure is highly twisted and fragmented, showingvery discrepant distances along the annular region: ?100 pc on theleft side and 250 pc on the right side, independently confirming theindication from a previous photometric analysis. In addition, thepolarization vectors' orientation pattern along the ring also shows awidely different behavior toward both sides of the studied feature,running parallel to the ring contour on the left side and showing norelation to its direction on the right side. Altogether, these evidencessuggest a highly irregular nature, casting some doubt on the existenceof a unique large-scale ring-like structure.
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