  In this work, we systematically study the electromagnetic properties
including the M1 radiative decay widths and the magnetic moments of the
isoscalar $\Xi_{c c} D^{(*)}$, $\Xi_{cc}D_{1}$, and $\Xi_{cc}D_{2}^{*}$
triple-charm molecular-type pentaquark candidates, where we adopt the
constituent quark model and consider both the $S$-$D$ wave mixing effect and
the coupled channel effect. Our numerical results suggest that the M1 radiative
decay widths and the magnetic moments of the isoscalar $\Xi_{c c} D^{(*)}$,
$\Xi_{cc}D_{1}$, and $\Xi_{cc}D_{2}^{*}$ triple-charm molecular-type pentaquark
candidates can reflect their inner structures, and the study of the
electromagnetic properties is the important step to construct the family of the
triple-charm molecular-type pentaquarks. With the accumulation of the
experimental data during the high-luminosity phase of LHC, we expect that the
present work combined with the corresponding mass spectrum information can
encourage the experimental colleagues at LHCb to focus on the isoscalar $\Xi_{c
c} D^{(*)}$, $\Xi_{cc}D_{1}$, and $\Xi_{cc}D_{2}^{*}$ triple-charm
molecular-type pentaquark candidates.
