Magnetic fields can be determined from the observations of the linear polarization of the radio continuum emission. The non-thermal radio emission, that is dominant at cm-wavelength, originates in the synchrotron emission process, a result of relativistic electrons being braked in magnetic fields when spiralling around the field lines. The emitted E polarization vector is perpendicular to the magnetic field. This linear polarization can suffer Faraday rotation by the passage through the magneto-ionic medium in the observed galaxy or in our own Galaxy. Faraday rotation increases with the square of observation wavelength which can be seen e.g. by comparing the  20cm and 6cm maps of M51. Depolarization can also affect the polarization vectors, especially near areas of rapid change of the polarization angle or of strong Faraday rotation (see M51 at 20cm). The ATLAS OF MAGNETIC FIELDS shows the radio continuum emission of nearby galaxies. Both total intensity and polarized intensity emission is shown. Ideally to trace the magnetic fields a full correction for the Faraday rotation should be applied. When observations have been made at a short radio wavelength (6cm or shorter) the measured E vectors can be rotated through 90 degrees to give the B vector orientation. In cases where full Faraday correction has been applied this is indicated by the title Magnetic field. In most of the galaxies shown in this sample the Faraday rotation is significant at wavelengths of 10cm or longer. The colour scales are arbitrary. Images of total radio intensity are presented in the 'rainbow' colour scale (blue to red, where blue indicates lowest intensities and red indicates highest intensities). Polarized intensities are shown in the 'heat' colour scale (red to white, where red indicates lowest intensities). The frequency of observation, the field size and the angular resolution of the telescope beam are given below each image. Links to original publications are also provided. Reproduction of any of these images requires permission from the MPIfR. FITS data files can be provided on request (for scientific purposes only).

Total Intensity I + B -Vectors	Polarized Intensity	References
IC342-East 20cm Tot Int+B-Vectors VLA Beam 50"	IC342-East 20cm Pol Int VLA Beam 50"
IC342-East 20cm Tot Int+B-Vectors VLA - D	IC342-East 20cm Pol Int VLA
IC342 20cm Tot Int+B-Vectors VLA C+D, 15"	IC342 20cm Pol Int VLA C+D, 15"
IC342 20cm Tot Int+B-Vectors VLA C+D, 30"	IC342 20cm Pol Int VLA C+D, 30"	IC342 20cm Pol Int+B-Vectors VLA C+D 30"
IC342 20cm Tot Int+B-Vectors VLA C+D,50"	IC342 20cm Pol Int VLA C+D,50"	IC342 20cm Pol Int+B-Vectors VLA C+D,50"
IC342 20cm Tot Int+B-Vectors VLA - C	IC342 20cm Pol Int VLA - C
IC342 11.1cm Tot Int+B-Vectors Effelsberg	IC342 11.1cm Pol Int Effelsberg
IC342 6.2cm Tot Int+B-Vectors Effelsberg	IC342 6.2cm Pol Int Effelsberg
IC342-NW 6.2cm Tot Int+B-Vectors VLA Beam=15"	IC342-NW 6.2cm Pol Int VLA Beam=15"
IC342-NW 6.2cm Tot Int+B-Vectors VLA Beam=20"	IC342-NW 6.2cm Pol Int VLA Beam=20"
IC342-Center 3cm Tot Int+B-Vectors VLA	IC342-Center 3cm Pol Int VLA
IC342 2.8cm Tot Int+B-Vectors Effelsberg Beam=75"	IC342 2.8cm Pol Int Effelsberg Beam=75"
IC342 2.8cm Tot Int+B-Vectors Effelsberg Beam=90"	IC342 2.8cm Pol Int Effelsberg Beam=90"
NGC253 20cm Tot Int+Mag Field VLA	NGC253 2.8cm Tot Int+Mag Field Effelsberg
NGC891 2.8cm Tot Int+B-Vectors Effelsberg	NGC891 2.8cm Pol Int Effelsberg	Polarized radio emission at 2.8cm from a selected sample of edge-on galaxies. Radio and Polarization Properties in the Disk and Halo of Edge-On Spirals
NGC1097 6cm Tot Int +B-Vectors VLA Beam=10"	NGC1097 6cm Pol Int VLA Beam=10"
NGC1097 3cm Tot Int +B-Vectors VLA Beam=10"	NGC1097 3cm Pol Int VLA Beam=10"
NGC1097 6cm Tot Int +B-Vectors VLA Beam=15"	NGC1097 6cm Pol Int VLA Beam=15"
NGC1097 3cm Tot Int +B-Vectors VLA Beam=15"	NGC1097 3cm Pol Int VLA Beam=15"
NGC1097 center 6cm Tot Int +B-Vectors VLA Beam=4"	NGC1097 center 6cm Pol Int VLA Beam=4"
NGC1097 center 3cm Tot Int +B-Vectors VLA Beam=4"	NGC1097 center 3cm Pol Int VLA Beam=4"
NGC1097 center 3cm Tot Int +B-Vectors VLA Beam=3"	NGC1097 center 3cm Pol Int VLA Beam=3"
NGC1097 center 3cm Tot Int +B-Vectors VLA Beam=2"
NGC1365 3.5cm Tot Int +mag Field VLA	NGC1365 3.5cm pol Int VLA
NGC1365 6.2cm Tot Int +mag Field VLA	NGC1365 6.2cm Pol Int VLA
NGC1566 6cm ATCA Tot Int +mag Field	NGC1566 6cm ATCA Pol Int
NGC2276 6cm Tot Int +mag Field VLA	NGC2276 6.2cm Po l Int VLA
NGC2997 3.5cm Tot Int +mag Fie ld VLA	NGC2997 3.5cm Pol Int VLA
NGC2997 center 3.5cm Tot Int +mag F ield VLA	NGC2997 center 3.5cm Pol Int VLA
NGC2997 6cm Tot Int +mag Field VLA	NGC2997 6cm Pol Int VLA
NGC2997 13cm Tot int +B-Vectors ATCA	NGC2997 13cm ATCA Pol Int
NGC3521 2.8cm Tot Int +mag Field Effelsberg	NGC3521 2.8cm Pol Int Effelsberg
NGC3627 3.5cm Tot Int +B-Vectors VLA +Effelsberg	NGC3627 3.5cm pol Int VLA +Effelsberg	Shocked magnetic fields in the perturbed galaxies NGC3627 and NGC4254
NGC3628 20cm Tot Int +B-Vectors VLA (C+D)		Radio and Polarization Properties in the Disk and Halo of Edge-On Spirals
NGC3628 2.8cm Tot Int +B-Vectors Effelsberg	NGC3628 2.8cm pol Int Effelsberg	Polarized radio emission at 2.8cm from a selected sample of edge-on galaxies.
