Zero-polarization candidate regions for the calibration of wide-field optical polarimeters

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Table 1

Properties of the dark patch candidates.

Name	N_stars	RA	Dec						q_std		ū	u_std	σ_ū
		(deg)	(deg)	(%)	(%)	(º)	(º)	(%)	(%)	(%)	(%)	(%)	(%)
North

DPN1	17	246.7065	44.0438	0.283	0.029	49.236	3.268	−0.042	0.179	0.039	0.282	0.134	0.029
DPN2	25	165.3404	59.5480	0.105	0.026	31.952	8.513	0.048	0.202	0.032	0.098	0.140	0.025
DPN3	16	220.4940	59.9686	0.058	0.041	82.982	22.315	−0.068	0.177	0.041	0.017	0.102	0.032
DPN4	31	160.4000	56.6931	0.049	0.023	50.342	14.019	−0.010	0.099	0.027	0.053	0.108	0.023

South

DPS1	29	59.1394	−15.6599	0.093	0.018	36.449	6.675	0.028	0.098	0.018	0.091	0.119	0.018
DPS2	37	342.303	−17.6786	0.123	0.014	−43.864	6.829	0.005	0.086	0.014	−0.126	0.134	0.014
DPS3	25	70.4262	−53.1910	0.039	0.019	26.565	18.178	0.027	0.093	0.019	0.036	0.145	0.019
DPS4	23	53.0764	−28.4748	0.047	0.020	42.145	12.009	0.005	0.110	0.020	0.050	0.115	0.020
DPS5	22	343.9268	−51.2097	0.049	0.020	−70.166	12.772	−0.041	0.098	0.020	−0.034	0.090	0.020
DPS6	26	345.6808	−51.7997	0.049	0.018	−63.652	12.131	−0.032	0.114	0.018	−0.042	0.102	0.018
DPS7	25	342.3994	−49.7344	0.024	0.020	−63.435	24.630	−0.018	0.117	0.020	−0.024	0.090	0.020
DPS8	24	340.8273	−49.0403	0.069	0.019	−65.817	9.862	−0.048	0.106	0.019	−0.054	0.119	0.019

Dark patches of Skalidis et al. (2018)

DP1	24	191.2318	57.1060	0.0	0.038	41	22	0.007		0.041	0.053		0.037
DP2	23	150.7294	54.4580	0.107	0.036	18	9	0.091		0.036	0.066		0.036
DP3	21	144.9987	34.1192	0.203	0.044	6	5	0.203		0.045	0.045		0.037

Notes. correspond to the debiased estimate of the mean polarization, and its error, respectively; are similar for the polarization angle; are the weighted mean of q values, its standard deviation, and error on the mean respectively, and a similar meaning for u. Empty cells correspond to information that is not available.

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