094218

Observations of a newly discovered hyperluminous X-ray source in the galaxy NGC4045 at a distance of 32 Mpc have revealed an absorption line at E=8.56 keVdetected with a significance of > 3.3 sigma. The origin of the absorption lineappears likely to be by highly ionized iron with a blue shift of 0.2cindicating an ultrafast outflow. However the large equivalent width of theline EW=-0.22 keV requires extreme wind parameters. An alternative explanationis that the line is due to a cyclotron resonance scattering feature produced bythe interaction of X-ray photons with the powerful magnetic field of a neutronstar. The goal of this proposal is to detect the additional wind features suchas a P-Cygni line profile with a target of opportunity observation with XMM-Newton and NuSTAR. [truncated! Please see actual data for full text]