TWO-PHASE ICM IN THE CENTRAL REGION OF THE RICH CLUSTER OF GALAXIES A1795: A JOINT CHANDRA, XMM-NEWTON, AND SUZAKU VIEW

	TWO-PHASE ICM IN THE CENTRAL REGION OF THE RICH CLUSTER OF GALAXIES A1795: A JOINT CHANDRA, XMM-NEWTON, AND SUZAKU VIEW
	Gu, Liyi 1,2; Xu, Haiguang 2; Gu, Junhua 2; Kawaharada, Madoka 3; Nakazawa, Kazuhiro 1; Qin, Zhenzhen 2; Wang, Jingying 2; Wang, Yu 4; Zhang, Zhongli5 ; Makishima, Kazuo 1
刊名	ASTROPHYSICAL JOURNAL
	2012-04-01
卷号	749 期号:2 页码:1
关键词	galaxies: clusters: individual (A1795) intergalactic medium magnetic fields X-rays: galaxies: clusters
英文摘要	Based on a detailed analysis of the high-quality Chandra, XMM-Newton, and Suzaku data of the X-ray bright cluster of galaxies A1795, we report clear evidence for a two-phase intracluster medium (ICM) structure, which consists of a cool (with a temperature T-c approximate to 2.0-2.2 keV) and a hot (T-h approximate to 5.0-5.7 keV) component that coexist and dominate the X-ray emission at least in the central 80 kpc. A third weak emission component (T-3 approximate to 0.8 keV) is also detected within the innermost 144 kpc and is ascribed to a portion of interstellar medium of the cD galaxy. Deprojected spectral analysis reveals flat radial temperature distributions for both the hot phase and cool phase components. These results are consistent with the ASCA measurements reported by Xu et al. and resemble the previous findings for the Centaurus Cluster. By analyzing the emission measure ratio and gas metal abundance maps created from the Chandra data, we find that the cool phase component is more metal-enriched than the hot phase one in the 50-100 kpc region, which agrees with that found in M87. The coexistence of the cool phase and hot phase ICM cannot be realized by bubble uplifting from active galactic nuclei (AGNs) alone. Instead, the two-phase ICM properties are better reconciled with a cD corona model. In this model, the cool phase may be ascribed to the plasmas confined in magnetic loops, which are surrounded by the intruding hot phase ICM and have been polluted by metals synthesized in the cD galaxy. AGN feedback energy released in the innermost 10 kpc can serve as the heating source to prevent the loop-interior gas from cooling down to temperatures much lower than the observed value. The total gravitating mass profile exhibits a hierarchical structure, regardless of the ICM temperature modeling.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	X-RAY SPECTROSCOPY ; MULTIPHASE HOT GAS ; CENTAURUS CLUSTER ; ABELL 1795 ; INTRACLUSTER MEDIUM ; DARK-MATTER ; TEMPERATURE STRUCTURE ; BACKGROUND SPECTRUM ; NONHYDROSTATIC GAS ; COOLING CLUSTERS
收录类别	SCI
语种	英语
WOS记录号	WOS:000302785700090
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18134]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130011, Japan 2.Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China 3.Japan Aerosp Explorat Agcy JAXA, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan 4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 5.Max Planck Inst Astrophys, D-85740 Garching, Germany
推荐引用方式 GB/T 7714	Gu, Liyi,Xu, Haiguang,Gu, Junhua,et al. TWO-PHASE ICM IN THE CENTRAL REGION OF THE RICH CLUSTER OF GALAXIES A1795: A JOINT CHANDRA, XMM-NEWTON, AND SUZAKU VIEW[J]. ASTROPHYSICAL JOURNAL,2012,749(2):1.
APA	Gu, Liyi.,Xu, Haiguang.,Gu, Junhua.,Kawaharada, Madoka.,Nakazawa, Kazuhiro.,...&Makishima, Kazuo.(2012).TWO-PHASE ICM IN THE CENTRAL REGION OF THE RICH CLUSTER OF GALAXIES A1795: A JOINT CHANDRA, XMM-NEWTON, AND SUZAKU VIEW.ASTROPHYSICAL JOURNAL,749(2),1.
MLA	Gu, Liyi,et al."TWO-PHASE ICM IN THE CENTRAL REGION OF THE RICH CLUSTER OF GALAXIES A1795: A JOINT CHANDRA, XMM-NEWTON, AND SUZAKU VIEW".ASTROPHYSICAL JOURNAL 749.2(2012):1.