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We present new results from our study of the X-rayed outflow of the z = 3.91gravitationally lensed broad absorption line (BAL) quasar APM 08279+5255. Theseresults are based on spectral fits to all the long exposure observations of APM08279+5255 using a new quasar-outflow model. This model is based on cloudysimulations of a near-relativistic quasar outflow. The main conclusions fromour multi-epoch spectral re-analysis of Chandra, XMM-Newton and Suzakuobservations of APM 08279+5255 are: 1) In every observation we confirm thepresence of two strong features, one at rest-frame energies between 1-4 keV,and the other between 7-18 keV. 2) We confirm that the low-energy absorption(1-4 keV rest-frame) arises from a low-ionization absorber with logNH~23 andthe high-energy absorption (7-18 keV rest-frame) arises from highly ionized(3>log xi>4; where xi is the ionization parameter) iron in a near-relativisticoutflowing wind. Assuming this interpretation, we find that the velocities onthe outflow could get up to ~0.7c. 3) We confirm a correlation between themaximum outflow velocity and the photon index and find possible trends betweenthe maximum outflow velocity and the X-ray luminosity, and between the totalcolumn density and the photon index. We performed calculations of the forcemultipliers of material illuminated by absorbed power laws and aMathews-Ferland SED. We found that variations of the X-ray and UV parts of theSEDs and the presence of a moderate absorbing shield will produce importantchanges in the strength of the radiative driving force. These results supportthe observed trend found between the outflow velocity and X-ray photon index inAPM 08279+5255. If this result is confirmed it will imply that radiationpressure is an important mechanism in producing quasar outflows.

A study of the X-rayed outflow of APM 08279+5255 through photoionization codes