An XMM-Newton observation of the bright QSO PG1211+143 was previously reported\ud to show evidence for a massive, energetic outflow, with an outflow velocity of v~0.1c\ud based on the identification of blue-shifted absorption lines detected in both EPIC and\ud RGS spectra. Subsequently, an order-of-magnitude lower velocity has been claimed\ud from an ion-by-ion model fit to the RGS data. We show here, in a re-analysis of\ud the higher signal-to-noise EPIC data, that the high velocity is confirmed, with the\ud resolution of additional absorption lines yielding a revised outflow velocity in the\ud range ~0.13-0.15c. Confirmation of a massive and energetic outflow in a non-BAL\ud AGN has important implications for metal enrichment of the IGM and for the feedback\ud mechanism implied by the correlation of black hole and galactic bulge masses.We note\ud the near-Eddington luminosity of PG1211+143 may be the critical factor in driving\ud such an energetic outflow, a situation likely to be common in AGN at higher redshift.Publisher versio
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