Image Details
Caption: Figure 2.
Distribution of recessional velocities for the Arp systems in this survey (blue), compared to the UGC catalog (magenta), each normalized by the total number. The galaxies in this atlas are biased toward lower redshifts, since they were chosen to be well matched to the wide ACS/WFC FOV.
© 2026. The Author(s). Published by the American Astronomical Society.