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

被引：2

作者：

Abriola, Davide ^{[1
]}

Della Pergola, Daniele ^{[1
]}

Lombardi, Marco ^{[1
]}

Bergamini, Pietro ^{[1
,2
]}

Nonino, Mario ^{[3
]}

Grillo, Claudio ^{[1
,4
]}

Rosati, Piero ^{[2
,5
]}

机构：

[1] Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan, Italy

[2] INAF OAS, Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy

[3] INAF OAT, Osservatorio Astron Trieste, via GB Tiepolo 11, I-34131 Trieste, Italy

[4] INAF IASF Milano, Via A Corti 12, I-20133 Milan, Italy

[5] Univ Ferrara, Dipartimento Fis & Sci Terra, Via Saragat 1, I-44122 Ferrara, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 684卷

关键词：

gravitation; gravitational lensing: weak; galaxies: clusters: individual: Abell 2744; cosmology: observations; dark matter; FRONTIER-FIELDS; MASS RECONSTRUCTION; SURVEY DESIGN; RADIO HALO; SUBARU; HUBBLE; RELEASE; CONSTRAINTS; CANDIDATES; PROFILES;

D O I：

10.1051/0004-6361/202347887

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 carried out our study by applying brand-new PSF and shape measurement software that allow the use of multi-band data simultaneously, which we first tested on Subaru/Suprime-Cam BR(c)z ' 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)x10(15) M-circle dot, 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 megaparsecs from the BCG centre.

引用

页数：11

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