Probing Saraswati's heart: evaluating the dynamical state of the massive galaxy cluster A2631 through a comprehensive weak-lensing and dynamical analysis

Abstract

In this work, we investigate the dynamical state of the galaxy cluster Abell 2631, a massive structure located at the core of the Saraswati supercluster. To do this, we first solve a tension found in the literature regarding the weak-lensing mass determination of the cluster. We do this through a comprehensive weak-lensing analysis, exploring the power of the combination of shear and magnification data sets. We find $M_{200}^{\mathrm{wl}}=8.7_{-2.9}^{+2.5}\times 10^{14}$ M${}_{\odot }$. We also determined the mass based on the dynamics of spectroscopic members, corresponding to $M_{200}^{\mathrm{dy}}=12.2\pm 3.0\times 10^{14}$ M${}_{\odot }$, consistent within a 68 per cent CL with the weak-lensing estimate. The scenarios provided by the mass distribution and dynamics of galaxies are reconciled with those provided by X-ray observations in a scenario where A2631 is observed at a late stage of merging.

14 pages, 10 figures, 6 tables. Accepted on Nov, 13 for publication in MNRAS

References in corpus (21)

• COSMOS Photometric Redshifts with 30-bands for 2-deg2
• Shocks and cold fronts in galaxy clusters
• The non-gravitational interactions of dark matter in colliding galaxy clusters
• Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 in the Subaru Deep Fields: Photometric Properties
• The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses
• Virial Scaling of Massive Dark Matter Halos: Why Clusters Prefer a High Normalization Cosmology
• The galaxy cluster mass scale and its impact on cosmological constraints from the cluster population
• The relation between velocity dispersion and mass in simulated clusters of galaxies: dependence on the tracer and the baryonic physics
• On the efficiency and reliability of cluster mass estimates based on member galaxies
• GMRT Radio Halo Survey in galaxy clusters at z = 0.2 -- 0.4 I.The REFLEX sub--sample
• LoCuSS: Comparison of Observed X-ray and Lensing Galaxy Cluster Scaling Relations with Simulations
• X-ray properties in massive galaxy clusters: XMM-Newton observations of the REFLEX-DXL sample
• Interloper treatment in dynamical modelling of galaxy clusters
• Major Cluster Mergers and the Location of the Brightest Cluster Galaxy
• Saraswati: An Extremely Massive ~ 200 Megaparsec Scale Supercluster
• Probing the Fundamental Nature of Dark Matter with the Large Synoptic Survey Telescope
• Biases in galaxy cluster velocity dispersion and mass estimates in the small number of galaxies regime
• Simulations of the merging galaxy cluster Abell 2034: what determines the level of separation between gas and dark matter
• Simulations of gas sloshing induced by a newly discovered gas poor substructure in galaxy cluster Abell 1644
• Revising the merger scenario of the galaxy cluster Abell 1644: a new gas poor structure discovered by weak gravitational lensing
• The dynamical state of Abell 2399: a bullet-like cluster

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• Clash of Titans: a MUSE dynamical study of the extreme cluster merger SPT-CL J0307-6225
• MOSS I: Double radio relics in the Saraswati supercluster