The XMM¿Newton/2dF survey ¿ VIII. The extended X-ray sources

We present a sample of eight extended X-ray sources detected in the widefield (� 2.3deg 2 ), bright (2-10 ksec) XMM-Newton/2dF survey, reaching a flux limit of � 2 × 10 14 erg s 1 cm 2 . Of these, seven are identified as secure X-ray clusters in the soft 0.3-2 keV band using a standard wavelet algorithm on either the PN or the MOS images. Spectroscopic or photometric redshifts are available for five clusters, spanning a range between 0.12 and 0.68. The X-ray spectral fittings show temperatures between 1 and 4.6 keV, characteristic of poor clusters and groups of galaxies. We derive for the first time the XMM-Newton cluster number count log N log S distribution albeit with poor statistics. Both the log N log S and the Luminosity-Temperature relation are in good agreement with previous ROSAT results.