ASTRONOMY AND ASTROPHYSICS The first XMM-Newton spectrum of a high redshift quasar

Your thesaurus codes are: missing; you have not inserted them ASTRONOMY AND ASTROPHYSICS The first XMM-Newton spectrum of a high redshift quasar-PKS 0537−286. Abstract. We present XMM-Newton observations of the high redshift (z = 3.104), radio-loud quasar PKS 0537−286. The EPIC CCD cameras provide the highest signal-to-noise spectrum of a high-z quasar to date. The EPIC observations show that PKS 0537−286 is extremely X-ray luminous (L X = 2 × 10 47 erg s −1), with an unusually hard X-ray spectrum (Γ = 1.27 ± 0.02). The flat power-law emission extends over the whole observed energy range (0.4 to 40 keV in the quasar rest frame); there is no evidence of intrinsic absorption, which has been claimed in PKS 0537−286 and other high z quasars. However, there is evidence for weak Compton reflection. A redshifted iron K line, observed at 1.5 keV-corresponding to ∼6.15 keV in the quasar rest frame-is detected at 95% confidence. If confirmed, this is the most distant iron K line known. The line equivalent width is small (33eV), consistent with the 'X-ray Baldwin effect' observed in other luminous quasars. The reflected continuum is also weak (R ∼ < 0.25). We find the overall spectral energy distribution of PKS 0537−286 is dominated by the X-ray emission, which, together with the flat power-law and weak reflection features, suggests that the X-radiation from PKS 0537−286 is dominated by inverse Compton emission associated with a face-on relativistic jet.