Astrophys. J., 671, 1446-1455 (2007/December-3)
A multiwavelength analysis of the strong lensing cluster RCS 022434-0002.5 at z=0.778.
HICKS A.K., ELLINGSON E., HOEKSTRA H., GLADDERS M., YEE H.K.C., BAUTZ M., GILBANK D., WEBB T. and IVISON R.
Abstract (from CDS):
We present the results of two (101 ks total) Chandra observations of the z=0.778 optically selected lensing cluster RCS 022434-0002.5, along with weak lensing and dynamical analyses of this object. An X-ray spectrum extracted within R2500(362 h–170kpc) results in an integrated cluster temperature of 5.1+0.9–0.5keV. The surface brightness profile of RCS 022434-0002.5 indicates the presence of a slight excess of emission in the core. A hardness ratio image of this object reveals that this central emission is primarily produced by soft X-rays. Further investigation yields a cluster cooling time of 3.3x109 yr, which is less than half of the age of the universe at this redshift given the current ΛCDM cosmology. A weak lensing analysis is performed using HST images, and our weak lensing mass estimate is found to be in good agreement with the X-ray-determined mass of the cluster. Spectroscopic analysis reveals that RCS 022434-0002.5 has a velocity dispersion of 900±180 km/s, consistent with its X-ray temperature. The core gas mass fraction of RCS 022434-0002.5 is, however, found to be 3 times lower than expected universal values. The radial distribution of X-ray point sources within R200 of this cluster peaks at ∼0.7R200, possibly indicating that the cluster potential is influencing AGN activity at that radius. Correlations between X-ray and radio (VLA) point-source positions are also examined.
Cosmology: Observations - Galaxies: Clusters: General - X-Rays: Galaxies: Clusters
Table 3: [HEH2007] soft NN (Nos 1-26). Table 4: [HEH2007] hard NN (Nos 1-18).
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