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We present the final results from the XMM-Newton validation follow-up of newPlanck galaxy cluster candidates. We observed 15 new candidates, detected withsignal-to-noise ratios between 4.0 and 6.1 in the 15.5-month nominal Plancksurvey. The candidates were selected using ancillary data flags derived fromthe ROSAT All Sky Survey (RASS) and Digitized Sky Survey all-sky maps, with theaim of pushing into the low SZ flux, high-z regime and testing RASS flags asindicators of candidate reliability. 14 new clusters were detected by XMM,including 2 double systems. Redshifts lie in the range 0.2 to 0.9, with 6clusters at z>0.5. Estimated M500 range from 2.5 10^14 to 8 10^14 Msun. Wediscuss our results in the context of the full XMM validation programme, inwhich 51 new clusters have been detected. This includes 4 double and 2 triplesystems, some of which are chance projections on the sky of clusters atdifferent z. We find that association with a RASS-BSC source is a robustindicator of the reliability of a candidate, whereas association with a FSCsource does not guarantee that the SZ candidate is a bona fide cluster.Nevertheless, most Planck clusters appear in RASS maps, with a significancegreater than 2 sigma being a good indication that the candidate is a realcluster. The full sample gives a Planck sensitivity threshold of Y500 ~ 4 10^-4arcmin^2, with indication for Malmquist bias in the YX-Y500 relation below thislevel. The corresponding mass threshold depends on z. Systems with M500 > 510^14 Msun at z > 0.5 are easily detectable with Planck. The newly-detectedclusters follow the YX-Y500 relation derived from X-ray selected samples.Compared to X-ray selected clusters, the new SZ clusters have a lower X-rayluminosity on average for their mass. There is no indication of departure fromstandard self-similar evolution in the X-ray versus SZ scaling properties.(abridged)

Planck Intermediate Results. IV. The XMM-Newton validation programme for new Planck galaxy clusters