Back to Volume
Paper: The Polarization Signatures of Old Planetary Nebulae in the Canadian Galactic Plane Survey
Volume: 438, The Dynamic Interstellar Medium: A Celebration of the Canadian Galactic Plane Survey
Page: 268
Authors: Ransom, R. R.; Kothes, R.; Landecker, T. L.; Wolleben, a. M.
Abstract: We present Canadian Galactic Plane Survey (CGPS) polarization images at 1420 MHz centered on two old planetary nebulae (PNe), Sh 2-216 and DeHt 5. Faraday rotation of the diffuse synchrotron background emission in the extended shells of these nebulae is readily observed in the polarization images. In the case of Sh 2-216, we use estimates of electron density and path length to derive the line-of-sight component of the magnetic field in the optically bright north-east portion of the nebula. We interpret our observations via a simple model which describes a deflected and slightly compressed interstellar field around Sh 2-216. In the case of the fast-moving (∼60 km s–1) DeHt 5, we focus on a tail of ionized gas, which starts at the back edge of DeHt 5 and runs away from the nebula in a direction roughly opposite that of the sky-projected space velocity. We believe this tail to be the signature of ionized material ram-pressure stripped first during an interaction between the asymptotic giant branch (AGB) progenitor and the interstellar medium (ISM) and more recently during an interaction between DeHt 5 and the ISM.
Back to Volume