A Chandra study of the massive, distant galaxy cluster SDSS J0150–1005  

作　　者：Zhen-Zhen Qin Hai-Guang Xu Jing-Ying Wang Jun-Hua Gu 

机构地区：[1]Department of Physics, Shanghai Jiao Tong University [2]National Astronomical Observatories,Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2013年第10期1155-1162,共8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. 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)

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.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.

关 键 词：galaxies：clusters：general galaxies：evolution galaxies：halos—intergalactic medium X-rays：galaxies：clusters 

分 类 号：P154[天文地球—天文学]