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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, Xiyang1; Wang, Jiali1; Wu, Jianghua3; Du, Cuihua4; Yuan, Qirong5
2017-07-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume468Issue:4Pages:4513-4528
AbstractGC-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.
SubtypeArticle
KeywordGalaxies: Evolution Galaxies: Star Clusters: General Galaxies: Star Clusters: Individual: M81 Galaxies: Star Clusters: Individual: M82
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundation of China (NSFC)(11373035 ; National Natural Science Foundation of China (NSFC)(11373035 ; National Basic Research Program of China (973 Program)(2014CB845702 ; National Basic Research Program of China (973 Program)(2014CB845702 ; 11603035 ; 11603035 ; 2014CB845704 ; 2014CB845704 ; 11373033 ; 11373033 ; 2013CB834902) ; 2013CB834902) ; 11433005 ; 11433005 ; 11673027 ; 11673027 ; 11603034) ; 11603034) ; National Natural Science Foundation of China (NSFC)(11373035 ; National Natural Science Foundation of China (NSFC)(11373035 ; National Basic Research Program of China (973 Program)(2014CB845702 ; National Basic Research Program of China (973 Program)(2014CB845702 ; 11603035 ; 11603035 ; 2014CB845704 ; 2014CB845704 ; 11373033 ; 11373033 ; 2013CB834902) ; 2013CB834902) ; 11433005 ; 11433005 ; 11673027 ; 11673027 ; 11603034) ; 11603034)
DOI10.1093/mnras/stx761
WOS KeywordCOMPACT DWARF GALAXIES ; MASSIVE STAR-CLUSTERS ; SURFACE BRIGHTNESS PROFILES ; LARGE-MAGELLANIC-CLOUD ; FORNAX CLUSTER ; ELLIPTIC GALAXIES ; GALACTIC STELLAR ; MAYALL II=G1 ; OUTER HALO ; M31
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China (NSFC)(11373035 ; National Natural Science Foundation of China (NSFC)(11373035 ; National Basic Research Program of China (973 Program)(2014CB845702 ; National Basic Research Program of China (973 Program)(2014CB845702 ; 11603035 ; 11603035 ; 2014CB845704 ; 2014CB845704 ; 11373033 ; 11373033 ; 2013CB834902) ; 2013CB834902) ; 11433005 ; 11433005 ; 11673027 ; 11673027 ; 11603034) ; 11603034) ; National Natural Science Foundation of China (NSFC)(11373035 ; National Natural Science Foundation of China (NSFC)(11373035 ; National Basic Research Program of China (973 Program)(2014CB845702 ; National Basic Research Program of China (973 Program)(2014CB845702 ; 11603035 ; 11603035 ; 2014CB845704 ; 2014CB845704 ; 11373033 ; 11373033 ; 2013CB834902) ; 2013CB834902) ; 11433005 ; 11433005 ; 11673027 ; 11673027 ; 11603034) ; 11603034)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000402819700060
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8787
Collection光学天文研究部
Affiliation1.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
Recommended Citation
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.
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