Group-scale asymmetric abundance structures in the NGC 533 group  

作　　者：Jun-Hua Gu Hai-Guang Xu Jing-Ying Wang Yu Wang Shao-Feng Xu Zhen-Zhen Qin Li-Yi Gu Tao An Zhong-Li Zhang Min Lei 

机构地区：[1]Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China [2]Shanghai Astronomical Observatory, Shanghai 200030, China. [3]Department of Physics, School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku,Tokyo 113-0033, Japan [4]Max-Planck-Institute of Astrophysics, Karl-Schwarzschild-Str. 1, Postfach 1317, 85741Garching, Munich, Germany [5]School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

出　　处：《Research in Astronomy and Astrophysics》2012年第1期63-74,共12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);Shanghai Jiao Tong University Innovation Fund For Postgraduates

摘　　要：By performing a two dimensional spectral analysis on the galaxy group NGC 533 with high-quality Chandra data, we find that the metal abundance distribution in this group is anisotropic. In the area around 2.5′ from the center, we find two concentrations of high abundance structures, in which the abundances are significantly higher than their surrounding regions at the 90% confidence level. We find that the total iron mass in these two regions agrees with the iron mass synthesized in the central dominant galaxy in n 19＋0.08 Gyr. The double-sided configuration of the high abun- 0.03 dance structure, together with the point-like radio emission in the center suggests that the abundance structures could have been transported from the center to their present positions by active galactic nucleus （AGN） activity. We further calculate the energy required for transport, and find that it could have been supplied during an AGN period. However, considering that this group is reported to have experienced a recent merger, the possibility that this merger is responsible for the abundance structures still cannot be excluded.By performing a two dimensional spectral analysis on the galaxy group NGC 533 with high-quality Chandra data, we find that the metal abundance distribution in this group is anisotropic. In the area around 2.5′ from the center, we find two concentrations of high abundance structures, in which the abundances are significantly higher than their surrounding regions at the 90% confidence level. We find that the total iron mass in these two regions agrees with the iron mass synthesized in the central dominant galaxy in n 19＋0.08 Gyr. The double-sided configuration of the high abun- 0.03 dance structure, together with the point-like radio emission in the center suggests that the abundance structures could have been transported from the center to their present positions by active galactic nucleus （AGN） activity. We further calculate the energy required for transport, and find that it could have been supplied during an AGN period. However, considering that this group is reported to have experienced a recent merger, the possibility that this merger is responsible for the abundance structures still cannot be excluded.

关 键 词：galaxies： clusters： individual （NGC 533） -- galaxy： abundances -- in-tergalactic medium -- X-rays： galaxies： clusters 

分 类 号：TU244.3[建筑科学—建筑设计及理论] TS952.83[轻工技术与工程]