A CHANDRA STUDY OF TEMPERATURE SUBSTRUCTURES IN INTERMEDIATE-REDSHIFT GALAXY CLUSTERS
文献类型：期刊论文
| 作者 | Gu, Liyi1; Xu, Haiguang1; Gu, Junhua1 ; Wang, Yu1; Zhang, Zhongli2; Wang, Jingying1; Qin, Zhenzhen1; Cui, Haijuan1; Wu, Xiang-Ping3
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2009-08-01 |
| 卷号 | 700期号:2页码:1161-1172 |
| 关键词 | galaxies: clusters: general intergalactic medium techniques: image processing X-rays: galaxies: clusters |
| 英文摘要 | By analyzing the gas temperature maps created from the Chandra archive data, we reveal the prevailing existence of temperature substructures on similar to 100 h(70)(-1) kpc scales in the central regions of nine intermediate-redshift (z approximate to 0.1) galaxy clusters, which resemble those found in the Virgo and Coma Clusters. Each substructure contains a clump of hot plasma whose temperature is about 2-3 keV higher than the environment, corresponding to an excess thermal energy of similar to 10(58)-10(60) erg per clump. If there were no significant nongravitational heating sources, these substructures would have perished in 10(8)-10(9) yr due to thermal conduction and turbulent flows, whose velocity is found to range from about 200 to 400 km s(-1), we conclude that the substructures cannot be created and sustained by inhomogeneous radiative cooling. We also eliminate the possibilities that the temperature substructures are caused by supernova explosions, or by the nonthermal X-ray emission due to the inverse-Comptonization of the cosmic microwave background photons. By calculating the rising time of active galactic nucleus (AGN)-induced buoyant bubbles, we speculate that the intermittent AGN outbursts (>= 10(60) erg per burst) may have played a crucial role in the formation of the high-temperature substructures. Our results are supported by the recent study of McNamara and Nulsen, posing a tight observational constraint on future theoretical and numerical studies. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000268098100027 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7488]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China 2.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gu, Liyi,Xu, Haiguang,Gu, Junhua,et al. A CHANDRA STUDY OF TEMPERATURE SUBSTRUCTURES IN INTERMEDIATE-REDSHIFT GALAXY CLUSTERS[J]. ASTROPHYSICAL JOURNAL,2009,700(2):1161-1172. |
| APA | Gu, Liyi.,Xu, Haiguang.,Gu, Junhua.,Wang, Yu.,Zhang, Zhongli.,...&Wu, Xiang-Ping.(2009).A CHANDRA STUDY OF TEMPERATURE SUBSTRUCTURES IN INTERMEDIATE-REDSHIFT GALAXY CLUSTERS.ASTROPHYSICAL JOURNAL,700(2),1161-1172. |
| MLA | Gu, Liyi,et al."A CHANDRA STUDY OF TEMPERATURE SUBSTRUCTURES IN INTERMEDIATE-REDSHIFT GALAXY CLUSTERS".ASTROPHYSICAL JOURNAL 700.2(2009):1161-1172. |
入库方式： OAI收割
来源：国家天文台
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