1. Cosmology with XMM galaxy clusters: the X-CLASS/GROND catalogue and photometric redshifts.
- Author
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Ridl, J., Clerc, N., Sadibekova, T., Faccioli, L., Pacaud, F., Greiner, J., Krühler, T., Rau, A., Salvato, M., Menzel, M. -L., Steinle, H., Wiseman, P., Nandra, K., and Sanders, J.
- Subjects
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X-ray detection , *PHOTOMETRIC stereo , *REDSHIFT , *GAMMA rays , *GALAXY clusters - Abstract
The XMM Cluster Archive Super Survey (X-CLASS) is a serendipitously detected X-ray-selected sample of 845 galaxy clusters based on 2774XMMarchival observations and covering an approximately 90 deg2 spread across the high-Galactic latitude (|b| > 20°) sky. The primary goal of this survey is to produce a well-selected sample of galaxy clusters on which cosmological analyses can be performed. This paper presents the photometric redshift followup of a high signal-to-noise ratio subset of 265 of these clusters with declination δ < +20° with Gamma-Ray Burst Optical and Near-Infrared Detector (GROND), a 7-channel (grizJHK) simultaneous imager on the MPG 2.2-m telescope at the ESO La Silla Observatory. We use a newly developed technique based on the red sequence colour-redshift relation, enhanced with information coming from the X-ray detection to provide photometric redshifts for this sample. We determine photometric redshifts for 232 clusters, finding a median redshift of z = 0.39 with an accuracy of Δz = 0.02(1 + z) when compared to a sample of 76 spectroscopically confirmed clusters.We also computeX-ray luminosities for the entire sample and find amedian bolometric luminosity of 7.2 × 1043 erg s-1 and a median temperature of 2.9 keV. We compare our results to those of the XMM-XCS and XMM-XXL surveys, finding good agreement in both samples. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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