Extended Data Fig. 2: Polarized intensity Faraday spectra for the two bursts.
From: A bright millisecond-duration radio burst from a Galactic magnetar
a, The Faraday spectrum FB1 for the first sub-burst from Stokes Q and U after correcting for a leakage between Stokes U and V. b, Faraday spectrum \({F}_{{\rm{B}}2}^{\ast }\) for the second sub-burst from a single polarized flux of the ARO 10-m dish. c, The cross spectrum Fcross = \(\sqrt{{F}_{{\rm{B}}1}{F}_{{\rm{B}}2}^{\ast }}\) from the ARO 10-m dish, magnified near the peak. d, The cross spectrum from CHIME intensity data. The oscillations of the Stokes Q from Faraday rotation have leaked to the summed intensity, owing to the different response of the two linear receivers in the far sidelobe. The black lines show the amplitude of the spectra; the blue and orange lines are the real and imaginary parts of the spectra, respectively. The phase of the cross spectrum corresponds to the PA difference between the two bursts. When the real part approaches the amplitude, the two bursts have the same PA. The yellow dashed vertical line is drawn at RM = 116 rad m−2. L is the linear polarization, I is the total intensity and their indices refer to the first and second bursts.
