ar X iv : a st ro - p h / 99 08 34 8 v 1 3 1 A ug 1 99 9 X - ray Clusters and the Search for Cosmic Flows
نویسندگان
چکیده
We are engaged in an investigation of the relationship between the properties of BCG candidates and X-ray characteristics of their host clusters for a flux-limited (F X = 3 × 10 −12 erg s −1 cm −2) sample of ∼ 250 ACO clusters from the ROSAT all-sky survey. We aim to search for the convergence scale of bulk streaming flows within the ∼ 300 h −1 Mpc defined by this sample. X-ray selection provides significant advantages over previous optically selected samples. No R-band magnitude-structure correlation is present in this sample. Furthermore, no correlation between R-band magnitude of the BCG candidate and X-ray luminosity of the host cluster is evident. The resultant scatter of ∼ 0.34 mag. is larger than in (corrected) optically selected samples. Hence, attempts to recover Local Group peculiar velocity vectors with respect to inertial frames defined by such samples via standard candle methods may have limited sensitivity.
منابع مشابه
ar X iv : a st ro - p h / 96 08 03 6 v 1 8 A ug 1 99 6 TABLE 1 Properties of LMC Double - Mode
متن کامل
ar X iv : a st ro - p h / 98 08 21 9 v 1 2 0 A ug 1 99 8 Sgr A ∗ : A supermassive black hole or a spatially extended object ?
متن کامل
ar X iv : a st ro - p h / 99 12 18 4 v 1 9 D ec 1 99 9 The Virtues of X – ray Clusters and the Entropy of Cos - mic
The thermodynamics of the diffuse, X-ray emitting gas in clusters and groups of galaxies are affected by a certain amount of non–gravitational energy input, as indicated by the scaling properties of X–ray halos. Such a view has been recently confirmed by the detection of an excess entropy in the center of groups. It is not easy, however, to identify unambiguously the source and the epoch of suc...
متن کاملar X iv : a st ro - p h / 99 08 08 7 v 1 8 A ug 1 99 9 Sunyaev – Zel ’ dovich fluctuations from spatial correlations
We present angular power spectra of the cosmic microwave background radiation anisotropy due to fluctuations of the Sunyaev-Zel’dovich (SZ) effect through clusters of galaxies. A contribution from the correlation among clusters is especially focused on, which has been neglected in the previous analyses. Employing the evolving linear bias factor based on the Press-Schechter formalism, we find th...
متن کامل