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Structural parameters for the globular-cluster-like objects in NGC 1052-DF2
Ma, Jun1,2; Wang, Shoucheng1,2; Wang, Song1; Zhou, Zhimin1; Zhang, Tianmeng1,2; Nie, Jundan1; Zou, Hu1; Zhou, Xu1; Du, Cuihua2; Wang, Jiali1; Wu, Jianghua3
2020-08-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume496Issue:3Pages:3741-3754
AbstractRecently, van Dokkum et al. have found an ultra-diffuse galaxy NGC 1052-DF2 with little or no dark matter, based on a spectroscopic study of its 11 constituent globular-cluster-like objects. In this paper, we analyse these 11 objects using Hubble Space Telescope imaging. We derive the structural parameters for each object by fitting the surface brightness profiles to three different models. Our results indicate that these objects are better fitted by the Wilson model than by the King and S ' ersic models. Using the distance of D = 20 Mpc to NGC 1052-DF2 obtained by van Dokkum et al., these 11 objects have half-light radii in the range from similar to 11 to similar to 16 pc. These values are much larger than for normal globular clusters in the MilkyWay, and are comparable to the sizes of an extended star cluster and of a typical ultra-compact dwarf. The half-light radii obtained here are larger than those obtained by van Dokkum et al. and Trujillo et al. The offset of the differences between the half-light radii of van Dokkum et al. and ours is 6.17 pc, and the offset of the differences between the half-light radii of Trujillo et al. and ours is 4.99 pc. Our half-light radii are, on average, 11.74 pc, which corresponds to 53 and 43 per cent larger than those obtained by van Dokkum et al. and Trujillo et al., respectively. The Rh versus MV diagram shows that these objects occupy the same areas of extended star clusters and ultra-compact dwarfs. Using the distance of D = 13 Mpc obtained by Trujillo et al., there are still five objects that do not lie in the area of normal globular clusters in the Milky Way. So, we suggest that these globular-cluster-like objects in NGC 1052-DF2 are not normal globular clusters like those in the Milky Way.
Keywordgalaxies: evolution galaxies: star clusters: general galaxies: star clusters: individual: NGC 1052-DF2
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
DOI10.1093/mnras/staa1775
WOS KeywordULTRA-DIFFUSE GALAXIES ; SURFACE BRIGHTNESS PROFILES ; MASSIVE STAR-CLUSTERS ; DARK-MATTER ; FORNAX CLUSTER ; DWARF GALAXIES ; MAYALL II=G1 ; BLACK-HOLE ; POPULATION ; HALO
Language英语
Funding ProjectNational Key R&D Program of China[2019YFA0405501] ; National Natural Science Foundation of China (NSFC)[11873053] ; National Natural Science Foundation of China (NSFC)[11603035] ; National Natural Science Foundation of China (NSFC)[11973042] ; National Natural Science Foundation of China (NSFC)[11890693] ; National Natural Science Foundation of China (NSFC)[11890691]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000574919300072
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81848
Collection中国科学院国家天文台
Corresponding AuthorMa, Jun; Zhou, Zhimin
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, 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
Recommended Citation
GB/T 7714
Ma, Jun,Wang, Shoucheng,Wang, Song,et al. Structural parameters for the globular-cluster-like objects in NGC 1052-DF2[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,496(3):3741-3754.
APA Ma, Jun.,Wang, Shoucheng.,Wang, Song.,Zhou, Zhimin.,Zhang, Tianmeng.,...&Wu, Jianghua.(2020).Structural parameters for the globular-cluster-like objects in NGC 1052-DF2.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,496(3),3741-3754.
MLA Ma, Jun,et al."Structural parameters for the globular-cluster-like objects in NGC 1052-DF2".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 496.3(2020):3741-3754.
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