Study of X-ray Weakness among Luminous Narrow-line Quasars

The unusual properties of Narrowline Seyfert 1 galaxies (NLS1s) are thought toresult from a higher accretion rate relative to Eddington than broadlineSeyferts. Luminous NLS1s should have the highest accretion rates of all. Withour recent study, several Xray weak objects were found, and it is suggestedthat Xray weakness may occur more frequently among more luminous regime. Toinvestigate the nature of Xray weak objects, we propose XMMNewton observationsof five opticallyluminous Xrayweak NLS1s. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]