========================================================================== J/A+A/507/671 Star formation activities of galaxies at z=1.2 (Tanaka+, 2009) The following files can be converted to FITS (extension .fit or fit.gz) table2.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/A+A/507/671 ==========================================================================
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Beginning of ReadMe : J/A+A/507/671 Spectroscopy in cluster RDCS J1252.9-2927 (z=1.2) (Tanaka+, 2009) ================================================================================ Star formation activities of galaxies in the large-scale structures at z=1.2. Tanaka M., Lidman C., Bower R.G., Demarco R., Finoguenov A., Kodama T., Nakata F., Rosati P. <Astron. Astrophys., 507, 671-682 (2009)> =2009A&A...507..671T ================================================================================ ADC_Keywords: Clusters, galaxy ; Redshifts ; Galaxies, photometry Keywords: galaxies: evolution - galaxies: clusters: individual: RDCS J1252-29 - cosmology: large-scale structure of Universe Abstract: Recent wide-field imaging observations of the X-ray luminous cluster RDCS J1252.9-2927 at z=1.24 uncovered several galaxy groups that appear to be embedded in filamentary structure extending from the cluster core. We make a spectroscopic study of the galaxies in these groups using GMOS on Gemini-South and FORS2 on VLT with the aim of determining if these galaxies are physically associated to the cluster. We find that three groups contain galaxies at the cluster redshift and that they are probably bound to the cluster. This is the first confirmation of filamentary structure as traced by galaxy groups at z>1. We then use several spectral features in the FORS2 spectra to determine the star formation histories of group galaxies. Description: The GMOS observations were taken between January and March 2007 and were obtained with the R400 grating set to 7800AA and 7900AA to fill the detector gaps, and the G5325 order sorting filter. The FORS2 observations were taken between April and July 2008 and were obtained with the 300I grism and the OG590 order sorting filter. This setting covers the 6000-10000AA wavelength range.