HST images of IRAS F11506-3851. The left panel shows the HST-NICMOS (Near-Infrared Camera and Multi-Object Spectrometer) F160W image (Alonso-Herrero et al. 2006), whereas the right panel displays the HST-ACS (Advanced Camera for Surveys) F814W image (Robishaw et al. 2008). Overlaid are the SINFONI (9× 9, left panel) and VIMOS (27× 27, right panel) FoVs (the latter shown with dashed lines). We note that the FoV covered by the NaD absorption (20× 17) cover only the central region of the VIMOS FoV. See text for details. The white bar shows a linear scale of 1 kpc (corresponding to 453 at the adopted distance, Table 1).