Identification of low-redshift groups and clusters of galaxies in the X-CLASS survey and the X-ray luminosity-temperature relation

Open Access

Fig. 1.

Performances of the photometric redshift estimates. Top: Photometric redshifts vs. spectroscopic redshifts for confirmed X-CLASS clusters. Bottom: Bias (red) and NMAD scatter (blue) of the photometric redshift estimates as a function of spectroscopic redshifts for confirmed X-CLASS clusters. From left to right: (i) bias-corrected photXclus redshift, (ii) redMaPPer redshift, and (iii) best photometric redshift estimate. The quantities σ_NMAD, bias (defined as the median of Δz = z_phot − z_spec), and the outlier fraction are defined in the main text.

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