Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Simulations of the merging galaxy cluster Abell 3376

Texto completo
Autor(es):
Machado, Rubens E. G. [1] ; Lima Neto, Gastao B. [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 430, n. 4, p. 3249-3260, APR 2013.
Citações Web of Science: 16
Resumo

Observed galaxy clusters often exhibit X-ray morphologies suggestive of recent interaction with an infalling subcluster. A3376 is a nearby (z = 0.046) massive galaxy cluster whose bullet-shaped X-ray emission indicates that it may have undergone a recent collision. It displays a pair of Mpc-scale radio relics and its brightest cluster galaxy is located 970 h(70)(-1) kpc away from the peak of X-ray emission, where the second brightest galaxy lies. We attempt to recover the dynamical history of A3376. We perform a set of N-body adiabatic hydrodynamical simulations using the smoothed particle hydrodynamics (SPH) code GADGET-2. These simulations of binary cluster collisions are aimed at exploring the parameter space of possible initial configurations. By attempting to match X-ray morphology, temperature, virial mass and X-ray luminosity, we set approximate constraints on some merger parameters. Our best models suggest a collision of clusters with mass ratio in the range 1/6-1/8, and having a subcluster with central gas density four times higher than that of the major cluster. Models with small impact parameter (b < 150 kpc), if any, are preferred. We estimate that A3376 is observed approximately 0.5 Gyr after core passage, and that the collision axis is inclined by i approximate to 40 degrees with respect to the plane of the sky. The infalling subcluster drives a supersonic shock wave that propagates at almost 2600 km s(-1), implying a Mach number as high as M similar to 4; but we show how it would have been underestimated as M similar to 3 due to projection effects. (AU)

Processo FAPESP: 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL
Beneficiário:Elisabete Maria de Gouveia Dal Pino
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
Processo FAPESP: 10/12277-9 - Simulações numéricas de colisões de aglomerados de galáxias
Beneficiário:Rubens Eduardo Garcia Machado
Linha de fomento: Bolsas no Brasil - Pós-Doutorado