Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-06
Mon.Not.Roy.Astron.Soc. 351 (2004) 989
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figures, MNRAS accepted
Scientific paper
10.1111/j.1365-2966.2004.07841.x
We directly compare X-ray and optical techniques of cluster detection by combining SDSS photometric data with a wide-field ($\sim 1.8$ deg$^{2}$) XMM-{\em Newton} survey in the North Galactic Pole region. The optical cluster detection procedure is based on merging two independent selection methods - a smoothing+percolation technique, and a Matched Filter Algorithm. The X-ray cluster detection is based on a wavelet-based algorithm, incorporated in the SAS v.5.2 package. The final optical sample counts 9 candidate clusters with richness of more than 20 galaxies, corresponding roughly to APM richness class. Three, of our optically detected clusters are also detected in our X-ray survey. The most probable cause of the small number of optical cluster candidates detected in our X-ray survey is that they are relatively poor clusters, fainter than the X-ray flux limit (for extended sources) of our survey $f_{x}(0.3-2 {\rm keV}) \simeq 2 \times 10^{-14} erg cm^{-2} s^{-1}$.
Basilakos Spyros
Gaga T.
Georgakakis Antonis
Georgantopoulos Ioannis
Kolokotronis Vaggelis
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