  In a galaxy cluster, galaxies are mostly collisionless particles in recent
epoches. They resemble collisionless cold dark matter particles in some way.
Therefore, the spatial distributions of dark matter and cluster galaxies might
be expected to possess similar features in the gravitational potential of a
cluster. Here we use the galaxy distribution in cluster Cl0024+17 to probe for
the ringlike dark matter structure recently discovered by means of strong and
weak lensing observations. The galaxies are taken from the catalog of Czoske et
al., which contains 650 objects with measured redshifts, of which ~300 galaxies
have redshifts in the range 0.37<z<0.41 (and are therefore probable cluster
members). We find that, at about the 3-sigma level, the ringlike structure seen
in the dark matter measurement is not observed in the projected two-dimensional
galaxy distribution.
