Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-22
Astronomy and Astrophysics
Astrophysics
4 pages, 8 ps figures, proceeding of the 6th italian workshop on AGNs
Scientific paper
We present a statistical analysis of the Chandra observation of the source field around the 3C 295 galaxy cluster (z=0.46) aimed at the search for clustering of X-ray sources. Three different methods of analysis, namely a chip by chip logN-logS, a two dimensional Kolmogorov-Smirnov test, and the angular correlation function (ACF) show a strong overdensity of sources in the North-East of the field. In particular, the ACF shows a clear signal on scales of 0.5 - 5 arcmin. This correlation angle is > 2 times higher than that of a sample of 8 ACIS-I field at the 2.5 sigma confidence level. If this overdensity is spatially associated to the cluster, we are observing a 'filament' of the large scale structure of the Universe. We discuss some first results that seem to indicate such an association.
Cocchia Filomena
D'Elia Valerio
Fiore Fabrizio
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