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We present total-intensity and polarized-intensity images of the Cygnus Loopsupernova remnant (SNR) observed by the Five-hundred-meter Aperture Sphericalradio Telescope (FAST). The high angular-resolution and high-sensitivity imagesenable us to thoroughly compare the properties of the northern part with thesouthern part of the SNR. The central filament in the northern part and thesouthern part have a similar foreground rotation measure, meaning theirdistances are likely similar. The polarization analysis indicates that therandom magnetic field is larger than the regular field in the northern part,but negligible in the southern part. The total-intensity image is decomposedinto components of various angular scales, and the brightness-temperaturespectral index of the shell structures in the northern part is similar to thatin the southern part in the component images. All these evidence suggest thatthe northern and southern part of the Cygnus Loop are situated and thus evolvedin different environments of interstellar medium, while belonging to the sameSNR.

New continuum and polarization observations of the Cygnus Loop with FAST II. Images and analyses