We present the final data from the spectroscopic survey of the ROSAT-ESO Flux-Limited X-ray (REFLEX) catalog of galaxy clusters. The REFLEX survey covers 4.24 steradians (34% of the entire sky) below a declination of δ = +2.50 and at high Galactic latitude (|b| > 20°). The REFLEX catalog includes 447 entries with a median redshift of 0.08 and is better than 90% complete to a limiting flux fX = 3 à 10-12 erg s-1 cm-2 (0.1 to 2.4 keV), representing the largest statistically homogeneous sample of clusters drawn from the ROSAT All-Sky Survey (RASS) to date. Here we describe the details of the spectroscopic observations carried out at the ESO 1.5 m, 2.2 m, and 3.6 m telescopes, as well as the data reduction and redshift measurement techniques. The spectra typically cover the wavelength range 3600-7500 à at a two-pixel resolution of â¼14 à , and the measured redshifts have a total rms error of â¼100 km s -1. In total we present 1406 new galaxy redshifts in 192 clusters, most of which previously did not have any redshift measured. Finally, the luminosity/redshift distributions of the cluster sample and a comparison to the no-evolution expectations from the cluster X-ray luminosity function are presented.
The REFLEX galaxy cluster survey: VIII. Spectroscopic observations and optical atlas / L. Guzzo, P. Schuecker, H. Böhringer, C.A. Collins, A. Ortiz-Gil, S. De Grandi, A.C. Edge, D.M. Neumann, S. Schindler, C. Altucci, P.A. Shaver. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 499:2(2009), pp. 357-369.
The REFLEX galaxy cluster survey: VIII. Spectroscopic observations and optical atlas
L. Guzzo;
2009
Abstract
We present the final data from the spectroscopic survey of the ROSAT-ESO Flux-Limited X-ray (REFLEX) catalog of galaxy clusters. The REFLEX survey covers 4.24 steradians (34% of the entire sky) below a declination of δ = +2.50 and at high Galactic latitude (|b| > 20°). The REFLEX catalog includes 447 entries with a median redshift of 0.08 and is better than 90% complete to a limiting flux fX = 3 à 10-12 erg s-1 cm-2 (0.1 to 2.4 keV), representing the largest statistically homogeneous sample of clusters drawn from the ROSAT All-Sky Survey (RASS) to date. Here we describe the details of the spectroscopic observations carried out at the ESO 1.5 m, 2.2 m, and 3.6 m telescopes, as well as the data reduction and redshift measurement techniques. The spectra typically cover the wavelength range 3600-7500 à at a two-pixel resolution of â¼14 à , and the measured redshifts have a total rms error of â¼100 km s -1. In total we present 1406 new galaxy redshifts in 192 clusters, most of which previously did not have any redshift measured. Finally, the luminosity/redshift distributions of the cluster sample and a comparison to the no-evolution expectations from the cluster X-ray luminosity function are presented.File | Dimensione | Formato | |
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