Left: early-type galaxy ESO 420-G13 imaged by Spitzer/IRAC in the 3.6 μm continuum. Right: ALMA resolves the cold dust continuum at 1.2 mm into several knots that define a spiral pattern (background map). The nuclear disc is also revealed in the VLT/VISIR warm dust continuum at 12.7 μm adjacent to the [Ne II]_12.8μm emission line (black contours, starting from 2× RMS with a spacing of ×10^N/3; Asmus et al. 2014). The nuclear point-like source is possibly associated with synchrotron emission from the AGN, also detected at radio frequencies (Condon et al. 1996, 1998). The synthesised beam size is shown in the upper right corner.