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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.)

Simulating the shocks in the dissociative galaxy cluster Abell 1758N

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Machado, R. E. G. [1, 2] ; Monteiro-Oliveira, R. [1] ; Lima Neto, G. B. [1] ; Cypriano, E. S. [1]
Total Authors: 4
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
[2] Univ Andres Bello, Dept Fis & Ciencia Mat, Dept Ciencias Fis, Santiago - Chile
Total Affiliations: 2
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 451, n. 3, p. 3309-3320, AUG 11 2015.
Web of Science Citations: 8

Major mergers between massive clusters have a profound effect in the intracluster gas, which may be used as a probe of the dynamics of structure formation at the high end of the mass function. An example of such a merger is observed at the northern component of Abell 1758, comprising two massive sub-clusters separated by approximately 750 kpc. One of the clusters exhibits an offset between the dark matter and the intracluster gas. We aim to determine whether it is possible to reproduce the specific morphological features of this cluster by means of a major merger. We perform dedicated SPH (smoothed particle hydrodynamics) N-body simulations in an attempt to simultaneously recover several observed features of Abell 1758, such as the X-ray morphology and the separation between the two peaks in the projected galaxy luminosity map. We propose a specific scenario for the off-axis collision of two massive clusters. This model adequately reproduces several observed features and suggests that Abell 1758 is seen approximately 0.4 Gyr after the first pericentric passage, and that the clusters are already approaching their maximum separation. This means that their relative velocity is as low as 380 km s(-1). At the same time, the simulated model entails shock waves of similar to 4500 km s(-1), which are currently undetected presumably due to the low-density medium. We explain the difference between these velocities and argue that the predicted shock fronts, while plausible, cannot be detected from currently available data. (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: 14/13723-3 - Galaxy clusters as portals to the dark universe
Grantee:Eduardo Serra Cypriano
Support type: Regular Research Grants
FAPESP's process: 10/12277-9 - Numerical simulations of galaxy cluster mergers
Grantee:Rubens Eduardo Garcia Machado
Support type: Scholarships in Brazil - Post-Doctorate