Galaxy Clusters and Cosmology

Our main research areas include:

1. The study of galaxy clusters (mass estimates, galaxy evolution), proto-clusters and gravitationally lensed sources in the optical-to-infrared with observatories including JWST, Herschel, Spitzer and HST.
2. With the recent launch of Euclid, detection and characterization of galaxy clusters, cosmology, galaxy clustering and weak lensing, and the theory of dark energy and gravity.

Active members

At ESAC :

• Bruno Altieri (Euclid SOC)
• Rachana Bhatawdekar (Archives)
• Xavier Dupac (Euclid SOC)
• Marcos López-Caniego (Planck SOC)
• Ana Maria Perez Garcia (CAB)
• Ricardo Pérez Martinez (XMM-Newton SOC)
• Tim Rawle (Ariel SOC)
• Ivan Valtchanov (XMM-Newton SOC)

At ESTEC:

• René Laureijs
• Valeria Pettorino (Euclid Project Scientist)

Contact point: Bruno Altieri

Former members: Irene Pintos-Castro (Univeristy of Toronto), Joana Santos (2013), Miguel Sanchez-Portal (ESO, IRAM, 2017), Luca Conversi (ESRIN,2018), Maggie Lieu (University of  Nottintham, 2019), Ginebra Favole (EPFL, Lausane, 2019), Crispin Logan (ESA Research Fellow,2020)

ESAC trainees: Sophia Milanov (2017), Matej Kosiba (2018), Ditlev Frickmann (2020)

Collaborations

We are involved in several large international collaborations as :

• Euclid (ESA Mission and Consortium)
• JADES: JWST Advanced Deep Extragalactic Survey
• X-CLASS: The XMM Cluster Archive Super Survey
• GOGREEN  (Gemini Observations of Galaxies in Rich Early ENvironments)
• XXL survey (XMM-Newton eXtremenly Large survey​​​)
• Herschel Lensing survey

from low-redshift to high redshift clusters as well as proto-clusters.

Publications

• The X-CLASS survey: A catalogue of 1646 X-ray-selected galaxy clusters up to z ∼ 1.5, Koulouridis et al. (2021)
• Understanding X-ray and optical selection of galaxy clusters: a comparison of the XXL and CAMIRA cluster catalogues obtained in the common XXL-HSC SSP area, Willis et al. (2020)
• UV Spectral-Slopes at z=6−9 in the Hubble Frontier Fields: Lack of Evidence for Unusual or Pop III Stellar Populations, Bhatawdekar & Conselice, MNRAS (2020)
• The XXL Survey. XLIV. Sunyaev-Zel'dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach, Ricci et al. (2020)
• The GOGREEN survey: The environmental dependence of the star-forming galaxy main sequence at 1.0<z<1.5, Old L. et al., MNRAS (2020)
• Multiwavelength classification of X-ray selected galaxy cluster candidates using convolutional neural networks, Kosiba et al., MNRAS (2020)
• The XXL Survey. XXV. Cosmological analysis of the C1 cluster number counts,  Pacaud et al., A&A, 2018
• The XXL Survey. XX. The 365 cluster catalogue, Adami et al., A&A, 2018
• The Spitzer Planck Herschel Infrared Cluster (SPHerIC) survey: candidate galaxy clusters at 1.3 < z < 3 selected by high star-formation rate, Martinache et al., A&A, 2018
• Hierarchical inference of the relationship between concentration and mass in galaxy groups and clusters, Lieu et al, MNRAS, 2017
• A complete census of Herschel-detected infrared sources within the HST Frontier Fields, Rawle et al., MNRAS, 2016
• The XXL survey XV: evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters, Lavoie et al., MNRAS, 2016
• Multi-wavelength landscape of the young galaxy cluster RXJ 1257.2+4738 at z = 0.866. II. Morphological properties, Pintos-Castro et al., A&A, 2016
• The XXL Survey. II. The bright cluster sample: catalogue and luminosity function, Pacaud et al., A&A, 2016

Past workshops and meetings

• Scientific workshop "A multi-wavelength view of galaxy clusters: deriving masses in the era of wide-field surveys", held on September 6-9, 2021.
• The First Spanish Meeting on Galaxy Clusters was held at ESAC on 7 & 8 November 2019