Broadband polarimetry of 3C 109. The black points are from Goodrich & Cohen (1992), and the blue data are from our analysis. All data points were measured using a 2″ aperture. The top panel shows the total (filled squares) and polarized (empty squares) intensities as a function of wavelength. Power laws were fit to the total (black) and polarized (gray) intensities. The photon index α of each power law is indicated in the graph. The continuum linear polarization degrees (in percent) are shown in the middle panel, and the associated polarization position angles are shown in the bottom panel.