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We present our analysis of the narrow emission lines produced in the plasmaregions within the bright active galactic nucleus of NGC 4151, from an ORBYTSresearch-with-schools public engagement project. Our goal was to test whetherthe properties of these plasma regions changed between XMM- Newton observationsspanning 15 years from 2000 to 2015, by measuring the outflow velocities anddistances. From this study, we found that NGC 4151 has at least two to threeplasma regions. There is no evidence of the outflowing wind properties changingas the velocities and distances are consistent throughout the observations.

A Study of the Soft X-ray Emission Lines in NGC 4151 I. Kinematic Properties of the Plasma Wind