Combined strong and weak gravitational lensing mass measurements in clusters of galaxies
Contributo in Atti di convegno
Data di Pubblicazione:
2022
Citazione:
Combined strong and weak gravitational lensing mass measurements in clusters of galaxies / D. Abriola (PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION). - In: Strong Gravitational Lensing in the Era of Big Data[s.l] : Cambridge University Press, 2022 Dec. - pp. 79-84 [10.1017/S1743921323004052]
Abstract:
Gravitational lensing in clusters of galaxies is one of the most powerful methods to probe the dark matter mass distribution inside such systems, after mapping the baryonic component, and test the currently accepted ΛCDM cosmological paradigm. With the advent of new high-resolution facilities such as the JWST, strong lensing (SL) is capable of providing extremely accurate mass measurements in the densest regions of such structures. Weak lensing (WL) provides complementary information by measuring the total mass distribution in the outskirts of galaxy clusters, where no multiple images of background sources are produced. In my talk, I will present updates on the WL mass reconstruction of the Frontier Fields galaxy cluster Abell 2744 (z = 0.308) based on Subaru, Magellan, and JWST data, and I will show how the results obtained, combined with accurate SL modeling of this lens, provide a consistent picture of the cluster total mass distribution. I will discuss the pipeline used for this work, the extensive checks performed on the different datasets and the scientific results obtained. Being composed of several substructures undergoing a merging process, the complex geometry of this cluster makes it an ideal laboratory to verify the consistency and reliability of the results obtained with the two methods. I will compare the predictions of the SL models extrapolated in the outer regions of the cluster with the non-parametric WL mass reconstruction to look for potential systematic effects affecting the SL analysis.
Tipologia IRIS:
03 - Contributo in volume
Keywords:
Cosmology: observations; dark matter; Galaxies: clusters: individual (Abell 2744); Gravitational lensing: weak
Elenco autori:
D. Abriola
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Link al Full Text:
Titolo del libro:
Strong Gravitational Lensing in the Era of Big Data