| A Chandra study of the massive,distant galaxy cluster SDSS J0150–1005 |
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| 基金项目： | Supported by the National Natural Science Foundation of China（Grant Nos. 10878001, 10973010 and 11125313）; the National Basic Research Program of China （973 Program; Grant Nos. 2009CB824900 and 2009CB824904）; the Shanghai Science and Technology Commission （Program of Shanghai Subject Chief Scientist; Grant Nos. 12XD1406200 and 11DZ2260700） |
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| 摘 要： | We present a study of a fossil cluster,SDSS J0150–1005（z 0.364）,with high spatial resolution based on the imaging spectroscopic analysis of Chandra observations.The Chandra X-ray image shows a relaxed and symmetric morphology,which indicates that SDSS J0150–1005 is a well-developed galaxy cluster with no sign of a recent merger.According to the isothermal model,its global gas temperature is 5.73±0.80 keV,and the virial mass is 6.23±1.34×1014M⊙.Compared with the polytropic temperature model,the mass calculated based on the isothermal model is overestimated by 49%±11.The central gas entropy,S0.1 r200=143.9±18.3 keV cm2,is significantly lower than the average value of normal galaxy clusters with similar temperatures.Our results indicate that SDSS J0150–1005 formed during an early epoch.
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| 关 键 词： | SDSS 星系团 高空间分辨率 气体温度 等温模型 图像显示 温度模型 化石群 |
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