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This paper is the third in a series in which we present deep Chandra ACIS-Simaging spectroscopy of the Seyfert 1 galaxy NGC 4151, devoted to study itscomplex circum-nuclear X-ray emission. Emission features in the soft X-rayspectrum of the bright extended emission (L[0.3-2keV]~10^40 erg/s) at r>130 pc(2") are consistent with the brighter OVII, OVIII, and NeIX lines seen in theChandra HETGS and XMM-Newton RGS spectra below 2 keV. We construct emissionline images of these features and find good morphological correlations with thenarrow line region clouds mapped in [OIII]5007A. Self-consistentphotoionization models provide good descriptions of the spectra of the largescale emission, as well as resolved structures, supporting the dominant role ofnuclear photoionization, although displacement of optical and X-ray featuresimplies a more complex medium. Collisionally ionized emission is estimated tobe <12% of the extended emission. Presence of both low and high ionizationspectral components and extended emission in the X-ray image perpendicular tothe bicone indicates leakage of nuclear ionization, likely filtered throughwarm absorbers, instead of being blocked by a continuous obscuring torus. Theratios of [OIII]/soft X-ray flux are approximately constant (~15) for the 1.5kpc radius spanned by these measurements, indicating a relatively constantionization parameter, consistent with the photoionized outflow of a wind-likedensity profile. Using spatially resolved features, we estimate that the massoutflow rate in NGC 4151 is ~2Msun/yr at 130 pc and the kinematic power of theionized outflow is 1.7x10^41 erg/s, approximately 0.3% of the bolometricluminosity of NGC 4151.

A Deep Chandra ACIS Study of NGC 4151. III. the Line Emission and Spectral Analysis of the Ionization Cone