  This paper considers ground states of two-component Bose gases confined in an
anharmonic trap rotating at the velocity $0<\Omega<\infty$, where the
intraspecies interaction $(-a_1,-a_2)$ and the interspecies interaction
$-\beta$ are both attractive, i.e, $a_1, a_2$ and $\beta$ are all positive. We
prove the axially symmetry and the refined spike profiles of ground states as
$\beta\nearrow\beta^*:=a^*+\sqrt{(a^*-a_1)(a^*-a_2)}$, where $0<a_1,\,
a_2<a^*:=\|Q\|^2_2$ are fixed and $Q>0$ is the unique positive solution of
$-\Delta u+u-u^3=0$ in $\mathbb{R}^2$.
