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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Revising the merger scenario of the galaxy cluster Abell 1644: a new gas poor structure discovered by weak gravitational lensing

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Monteiro-Oliveira, R. [1] ; Doubrawa, L. [1, 2] ; Machado, R. E. G. [2] ; Lima Neto, G. B. [1] ; Castejon, M. [1] ; Cypriano, E. S. [1]
Total Authors: 6
[1] Univ Sao Paulo, Dept Astron, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, BR-05508090 Sao Paulo - Brazil
[2] Univ Tecnol Fed Parana, Rua Sete Setembro 3165, BR-80230901 Curitiba, Parana - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 495, n. 2, p. 2007-2021, JUN 2020.
Web of Science Citations: 0

The galaxy cluster Abell 1644 ((z) over bar = 0.047) is known for its remarkable spiral-like X-ray emission. It was previously identified as a bimodal system, comprising the subclusters, A1644S and A1644N, each one centred on a giant elliptical galaxy. In this work, we present a comprehensive study of this system, including new weak lensing and dynamical data and analysis plus a tailor-made hydrodynamical simulation. The lensing and galaxy density maps showed a structure in the North that could not be seen on the X-ray images. We, therefore, rename the previously known northern halo as A1644N1 and the new one as A1644N2. Our lensing data suggest that those have fairly similar masses: M-200(N1) = 0.90(-0.85)(+0.45) x 10(14) and M-200(N2) = 0.76(-0.75)(+0.37) x 10(14) M-circle dot, whereas the southern structure is the main one: M-200(S) = 1.90(-1.28)(+0.89) x 10(14) M-circle dot. Based on the simulations, fed by the observational data, we propose a scenario where the remarkable X-ray characteristics in the system are the result of a collision between A1644S and A1644N2 that happened similar to 1.6 Gyr ago. Currently, those systems should be heading to a new encounter, after reaching their maximum separation. (AU)

FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program
FAPESP's process: 18/17543-0 - Astrophysics of groups and clusters of galaxies: observations and simulations
Grantee:Gastão Cesar Bierrenbach Lima Neto
Support type: Regular Research Grants