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We present results of deep polarization imaging at 1.4 GHz with the DominionRadio Astrophysical Observatory as part of the DRAO Planck Deep Fields project.This deep extragalactic field covers 15.16 square degrees centered at RA = 16h14m and DEC = 54d 56', has an angular resolution of 42" x 62" at the fieldcenter, and reaches a sensitivity of 55 microJy/beam in Stokes I and 45microJy/beam in Stokes Q and U. We detect 958 radio sources in Stokes I ofwhich 136 are detected in polarization. We present the Euclidean-normalizedpolarized differential source counts down to 400 microJy. These counts indicatethat sources have a higher degree of fractional polarization at fainter StokesI flux density levels than for brighter sources, confirming an earlier result.We find that the majority of our polarized sources are steep-spectrum objectswith a mean spectral index of -0.77, and there is no correlation betweenfractional polarization and spectral index. We also matched deep field sourcesto counterparts in the Faint Images of the Radio Sky at Twenty Centimeterscatalogue. Of the polarized sources, 77% show structure at the arc-second scalewhereas only 38% of the sources with no detectable polarization show suchstructure. The median fractional polarization is for resolved sources is 6.8%,while it is 4.4% for compact objects. The polarized radio sources in our deepfield are predominantly those sources which are resolved and show the highestdegrees of fractional polarization, indicating that the lobe dominatedstructure may be the source of the highly polarized sources. These resolvedradio galaxies dominate the polarized source counts at P_0 = sqrt(Q^2 + U^2) <3 mJy.

The DRAO Planck Deep Fields: the polarization properties of radio galaxies at 1.4 GHz