A Drinfeld type presentation of affine $\imath$quantum groups II: split BCFG type

Abstract: Recently, Lu and Wang formulated a Drinfeld type presentation for $\imath$quantum group $\widetilde{{\mathbf U}}^\imath$ arising from quantum symmetric pairs of split affine ADE type. In this paper, we generalize their results by establishing a current presentation for $\widetilde{{\mathbf U}}^\imath$ of arbitrary split affine type.