A Deep Look at An Unobscured comma Extreme comma Super-Eddington NLS1

RX J0439.65311 is a bright NLS1 galaxy with very low attenuating column densityand very narrow Hb FWHM, small black hole mass and superEddington massaccretion rate. It has intriguing soft Xray spectral shape similar to that inthe QPO AGN REJ1034+396. It also exhibits strong Xray variability in short andlong timescales. These characteristics make RX J0439.65311 a great source forstudying the intrinsic emission from the core region of such extreme NLS1s. Wepropose a long, uninterrupted XMMNewton observation of this source (1revolution, 120130 ks), in order to conduct a detailed study of its intrinsicvariability and spectral properties in the Xray, UV and optical, and provideconstraints to its black hole mass and spin. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]