Deep photometry of spiral galaxies

In this study, we consider the potential of using deep photometry for exploring the structure of spiral galaxies. As a source of deep photometry, the modern DESI Legacy Imaging Surveys is chosen, with a wide coverage of the Northern hemisphere. Several examples of spiral galaxies with various structural features of low surface brightnesses are presented which are not seen in images with an ordinary depth. In particular, we consider faint spirals beyond the optical radius, tidal structures (disk warps, stellar streams, and loops), as well as faint polar structures, which are arranged perpendicularly to the disk plane. Therefore, the use of deep photometry reveals new opportunities for studying the structural properties of galaxies and allows one to make more reliable conclusions about their evolution.