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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.)

Galaxy cluster mergers as triggers for the formation of jellyfish galaxies: case study of the A901/2 system

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Ruggiero, Rafael [1] ; Machado, Rubens E. G. [2] ; Roman-Oliveira, Fernanda V. [3] ; Chies-Santos, Ana L. [3] ; Lima Neto, Gastao B. [1] ; Doubrawa, Lia [2] ; Rodriguez del Pino, Bruno [4]
Total Authors: 7
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, BR-05508090 Sao Paulo - Brazil
[2] Univ Tecnol Fed Parana, Dept Acad Fis, Rua Sete Setentbro 3165, BR-80230901 Curitiba, Parana - Brazil
[3] Univ Fed Rio Grande do Sul, Inst Fis, Dept Astron, Ave Bento Goncalves 9500, BR-91501970 Porto Alegre, RS - Brazil
[4] CSIC INTA, Ctr Astrobiol, E-28850 Madrid - Spain
Total Affiliations: 4
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 484, n. 1, p. 906-914, MAR 2019.
Web of Science Citations: 2

The A901/2 system is a rare case of galaxy cluster interaction, in which two galaxy clusters and two smaller groups are seen in route of collision with each other simultaneously. Within each of the four substructures, several galaxies with features indicative of jellyfish morphologies have been observed. In this paper, we propose a hydrodynamic model for the merger as a whole, compatible with its diffuse X-ray emission, and correlate the gas properties in this model with the locations of the jellyfish galaxy candidates in the real system. We find that jellyfish galaxies seem to be preferentially located near a boundary inside each subcluster where diffuse gas moving along with the subcluster and diffuse gas from the remainder of the system meet. The velocity change in those boundaries is such that a factor of up to similar to 1000 increase in the ram pressure takes place within a few hundred kpc, which could trigger the high rate of gas loss necessary for a jellyfish morphology to emerge. A theoretical treatment of ram pressure stripping in the environment of galaxy cluster mergers has not been presented in the literature so far; we propose that this could be a common scenario for the formation of jellyfish morphologies in such systems. (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