/ftp/cats/aliases/G//GBB2008



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J/A+A/491/379  Velocity catalog of 293 Abell 520 field galaxies (Girardi+, 2008)
The following files can be converted to FITS (extension .fit or fit.gz)
	table1.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A+A/491/379
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Beginning of ReadMe : J/A+A/491/379 Velocities of galaxies in Abell 520 (Girardi+, 2008) ================================================================================ Cluster Abell 520: a perspective based on member galaxies. A cluster forming at the crossing of three filaments? Girardi M., Barrena R., Boschin W., Ellingson E. <Astron. Astrophys., 491, 379-395 (2008)> =2008A&A...491..379G ================================================================================ ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Radial velocities Keywords: galaxies: clusters: individual: Abell 520 - galaxies: clusters: general - galaxies: distances and redshifts Abstract: The connection of cluster mergers with the presence of extended, diffuse radio sources in galaxy clusters is still debated. An interesting case is the rich, merging cluster Abell 520, containing a radio halo. A recent gravitational analysis has shown in this cluster the presence of a massive dark core suggested to be a possible problem for the current cold dark matter paradigm. We aim to obtain new insights into the internal dynamics of Abell 520 analyzing velocities and positions of member galaxies. Our analysis is based on redshift data for 293 galaxies in the cluster field obtained combining new redshift data for 8 galaxies acquired at the TNG with data obtained by CNOC team and other few data from the literature. We also use new photometric data obtained at the INT telescope. We combine galaxy velocities and positions to select 167 cluster members around z 0.201. We analyze the cluster structure using the weighted gap analysis, the KMM method, the Dressler-Shectman statistics and the analysis of the velocity dispersion profiles. We compare our results with those from X-ray, radio and gravitational lensing analyses. Description: Multi-object spectroscopic observations of A520 were carried out at the TNG telescope in December 2006. We used DOLORES/MOS with the LR-B Grism 1. As far as photometry is concerned, our observations were carried out with the Wide Field Camera (WFC), mounted at the prime focus of the 2.5m INT telescope (located at Roque de los Muchachos observatory, La Palma, Spain). We observed A520 in January 2008.