Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-27
Astronomy and Astrophysics
Astrophysics
4 pages, 6 ps figures, to appear in the proceedings of the "The Restless High Energy Universe" Workshop, Amsterdam, May 5-8, 2
Scientific paper
10.1016/j.nuclphysbps.2004.04.00
We present a statistical analysis of the Chandra observation of the source field around the 3C 295 galaxy cluster ($z=0.46$). The logN-logS of this field is in good agreement with that computed for the Chandra Deep Field South in this work and in previous ones. Nevertheless, the logN-logS computed separately for the four ACIS-I chips reveals that there is a significant excess of sources to the North-North East and a void to the South of the central cluster. Such an asymmetric distribution is confirmed by the two-dimensional Kolmogorov-Smirnov test, which excludes ($P \sim 3%$) a uniform distribution. In addition, a strong spatial correlation emerges from the study of the angular correlation function of the field: the angular correlation function is above that expected for X-ray sources on a few arcmin scales. In synthesis, the present analysis may indicate a filament of the large scale structure of the Universe toward 3C 295. This kind of studies may open-up a new way to map (with high efficiency) high-density peaks of large scale structures at high-z.
Cappi Massimo
D'Elia Valerio
Elvis Martin
Falco Emilio E.
Fiore Fabrizio
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