Unifying X-ray Weak Quasars: Is there a Highly Absorbed Component in PHL 1811questionMark

Quasars exhibit Xray emission proportional to their UV emission, and most Xrayweak objects are absorbed. The exception may be PHL 1811, a nearby quasar thatis 25100 times Xray fainter than expected, but has a steep and variable Xrayspectrum suggesting a direct view of the central engine. It also has unusual UVemission line properties that are consistent with its Xray weak SED. Searchesfor PHL 1811 analogs, chosen by their UV spectral properties, find objects thatare Xray weak but which have hard Xray spectra, suggesting absorption.Previous Xray observations of PHL 1811 extended only to 6 keV, so a highlyabsorbed component can.t be ruled out. We propose coordinated XMM Newton andNuSTAR observations to see whether PHL 1811 is intrinsically normal and highly absorbed. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]