Near-infrared spectrophotometry of NGC 4151 shows lines of B-gamma and forbidden-line Fe II. Accurate differential photometry at 10 microns indicates no variation greater than 8%, with changes in near-infrared and nonthermal flux of a factor of two or more. These observations are combined with previously published ones to construct a comprehensive model for the continuum of the nucleus of this galaxy. For wavelengths longer than 1 micron, the continuum is dominated by thermal reradiation by dust. Reddening by this dust strongly influences the observed properties of the nonthermal continuum and the relative emission-line strengths.
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Rieke et al. (1981) studied this question.