Contours of the nuclear region of NGC 4151

Contours of mid-infrared emission overlaid on other published observations of the nuclear region of NGC 4151. Images (a) and (b) show the extended N and IHW18 emission, respectively, overlaid on a HST [O III] image which traces ionized gas in the region. Images (c) and (d ) show the same N and IHW18 emission overlaid on the radio jet, as observed at 18 cm. In all images, the peak emission in the radio and [O III] are aligned to correspond with the peak in the mid-IR.