An improved Magellan weak lensing analysis of the galaxy cluster Abell 2744

2024/02/13 by Abriola, Davide, Della Pergola, Daniele, Lombardi, Marco +4
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2402.08364

Abstract

We present a new weak lensing analysis of the Hubble Frontier Fields galaxy cluster Abell 2744 (z = 0.308) using new Magellan/MegaCam multi-band gri imaging data. We carry out our study by applying brand-new PSF and shape measurement softwares that allow for the use of multi-band data simultaneously, which we first test on Subaru/Suprime-Cam BR_cz' imaging data of the same cluster. The projected total mass of this system within 2.35 Mpc from the south-west BCG is (2.56 ± 0.26) × 10¹⁵ M_\odot, which makes Abell 2744 one of the most massive clusters known. This value is consistent, within the errors, with previous weak lensing and dynamical studies. Our analysis reveals the presence of three high-density substructures, thus supporting the picture of a complex merging scenario. This result is also confirmed by a comparison with a recent strong lensing study based on high-resolution JWST imaging. Moreover, our reconstructed total mass profile nicely agrees with an extrapolation of the strong lensing best-fit model up to several Mpc from the BCG centre.

Related

• Precision MARS Mass Reconstruction of Abell 2744: Synergizing the Largest Strong Lensing and Densest Weak Lensing Datasets from JWST
• Strong and weak lensing analysis of cluster Abell 2219 based on optical and near infrared data
• Weak lensing analysis of A115, A2219 and A2261: Detection of galaxy groups and filaments around clusters
• Weak lensing study of Abell 2029
• Weak-Lensing Analysis of the Galaxy Cluster Abell 85: Constraints on the Merger Scenarios of Its Southern Subcluster