Interstellar Scintillation and Polarization of PSR B0656+14 in the Monogem Ring

Abstract High-sensitivity interstellar scintillation and polarization observations of PSR B0656+14 made at three epochs over a year using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) show that scattering is dominated by two different compact regions. We identify one nearer to pulsar with shell Monogem Ring, thereby confirming association. The other probably associated Local Bubble. find observed position angles spin axis spatial velocity are significantly different, separation 19.°3 ± 0.°8, inconsistent previously published near-perfect alignment 1° 2°. independent regions clearly defined in secondary spectra, which strong forward parabolic arcs. arc curvatures imply screens corresponding outer inner arcs located approximately 28 pc from 185 Earth, respectively. Comparison Doppler profiles electromagnetic simulations shows both mildly anisotropic. For arc, we estimate anisotropy A R be 1.3, irregularities aligned parallel velocity. compare delay computed theoretical strong-scattering model. Our results suggest spectrum Ring flatter than Kolmogorov, but further required confirm this.