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Galaxy clusters and groups in the ALHAMBRA survey

AuthorsAscaso, Begoña CSIC ORCID; Benítez, Narciso CSIC ORCID; Fernández-Soto, Alberto CSIC ORCID CVN ; Molino, Alberto CSIC ORCID; Schoenell, William; Jiménez-Teja, Y. CSIC ORCID CVN; Martínez, Vicente J.; Márquez, Isabel CSIC ORCID; Masegosa, Josefa CSIC ORCID ; Nieves-Seoane, L.; Pović, Mirjana; Varela, Jesús CSIC; Olmo, Ascensión del CSIC ORCID; Moles, Mariano CSIC; Perea, Jaime CSIC ORCID; Alfaro, Emilio J. CSIC ORCID CVN ; Aparicio Villegas, Teresa CSIC; Castander, Francisco J. CSIC ORCID; Cepa, Jordi; Cerviño, Miguel CSIC ORCID CVN ; González Delgado, Rosa M. CSIC ORCID ; Cristóbal-Hornillos, David CSIC; Hurtado-Gil, L.; Husillos, César CSIC ORCID; Infante, Leopoldo; Prada, Francisco CSIC ORCID ; Cabrera-Caño, Jesús; Arnalte-Mur, P. CSIC ORCID; López-Sanjuan, C.; Merson, Alexander I.; Huertas-Company, M.; Díaz-García, L. A.; Cenarro, A.J.; Aguerri, J.A.L.; Broadhurst, T.; Quintana, José María CSIC
KeywordsX-rays: galaxies: clusters
Large-scale structure of universe
Cosmology: observations
Galaxies: evolution
Galaxies: clusters: general
Issue Date2015
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 452(1): 549-565 (2015)
AbstractWe present a catalogue of 348 galaxy clusters and groups with 0.2 < z < 1.2 selected in the 2.78 deg2 Advanced Large, Homogeneous Area Medium Band Redshift Astronomical (ALHAMBRA) survey. The high precision of our photometric redshifts, close to 1 per cent, and the wide spread of the seven ALHAMBRA pointings ensure that this catalogue has better mass sensitivity and is less affected by cosmic variance than comparable samples. The detection has been carried out with the Bayesian Cluster Finder, whose performance has been checked in ALHAMBRA-like light-cone mock catalogues. Great care has been taken to ensure that the observable properties of the mocks photometry accurately correspond to those of real catalogues. From our simulations, we expect to detect galaxy clusters and groups with both 70 per cent completeness and purity down to dark matter halo masses of Mh ∼ 3 × 1013 M⊙ for z < 0.85. Cluster redshifts are expected to be recovered with ∼0.6 per cent precision for z < 1. We also expect to measure cluster masses with σMh|M∗CL∼0.25-0.35dexσMh|MCL∗∼0.25-0.35dex precision down to ∼ 3 × 1013 M⊙, masses which are 50 per cent smaller than those reached by similar work. We have compared these detections with previous optical, spectroscopic and X-rays work, finding an excellent agreement with the rates reported from the simulations. We have also explored the overall properties of these detections such as the presence of a colour–magnitude relation, the evolution of the photometric blue fraction and the clustering of these sources in the different ALHAMBRA fields. Despite the small numbers, we observe tentative evidence that, for a fixed stellar mass, the environment is playing a crucial role at lower redshifts (z < 0.5).
DescriptionAscaso, Begoña et al.
Publisher version (URL)
Identifiersdoi: 10.1093/mnras/stv1317
issn: 0035-8711
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