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The ROSAT Brightest Cluster Sample (BCS) - I. The compilation of the sample and the cluster log N-log S distribution | H. Ebeling
; A.C. Edge
; H. Böhringer
; S.W. Allen
; C.S. Crawford
; A.C. Fabian
; W. Voges
; J.P. Huchra
; | Date: |
21 Dec 1998 | Journal: | Ebeling et al. 1998, MNRAS, 301, 881 | Subject: | astro-ph | Abstract: | We present a 90 per cent flux-complete sample of the 201 X-ray brightest clusters of galaxies in the northern hemisphere (dec > 0 deg), at high Galactic latitudes (|b| > 20 deg), with measured redshifts z < 0.3 and fluxes higher than 4.4 x 10^(-12) erg cm^(-2) s^{-1) in the 0.1-2.4 keV band. The sample, called the ROSAT Brightest Cluster Sample (BCS), is selected from ROSAT All-Sky Survey data and is the largest X-ray selected cluster sample compiled to date. In addition to Abell clusters, which form the bulk of the sample, the BCS also contains the X-ray brightest Zwicky clusters and other clusters selected from their X-ray properties alone. Effort has been made to ensure the highest possible completeness of the sample and the smallest possible contamination by non-cluster X-ray sources. X-ray fluxes are computed using an algorithm tailored for the detection and characterization of X-ray emission from galaxy clusters. These fluxes are accurate to better than 15 per cent (mean 1 sigma error). We find the cumulative log N-log S distribution of clusters to follow a power law k S^(-alpha) with alpha=1.31 (+0.06)(-0.03) (errors are the 10th and 90th percentiles) down to fluxes of 2 x 10^(-12) erg cm^(-2) s^(-1), i.e. considerably below the BCS flux limit. Although our best-fitting slope disagrees formally with the canonical value of -1.5 for a Euclidean distribution, the BCS log N-log S distribution is consistent with a non-evolving cluster population if cosmological effects are taken into account. | Source: | arXiv, astro-ph/9812394 | Services: | Forum | Review | PDF | Favorites |
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