Accuracy of the Photometric Redshifts of Brightest Cluster Galaxies Identified in the CFHTLS-W1

Year 2024, Volume: 10 Issue: 4, 954 - 967, 31.12.2024

Sinan Aliş

https://doi.org/10.28979/jarnas.1562591

Abstract

We determine the accuracy of photometric redshifts for the brightest cluster galaxies (BCGs) identified in the W1 field of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). BCGs were identified from the galaxy cluster sample produced by the Wavelet Z Photometric (WaZP) cluster finding algorithm between $0.1 < z < 1$. Provided photometric redshifts with the CFHTLS official galaxy catalogs were compared with spectroscopic redshifts from large surveys. 101713 spectroscopic redshifts have been collected from the databases of major spectroscopic surveys. Cross-matching of 3283 BCGs with this large spectroscopic dataset yielded 1215 BCGs with high-quality spectroscopic redshift. These highly reliable spectroscopic redshifts enabled us to determine the photometric redshift accuracy of BCGs as $\sigma_{NMAD}$=0.020. The outlier fraction is obtained as 1.40\%. The dispersion obtained in this study is significantly better than typical photometric redshift accuracies provided in the CFHTLS releases when all types of galaxies are included, which suggests the use of BCGs as a control object when determining galaxy cluster redshifts.

Keywords

Photometric redshifts, brightest cluster galaxies, redshift surveys, galaxy clusters

Project Number

117F311

Thanks

The brightest cluster galaxy sample of the present study was derived within the framework of the TÜBİTAK project 117F311, supported by the ARDEB-1001 program. The author acknowledges the support and collaboration of the Extragalactic Astronomy Research Group members at Istanbul University.

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