NGC4038/9 6.2cm Tot Int +B-Vectors VLA	NGC4038/9 6.2cm Pol Int VLA
NGC4038/9 3.5cm Tot Int +B-Vectors VLA	NGC4038/9 3.5cm Pol Int VLA
NGC4254 3.5cm Tot Int +B-Vectors VLA + Effelsberg	NGC4254 3.5cm pol Int VLA + Effelsberg	Shocked magnetic fields in the perturbed galaxies NGC3627 and NGC4254
NGC4254 2.8cm Tot Int +B-Vectors Effelsberg	NGC4254 2.8cm pol Int Effelsberg
NGC4258 20cm Tot Int + B-Vectors VLA	NGC4258 20cm pol Int VLA	Peculiar CO distribution in active spiral galaxies: NCG 4258 and Circinus
NGC4414 3.5cm Tot Int +B-Vectors VLA	NGC4414 3.5cm pol Int VLA
NGC4449 6.2cm Tot Int +B-Vectors VLA + Effelsberg	NGC4449 6.2cm pol Int VLA + Effelesberg	Regular magnetic fields in the dwarf irregular galaxy NGC4449
NGC4449 3.5cm Tot Int +B-Vectors VLA + Effelsberg	NGC4449 3.5cm pol Int VLA + Effelsberg
NGC4565 2.8cm Tot Int +B-Vectors Effelsberg		Polarized radio emission at 2.8cm from a selected sample of edge-on galaxies. Radio and Polarization Properties in the Disk and Halo of Edge-On Spirals
NGC4631 22cm Tot Int +mag Field VLA	NGC4631 22cm pol Int VLA
NGC4631 6cm Tot Int +B-Vectors Effelsberg	NGC4631 6cm pol Int Effelesberg
NGC4631 6cm Tot Int +B-Vectors Effelesberg+VLA	NGC4631 6cm pol Int Effelesberg+VLA	Polar ized radio emission at 2.8cm from a selected sample of edge-on galaxie s.
NGC4631 2.8cm Tot Int +B-Vectors Effelsberg	NGC4631 2.8cm pol Int Effelsberg	NGC4631 VLA Rotation Measure:18-22cm
NGC5055 2.8cm Tot Int +B-Vectors Effelsberg	NGC5055 2.8cm pol Int Effelsberg
NGC5907 20cm Tot Int + B-Vectors VLA	NGC5907 20cm Pol Int VLA
NGC5907 6cm Tot Int +mag Field Effelsberg	NGC5907 6cm Pol Int Effelsberg
NGC5907 2.8cm Tot Int Effelsberg		The interstellar medium in the edge-on galaxy NGC5907. Cold dust and molecular line emission. The interstellar medium in the edge-on galaxy NGC5907. Radio continuum emission and mag fields Polarized radio emission at 2.8cm from a selected sample of edge-on galaxies.
NGC6822 6.2cm Tot Int +B-Vectors Effelsberg	NGC6822 6.2cm Pol Int Effelsberg
NGC6946 20cm Tot Int +B-Vectors VLA	NGC6946 20cm Pol Int VLA
NGC6946 18cm Tot Int +B-Vectors VLA	NGC6946 18cm Pol Int VLA
NGC6946 18cm Tot Int +B-Vectors VLA	NGC6946 18cm Pol Int VLA
NGC6946 6cm Tot Int +B-Vectors Effelsberg + VLA	NGC6946 6cm Pol Int Effelsberg + VLA
NGC6946 6cm Tot Int +B-Vectors VLA	NGC6946 6cm Pol Int VLA	interactions?
NGC6946 3cm Tot Int +B-Vectors Effelsberg + VLA	NGC6946 3cm Pol In t Effelsberg + VLA
NGC6946 3cm Tot Int +B-Vectors Effelsberg + VLA	NGC6946 3cm Pol Int Effelsberg + VLA
NGC6946 VLA RM 18/20cm	NGC6946 VLA RM 6/20cm	NGC6946 VLA+Effelsberg RM 3/6cm
NGC7331 2.8cm Tot Int +B-Vectors Effelsberg	NGC7331 2.8cm pol Int Effelsberg	Polarized radio emission at 2.8cm from a selected sample of edge-on galaxies.
NGC7479 3cm Tot Int +B-Vectors VLA	NGC7479 3cm pol Int VLA