g-band image of Malin 1. Labels A and B, respectively, mark the position of Malin 1B, the nearby companion galaxy of Malin 1 identified by Reshetnikov et al. (2010) and of a likely background galaxy (Galaz et al. 2015). A few regions selected for additional analysis (see Sect. 4.1) are also shown (green delimited regions were selected in the g-band images, blue delimited regions were chosen in addition from the UV images, after the reduction described in Sect. 2.1). All the original images at their native resolution are shown in Appendix A.