Ages and structural and dynamical parameters of two globular clusters in the M81 group

	Ages and structural and dynamical parameters of two globular clusters in the M81 group
	Ma, Jun1,2 ; Wang, Song1 ; Wu, Zhenyu1,2 ; Zhang, TianMeng1,2 ; Zou, Hu1 ; Zhou, Zhimin1 ; Nie, Jundan1 ; Zhou, Xu1 ; Peng, Xiyang 1; Wang, Jiali1
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2017-07-01
卷号	468 期号:4 页码:4513-4528
关键词	galaxies: evolution galaxies: star clusters: general galaxies: star clusters: individual: M81 galaxies: star clusters: individual: M82
英文摘要	GC-1 and GC-2 are two globular clusters (GCs) in the remote halo of M81 and M82 in the M81 group discovered by Jang et al. using the Hubble Space Telescope (HST) images. These two GCs were observed as part of the Beijing-Arizona-Taiwan-Connecticut (BATC) Multicolor Sky Survey using 14 intermediate-band filters covering a wavelength range of 4000-10 000 angstrom. We accurately determine these two clusters' ages and masses by comparing their spectral energy distributions (from 2267 to 20 000 angstrom, comprising photometric data in the near-ultraviolet of the Galaxy Evolution Explorer, 14 BATC intermediate-band and Two Micron All Sky Survey near-infrared JHK(s) filters) with theoretical stellar population-synthesis models, resulting in ages of 15.50+/-3.20 for GC-1 and 15.10+/-2.70 Gyr for GC-2. The masses of GC-1 and GC-2 obtained here are 1.77-2.04 x 10(6) and 5.20-7.11 x 10(6) M-circle dot, respectively. In addition, the deep observations with the Advanced Camera for Surveys and Wide Field Camera 3 on the HST are used to provide the surface brightness profiles of GC-1 and GC-2. The structural and dynamical parameters are derived from fitting the profiles to three different models; in particular, the internal velocity dispersions of GC-1 and GC-2 are derived, which can be compared with ones obtained based on spectral observations in the future. For the first time, in this paper, the r(h) versus M-V diagram shows that GC-2 is an ultra-compact dwarf in the M81 group.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	COMPACT DWARF GALAXIES ; MASSIVE STAR-CLUSTERS ; SURFACE BRIGHTNESS PROFILES ; LARGE-MAGELLANIC-CLOUD ; FORNAX CLUSTER ; ELLIPTIC GALAXIES ; GALACTIC STELLAR ; MAYALL II=G1 ; OUTER HALO ; M31
收录类别	SCI
语种	英语
WOS记录号	WOS:000402819700060
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8787]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Coll Astron & Space Sci, Beijing 100049, Peoples R China 3.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 4.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 5.Nanjing Normal Univ, Dept Phys, WenYuan Rd 1, Nanjing 210046, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Ma, Jun,Wang, Song,Wu, Zhenyu,et al. Ages and structural and dynamical parameters of two globular clusters in the M81 group[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,468(4):4513-4528.
APA	Ma, Jun.,Wang, Song.,Wu, Zhenyu.,Zhang, TianMeng.,Zou, Hu.,...&Yuan, Qirong.(2017).Ages and structural and dynamical parameters of two globular clusters in the M81 group.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,468(4),4513-4528.
MLA	Ma, Jun,et al."Ages and structural and dynamical parameters of two globular clusters in the M81 group".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 468.4(2017):4513-4528.