$q$-Analogue of the degree zero part of a rational Cherednik algebra

Inside the double affine Hecke algebra of type $G{L}_n$, which depends on two parameters $q$ and $\tau$, we define a subalgebra ${\mathbb{H}}^{{\mathfrak{g}\mathfrak{l}}_n}$ that may be thought of as a $q$-analogue of the degree zero part of the corresponding rational Cherednik algebra. We prove that the algebra ${\mathbb{H}}^{{\mathfrak{g}\mathfrak{l}}_n}$ is a flat $\tau$-deformation of the crossed product of the group algebra of the symmetric group with the image of the Drinfeld-Jimbo quantum group $U_q({\mathfrak{g}\mathfrak{l}}_n)$ under the $q$-oscillator (Jordan-Schwinger) representation. We find all the defining relations and an explicit PBW basis for the algebra ${\mathbb{H}}^{{\mathfrak{g}\mathfrak{l}}_n}$. We describe its centre and establish a double centraliser property. As an application, we also obtain new integrable generalisations of Hamiltonians introduced by van Diejen.