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Sharpless 2-27 (Sh2-27) is a nearby ${\rm H\,{\small II}}$ region excited by$\zeta$Oph. We present observations of polarized radio emission from 300 to480$\,$MHz towards Sh2-27, made with the Parkes 64$\,$m Radio Telescope as partof the Global Magneto-Ionic Medium Survey. These observations have an angularresolution of $1.35^{\circ}$, and the data are uniquely sensitive tomagneto-ionic structure on large angular scales. We demonstrate that backgroundpolarized emission towards Sh2-27 is totally depolarized in our observations,allowing us to investigate the foreground. We analyse the results of Faradaytomography, mapping the magnetised interstellar medium along the 165$\,$pc pathto Sh2-27. The Faraday dispersion function in this direction has peaks at threeFaraday depths. We consider both Faraday thick and thin models for thisobservation, finding that the thin model is preferred. We further model this asFaraday rotation of diffuse synchrotron emission in the Local Bubble and in twoforeground neutral clouds. The Local Bubble extends for 80$\,$pc in thisdirection, and we find a Faraday depth of $-0.8 \pm 0.4\,$rad$\,$m$^{-2}$. Thisindicates a field directed away from the Sun with a strength of$-2.5\pm1.2\,\mu$G. The near and far neutral clouds are each about 30$\,$pcthick, and we find Faraday depths of $-6.6\pm0.6\,$rad$\,$m$^{-2}$ and$+13.7\pm0.8\,$rad$\,$m$^{-2}$, respectively. We estimate that theline-of-sight magnetic strengths in the near and far cloud are $B_{\parallel,\text{near}} \approx -15\,\mu\text{G}$ and $B_{\parallel, \text{far}} \approx+30\,\mu\text{G}$. Our results demonstrate that Faraday tomography can be usedto investigate the magneto-ionic properties of foreground features in front ofnearby ${\rm H\,{\small II}}$ regions.

monthly notices of the royal astronomical society

Through thick or thin: Multiple components of the magneto-ionic medium  towards the nearby ${\rm H\,{\small II}}$ region Sharpless 2-27 revealed by  Faraday tomography