tokens: and disregarded signals below this cutoff as manifestations of polarization bias (see e.g. George, Stil Keller 2012 ). The FD and p values of our target sources were obtained by fitting a second-order polynomial to the highest peak in of each source (e.g. Heald et al. 2009 ; Mao et al. 2010 ; Betti et al. 2019 ). Specifically, we fitted to the seven data points nearest to the highest peak, with the FD uncertainty calculated by (e.g. Mao et al. 2010 ; Iacobelli, Haverkorn Katgert 2013 ). We did not correct for the Ricean polarization bias since we do not expect it to have significant effects for our case with S/N > 6 (Wardle Kronberg 1974 ; George et al. 2012 ). All these results from our new VLA observations (FD new and p new ), along with their counterparts in the original NVSS catalogue ( p NVSS ), the Taylor et al. ( 2009 ) catalogue (FD TSS09 and p TSS09 ), and Van Eck et al. ( 2011 ) observations (FD VE11 ) are listed in Tables 1 and 2 for on- and off-axis targets, respectively. We found that three on-axis and seven off-axis sources are unpolarized in our new observations (i.e. p new below our 6σ cut-off). The 1σ values in p new of these sources are reported within parentheses in the two tables. In total, we derived the FD values of 194 polarized EGSs, with 168 and 26 on- and off-axis targets, respectively. The sky distribution of our EGS FD is plotted in Fig. 1 (top panel). Figure 1. EGS FD values from (top) our new VLA observations and (bottom) Van Eck et al. ( 2011 ) observations, both plotted as colour dots. The background grey-scale map represents the WHAMSS Hα map (Haffner et al. 2003 , 2010 ). The typical uncertainty of our new FD is about , while that of the Van Eck et al. ( 2011 ) is about . The orange circle in the top panel outlines a prominent H ii structure, G26.5, and EGSs within this circle were not considered in our analysis (see Section 5.2 ). Table 1. RM-Synthesis results for on-axis targets. Notes: FD new and p new from this work; FD VE11 from Van Eck et al. ( 2011 ); FD TSS09 and p TSS09 from Taylor et al. ( 2009 ); and p NVSS from Condon et al. ( 1998 ). ⊙ Situated behind the prominent H ii structure G26.5. † Suffers from n π-ambiguity in Taylor et al. ( 2009 ). Table 2. RM-Synthesis results for off-axis targets. Notes: None of these sources are listed in Taylor et al. ( 2009 ) or Van Eck et al. ( 2011 ). FD new and p new from this work; and p NVSS from Condon et al. ( 1998 ). ⊙ Situated behind the prominent H ii structure G26.5. In order to assess the residual leakage signal level present in our data, we formed Faraday spectra of our unpolarized on-axis leakage calibrator (J1407+2827) using data from each of the seven observing blocks. We find that the highest peak out of the seven Faraday spectra is at a value of p = 0.024 ± 0.007 per cent, much lower than that of all of our polarized target sources. Note that the weak polarization signal we see from J1407+2827 here is likely due to polarization bias stemming
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