2001A&A...365L.116R -
Astronomy and Astrophysics, volume 365, L116-121 (2001/1-1)
The first XMM-Newton spectrum of a high redshift quasar - PKS 0537-286.
REEVES J.N., TURNER M.J.L., BENNIE P.J., POUNDS K.A., SHORT A., O'BRIEN P.T., BOLLER T., KUSTER M. and TIENGO A.
Abstract (from CDS):
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 (LX=2x1047erg/s), 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 40keV 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 1.5keV - corresponding to ∼6.15keV 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.
Abstract Copyright:
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Journal keyword(s):
galaxies: active - quasars: individual: PKS 0537-286 - X-rays: galaxies
Simbad objects:
3
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