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This paper presents the results of searches for anisotropy in arrivaldirections of ultra-high energy cosmic rays detected with the Yakutsk Arrayduring the 1974--2008 observational period together with available data fromother giant extensive air shower arrays working at present. A method ofanalysis based on a comparison of the minimal width of distributions inequatorial coordinates is applied. As a result, a hypothesis of isotropy inarrival directions is rejected at the $99.5\%$ significance level. The observeddecrease in the minimal width of distribution can be explained by the presenceof cosmic ray sources in energy intervals and sky regions according to therecent indications inferred from data of the Yakutsk Array and Telescope Arrayexperiments.

A minimal width of the arrival direction distribution of ultra-high energy cosmic rays detected with the Yakutsk array