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Weak Merging Scenario of CLASH Cluster A209

Research in Astronomy and Astrophysics 2024年第4期24卷 174-182页

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 Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Astronomy Beijing Normal UniversityBeijing 100875China Department of Astronomy Yunnan UniversityKunming 650091China INAF—Osservatorio Astrofisico di Arcetri Largo E.Fermi50122 FirenzeItaly Department of Astronomy University of VirginiaP.O.Box 400325CharlottesvilleVA 22904-4325USA

We study the structural and dynamical properties of A209 based on Chandra and XMM-Newton *** obtain detailed temperature,pressure,and entropy maps with the contour binning method,and find a hot region in the NW *** 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 *** 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

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Mock X-Ray Observations of Hot Gas with L-galaxies Semi-analytic Models of Galaxy Formation

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Research in Astronomy and Astrophysics 2023年第7期23卷 37-51页

作者： Wenxin Zhong Jian Fu Shiyin Shen Feng Yuan Key Laboratory for Research in galaxies and Cosmology Shanghai Astronomical ObservatoryCASShanghai 200030China University of Chinese Academy of Sciences Beijing 100049China Key Lab for Astrophysics Shanghai 200034China

We create mock X-ray observations of hot gas in galaxy clusters with a new extension of the L-galaxies semianalytic model of galaxy formation,which includes the radial distribution of hot gas in each *** on the model outputs,we first build some mock light cones,then generate mock spectra with the SOXS package and derive the mock images in the light *** the mock data,we simulate mock X-ray spectra for the ROSAT all-sky survey,and compare the mock spectra with the observational ***,we consider the design parameters of the HUBS mission and simulate the observation of the halo hot gas for HUBS as an important application of our mock *** find:(1)our mock data match the observations by current X-ray telescopes.(2)The survey of hot baryons in resolved clusters by HUBS is effective below redshift 0.5,and the observations of the emission lines in point-like sources at z>0.5 by HUBS help us understand the hot baryons in the early universe.(3)By taking advantage of the large simulation box and flexibility in semi-analytic models,our mock X-ray observations provide the opportunity to select targets and observation strategies for forthcoming X-ray facilities.

关键词： X-rays:galaxies:clusters galaxies:clusters:intracluster medium galaxies:groups:general galaxies:halos (galaxies:)intergalactic medium

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