Search for radio polarization in the particle-accelerating colliding-wind binaries WR 147 and HD 167971

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Table 2

Upper limit on the fractional polarization and the quantities used to derive it.

Source	σ_Q	σ_U	σ	I_peak	$Π_{UL}^{%}$ $Mathematical equation: ${\rm{\Pi }}_{{\rm{UL}}}^\% $$
WR 147 – L band	26.6	26.3	26.6	22.3	0.36
WR 147 – C band	9.7	6.5	9.7	24.7	0.12
WR 147 – C band (7–8 GHz)	26.9	15.8	26.9	24.3	0.33
WR 147 – C band (7.75–8 GHz)	85.4	111	111	24.0	1.38
HD 167971 – L band	28.3	29.8	29.8	12.4	0.72
HD 167971 – C band	10.3	11.7	11.7	9.0	0.39
HD 167971 – C band (7–8 GHz)	20.7	15.9	20.7	7.9	0.79
HD 167971 – C band (7.75–8 GHz)	38.4	21.7	38.4	7.6	1.52

Notes. Rms noise levels (σ_Q, σ_U, σ) are given in µJy beam⁻¹ and peak Stokes I in mJy beam⁻¹. $Π_{UL}^{%}$ $Mathematical equation: ${\rm{\Pi }}_{{\rm{UL}}}^\% $$ is expressed in %.

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