T. Gaga, M. Plionis, S. Basilakos, I. Georgantopoulos, A. Georgakakis
Monthly Notices of the Royal Astronomical Society, Volume 363, Issue 3, November 2005, Pages 811–817
Publication year: 2005


We present a sample of eight extended X-ray sources detected in the wide-field (∼2.3 deg2), bright (2–10 ks) 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.