The SRG/eROSITA All-Sky Survey. Optical identification and properties of galaxy clusters and groups in the western galactic hemisphere
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2024
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| author | Kluge, M. Comparat, J. Liu, A. Balzer, F. Bulbul, E. Chitham, J. Ider Ghirardini, V. Garrel, C. Bahar, Y. E. Artis, E. Bender, R. Clerc, N. Dwelly, T. Fabricius, M. H. Grandis, S. Hernández-Lang, D. Hill, G. J. Joshi, J. Lamer, G. Merloni, A. Nandra, K. Pacaud, F. Predehl, P. Ramos-Ceja, M. E. Reiprich, T. H. Salvato, M. Sanders, J. S. Schrabback, T. Seppi, R. Zelmer, S. Zenteno, A. Zhang, X. |
| author_facet | Kluge, M. Comparat, J. Liu, A. Balzer, F. Bulbul, E. Chitham, J. Ider Ghirardini, V. Garrel, C. Bahar, Y. E. Artis, E. Bender, R. Clerc, N. Dwelly, T. Fabricius, M. H. Grandis, S. Hernández-Lang, D. Hill, G. J. Joshi, J. Lamer, G. Merloni, A. Nandra, K. Pacaud, F. Predehl, P. Ramos-Ceja, M. E. Reiprich, T. H. Salvato, M. Sanders, J. S. Schrabback, T. Seppi, R. Zelmer, S. Zenteno, A. Zhang, X. |
| contents | The first SRG/eROSITA All-Sky Survey (eRASS1) provides the largest intracluster medium-selected galaxy cluster and group catalog covering the western galactic hemisphere. Compared to samples selected purely on X-ray extent, the sample purity can be enhanced by identifying cluster candidates using optical and near-infrared data from the DESI Legacy Imaging Surveys. Using the red-sequence-based cluster finder eROMaPPer, we measured individual photometric properties (redshift $z_λ$, richness $λ$, optical center, and BCG position) for 12,000 eRASS1 clusters over a sky area of 13,116 deg$^2$, augmented by 247 cases identified by matching the candidates with known clusters from the literature. The median redshift of the identified eRASS1 sample is $z=0.31$, with 10% of the clusters at $z>0.72$. The photometric redshifts have an accuracy of $δz/(1+z)<0.005$ for $0.05<z<0.9$. Spectroscopic cluster properties (redshift $z_{\rm spec}$ and velocity dispersion $σ$) are measured a posteriori for a subsample of 3,210 and 1,499 eRASS1 clusters, respectively, using an extensive compilation of spectroscopic redshifts of galaxies from the literature. We infer that the primary eRASS1 sample has a purity of 86% and optical completeness >95% for $z>0.05$. For these and further quality assessments of the eRASS1 identified catalog, we applied our identification method to a collection of galaxy cluster catalogs in the literature, as well as blindly on the full Legacy Surveys covering 24,069 deg$^2$. Using a combination of these cluster samples, we investigated the velocity dispersion-richness relation, finding $\log(λ)=2.401\times\log(σ)-5.074$ with an intrinsic scatter of $0.10\pm0.01$ dex. Our main result is the identified eRASS1 cluster catalog with a high purity and a well-defined X-ray selection process, enabling precise cosmological analyses presented in companion papers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_08453 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The SRG/eROSITA All-Sky Survey. Optical identification and properties of galaxy clusters and groups in the western galactic hemisphere Kluge, M. Comparat, J. Liu, A. Balzer, F. Bulbul, E. Chitham, J. Ider Ghirardini, V. Garrel, C. Bahar, Y. E. Artis, E. Bender, R. Clerc, N. Dwelly, T. Fabricius, M. H. Grandis, S. Hernández-Lang, D. Hill, G. J. Joshi, J. Lamer, G. Merloni, A. Nandra, K. Pacaud, F. Predehl, P. Ramos-Ceja, M. E. Reiprich, T. H. Salvato, M. Sanders, J. S. Schrabback, T. Seppi, R. Zelmer, S. Zenteno, A. Zhang, X. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena The first SRG/eROSITA All-Sky Survey (eRASS1) provides the largest intracluster medium-selected galaxy cluster and group catalog covering the western galactic hemisphere. Compared to samples selected purely on X-ray extent, the sample purity can be enhanced by identifying cluster candidates using optical and near-infrared data from the DESI Legacy Imaging Surveys. Using the red-sequence-based cluster finder eROMaPPer, we measured individual photometric properties (redshift $z_λ$, richness $λ$, optical center, and BCG position) for 12,000 eRASS1 clusters over a sky area of 13,116 deg$^2$, augmented by 247 cases identified by matching the candidates with known clusters from the literature. The median redshift of the identified eRASS1 sample is $z=0.31$, with 10% of the clusters at $z>0.72$. The photometric redshifts have an accuracy of $δz/(1+z)<0.005$ for $0.05<z<0.9$. Spectroscopic cluster properties (redshift $z_{\rm spec}$ and velocity dispersion $σ$) are measured a posteriori for a subsample of 3,210 and 1,499 eRASS1 clusters, respectively, using an extensive compilation of spectroscopic redshifts of galaxies from the literature. We infer that the primary eRASS1 sample has a purity of 86% and optical completeness >95% for $z>0.05$. For these and further quality assessments of the eRASS1 identified catalog, we applied our identification method to a collection of galaxy cluster catalogs in the literature, as well as blindly on the full Legacy Surveys covering 24,069 deg$^2$. Using a combination of these cluster samples, we investigated the velocity dispersion-richness relation, finding $\log(λ)=2.401\times\log(σ)-5.074$ with an intrinsic scatter of $0.10\pm0.01$ dex. Our main result is the identified eRASS1 cluster catalog with a high purity and a well-defined X-ray selection process, enabling precise cosmological analyses presented in companion papers. |
| title | The SRG/eROSITA All-Sky Survey. Optical identification and properties of galaxy clusters and groups in the western galactic hemisphere |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2402.08453 |