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We present the Chandra discovery of soft diffuse X-ray emission in NGC 4151(L[0.5-2keV]~10^{39} erg s$^{-1}$), extending ~2 kpc from the active nucleusand filling in the cavity of the HI material. The best fit to the X-rayspectrum requires either a kT~0.25 keV thermal plasma or a photoionizedcomponent. In the thermal scenario, hot gas heated by the nuclear outflow wouldbe confined by the thermal pressure of the HI gas and the dynamic pressure ofinflowing neutral material in the galactic disk. In the case ofphotoionization, the nucleus must have experienced an Eddington limit outburst.For both scenarios, the AGN-host interaction in NGC 4151 must have occuredrelatively recently (some 10^4 yr ago). This very short timescale to the lastepisode of high activity phase may imply such outbursts occupy $\gtrsim$1% ofAGN lifetime.

Extended X-ray Emission in the HI Cavity of NGC 4151: Galaxy-scale AGN Feedback?