Interacting large-scale magnetic fields and ionized gas in the W50/SS433 system

摘要: The W50/SS433 system is an unusual Galactic outflow-driven object of debatable origin. We have used the Australia Telescope Compact Array (ATCA) to observe a new 198 pointing mosaic, covering $3^\circ \times 2^\circ$, and present highest-sensitivity full-Stokes data W50 date using wide-field, wide-band imaging over 2 GHz bandwidth centred at 2.1 GHz. also complementary H$\alpha$ mosaic created Isaac Newton Photometric Survey Northern Plane (IPHAS). magnetic structure found be consistent with prevailing hypothesis that nebula reanimated shell-like supernova remnant (SNR), has been re-energised by jets from SS433. strong depolarization effects correlate diffuse emission, likely due spatially-varying Faraday rotation measure (RM) fluctuations $\ge48$ 61 rad m$^{-2}$ on scales $\le4.5$ 6 pc. report discovery numerous, faint, filaments are unambiguously associated central region W50. These thin suggestive SNR's shock almost all radio counterpart. Furthermore, RM-gradient detected across W50, which we interpret as loop field symmetry axis offset $\approx90^{\circ}$ east-west jet-alignment axis, implying evolutionary processes both SNR must coupled. A separate termination in Eastern ear, ring-like located where jet interacts circumstellar medium. Future optical observations will able use probe kinematics shell potentially allowing for definitive experiment W50's formation history.