Fig. 3

Polarization maps of CO (J = 2 → 1) spectral lines in the blue-shifted (− 30 to − 7 km s-1, left) and red-shifted (− 2 to 20 km s-1, right) wings, with quarter-beam sampling. For each spectral line, the linear polarization levels and angles are calculated across velocity ranges spanning each line wing separately and only polarization vectors with p ≥ 3σp are plotted. These maps are corrected for instrumental polarization and the intrinsic linear polarization levels vary between 0.5 − 0.8% across the maps. The beam size is shown in the lower right corners and the offsets are with respect to the reference coordinates , δ (J2000) = + 22°39′36″.
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