Stellar streams around the galaxy M63 indicate remnants of a satellite galaxy that M63 has swallowed. The central part is an ordinary positive image; in the outer regions, the negative of the image is shown. In this way, the faint structures that are the target of this survey are more readily discerned. This galaxy's distance from Earth is around 30 million light-years. The new survey has, for the first time, shown the presence of such telltale traces of spiral galaxies swallowing smaller satellites for galaxies more distant than our own Local Group of galaxies.
D. Martinez-Delgado (MPIA)