Simulations of gas sloshing in galaxy cluster Abell 2052

Autor(es)

Machado, Rubens E. G. ^[1] ; Lima Neto, Gastao B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 447, n. 3, p. 2915-2924, MAR 1 2015.
• Citações Web of Science: 10

Resumo

The intracluster plasma of Abell 2052 exhibits in X-rays a spiral structure extending more than 250 kpc, which is comprised of cool gas. This feature is understood to be the result of gas sloshing caused by the off-axis collision with a smaller subcluster. We aim to recover the dynamical history of Abell 2052 and to reproduce the broad morphology of the spiral feature. To this end, we perform hydrodynamical N-body simulations of cluster collisions. We obtain two regimes that adequately reproduce the desired features. The first scenario is a close encounter and a recent event (0.8 Gyr since pericentric passage), while the second scenario has a larger impact parameter and is older (almost 2.6 Gyr since pericentric passage). In the second case, the simulation predicts that the perturbing subcluster should be located approximately 2 Mpc from the centre of the major cluster. At that position, we are able to identify an observed optical counterpart at the same redshift: a galaxy group with M-500 =(1.16 +/- 0.43) x10(13) M-circle dot. (AU)

• 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