In this paper we continue the study of the spaces $\mathcal{ O}_{ M,\omega}(\mathbb{ R}^N)$ and $\mathcal{ O}_{ C,\omega}(\mathbb{ R}^N)$ undertaken in [1]. We determine new representations of such spaces and we give some structure theorems for their dual spaces. Furthermore, we show that $\mathcal{ O}'_{ C,\omega}(\mathbb{ R}^N)$ is the space of convolutors of the space $\mathcal{ S}_\omega(\mathbb{ R}^N)$ of the $\omega$-ultradifferentiable rapidly decreasing functions of Beurling type (in the sense of Braun, Meise and Taylor) and of its dual space $\mathcal{ S}'_\omega(\mathbb{ R}^N)$. We also establish that the Fourier transform is an isomorphism from $\mathcal{ O}'_{ C,\omega}(\mathbb{ R}^N)$ onto $\mathcal{ O}_{ M,\omega}(\mathbb{ R}^N)$. In particular, we prove that this isomorphism is topological when the former space is endowed with the strong operator lc-topology induced by $\mathcal{ L}_b(\mathcal{ S}_\omega(\mathbb{ R}^N))$ and the last space is endowed with its natural lc-topology.
Categories: math.FA