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The multiwavelength emission spectrum and associated velocity field of theSeyfert prototype NGC 4151 is modeled. HST data has impressively revealed theexistence of a large range of velocities (100 - 1500 \kms) dominating theemitting clouds in the extended emission line region of the galaxy. Followingthis observational result, a revision of the photoionization modeling approachapplied to NGC 4151 is presented. It is concluded that a mixture of radiationdominated clouds and shock dominated clouds are required to explain themultiwavelength line and continuum spectra of the galaxy.Comment: 16 pages, LaTeX class for Astronomy and Astrophysics (including 3  Tables) + 8 PostScript figures. To appear in "Astronomy and Astrophysics

The signature of high-velocity gas in the spectra of NGC 4151