090023

PG 0043+039 is the most X-ray weak quasar known. XMM-Newton observation in 2013 set a clear detection meaning a flux at least 3.8 times higher than in 2005. The quasar remained extremely X-ray weak with a peculiar spectral energy distribution (SED) and a unique UV spectrum. This unique source deserves further deeper observations to establish its X-ray spectrum its optical to hard-X-ray SED and its variability. We aim at probing our hypothesis that PG 0043+039 is a genuine X-ray weak quasar and to test alternative scenarios (ADAFs missing corona cyclotron-emission). We propose to observe PG0043+039 quasi-simultaneously (2 days) with XMM-Newton (20+100ks) NuSTAR (60ks) HST (2 orbits) 10m Hobby-Eberly and 10m SALT Telescope in South Africa. [truncated! Please see actual data for full text]