An improved Magellan weak lensing analysis of the galaxy cluster Abell 2744
arxiv(2024)
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 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) × 10^15 M_⊙, 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.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要