Weak Merging Scenario of CLASH Cluster A209  

作　　者：Wen-Cheng Feng Heng Yu Hai-Hui Zhao Xiao-Lan Hou Shu-Mei Jia Cheng-Kui Li Yu-Lin Cheng Paolo Tozzi Ming Sun Yong Chen 

机构地区：[1]Department of Physics and Institute of Theoretical Physics,Nanjing Normal University,Nanjing 210023,China [2]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]Department of Astronomy,Beijing Normal University,Beijing 100875,China [4]Department of Astronomy,Yunnan University,Kunming 650091,China [5]INAF—Osservatorio Astrofisico di Arcetri,Largo E.Fermi,50122 Firenze,Italy [6]Department of Astronomy,University of Virginia,P.O.Box 400325,Charlottesville,VA 22904-4325,USA

出　　处：《Research in Astronomy and Astrophysics》2024年第4期174-182,共9页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(grant Nos.U2038104 and 11703014);the Bureau of International Cooperation,Chinese Academy of Sciences(GJHZ1864)。

摘　　要：We study the structural and dynamical properties of A209 based on Chandra and XMM-Newton observations.We obtain detailed temperature,pressure,and entropy maps with the contour binning method,and find a hot region in the NW direction.The X-ray brightness residual map and corresponding temperature profiles reveal a possible shock front in the NW direction and a cold front feature in the SE direction.Combined with the galaxy luminosity density map we propose a weak merger scenario.A young sub-cluster passing from the SE to NW direction could explain the optical subpeak,the intracluster medium temperature map,the X-ray surface brightness excess,and the X-ray peak offset together.

关 键 词：X rays:galaxies:clusters galaxies:clusters:intracluster medium galaxies:clusters:Abell 209 

分 类 号：P14[天文地球—天体物理]