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J. T. Radomski, R. K. Pina, C. Packham, C. M. Telesco (University of Florida), R. S. Fisher (Gemini Observatory), J. M. De Buizer (Cerro Tololo Inter-American Observatory)
We present subarcsecond resolution mid-infrared images of the Seyfert 1 galaxy NGC 4151 at 18 um. These images were obtained with the University of Florida mid-IR camera/spectrometer OSCIR at the Gemini North 8-m telescope. Our data show extended mid-infrared emission along the direction of the ionization cone coincident with extended [OIII] emission observed with the HST (e.g. Kaiser et al. 2000, ApJ, 528, 260). This result is similar to extended mid-infrared emission detected coincident with [OIII] emission in the ionization cone of the active galaxy Cygnus A (Radomski et al. 2001 - astro-ph/0110347).