A high-abundance arc in the compact group of galaxies HCG 62: An AGN- or merger-induced metal outflow?

	A high-abundance arc in the compact group of galaxies HCG 62: An AGN- or merger-induced metal outflow?
	Gu, Junhua; Xu, Haiguang ; Gu, Liyi ; An, Tao ; Wang, Yu ; Zhang, Zhongli ; Wu, Xiang-Ping
刊名	ASTROPHYSICAL JOURNAL
	2007-04-10
卷号	659 期号:1 页码:275-282
关键词	galaxies : clusters : individual ( HCG 62) ISM : abundances X-rays : galaxies
英文摘要	We present a Chandra study of the metal distribution in the X-ray bright compact group of galaxies HCG 62. We find that the diffuse X-ray emission is peaked at the core of the central galaxy NGC 4778 and is dominated by the contribution of the hot gas. The diffuse emission is roughly symmetric within similar or equal to 0.25', which is straddled by double-sided X-ray cavities aligned in the northeast-southwest direction. By mapping the emission hardness ratio distributions and by performing a two-dimensional spectral analysis, we identify a remarkable high-abundance arc region at about 2' (33: 6 h(70)(-1) kpc) from the X-ray peak that spans over a vast region from south to northwest, a part of which roughly coincides with the outer edge of the southwest X-ray cavity. The measured average abundance in this arc is higher than that in its neighboring regions by a factor of about 2, and the abundance ratios therein are nicely consistent with the dominance of the SN Ia yields. We estimate that the mass of iron contained in the arc is > 3 x 10(6) h(70)(-2.5) M-circle dot, which accounts for > 3% of the iron synthesized in the galaxy. The high-abundance arc could have been formed by AGN activity. However, it is also possible that the arc was formed in a recent merger, as implied by the recent optical kinematic study by Spavone and colleagues, which suggests that mergers may be as important as AGN activity in metal redistributions in early-type galaxies and their associated groups or clusters.
收录类别	SCI
语种	英语
WOS记录号	WOS:000245773300022
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7227]
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.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Gu, Junhua,Xu, Haiguang,Gu, Liyi,et al. A high-abundance arc in the compact group of galaxies HCG 62: An AGN- or merger-induced metal outflow?[J]. ASTROPHYSICAL JOURNAL,2007,659(1):275-282.
APA	Gu, Junhua.,Xu, Haiguang.,Gu, Liyi.,An, Tao.,Wang, Yu.,...&Wu, Xiang-Ping.(2007).A high-abundance arc in the compact group of galaxies HCG 62: An AGN- or merger-induced metal outflow?.ASTROPHYSICAL JOURNAL,659(1),275-282.
MLA	Gu, Junhua,et al."A high-abundance arc in the compact group of galaxies HCG 62: An AGN- or merger-induced metal outflow?".ASTROPHYSICAL JOURNAL 659.1(2007):275-282.