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Properties of the brightest globular cluster in M 81 based on multicolour observations
Wang, Shoucheng1,2; Ma, Jun1,2
2021-05-28
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume649Pages:10
AbstractContext. Researching the properties of the brightest globular cluster (referred to as GC1) in M 81 can provide a fossil record of the earliest stages of galaxy formation and evolution. The Beijing-Arizona-Taiwan-Connecticut (BATC) Multicolour Sky Survey has carried out deep exposures of M 81.Aims. We derive the magnitudes in intermediate-band filters of the BATC system for GC1 and determine its age, mass, and structural parameters.Methods. GC1 was observed by BATC using 14 intermediate-band filters covering a wavelength range of 4000-10 000 angstrom. Based on photometric data in BATC and Two Micron All Sky Survey near-infrared JHK(s) filters, we constructed an extensive spectral energy distribution of GC1, spanning the wavelength range from 4000 to 20 000 angstrom. By comparing multicolour photometry with theoretical single stellar population synthesis models, we derived the age and mass of GC1. In addition, we obtained ellipticities, position angles, and surface brightness profiles for GC1 based on the images of deep observations with the Advanced Camera for Surveys on the Hubble Space Telescope. GC1 is better fitted by the Wilson model than by the King and Sersic models in the F606W filter, and it is better fitted by the Sersic model than by the King and Wilson models in the F814W filter. The 'best-fit' half-light radius of GC1 obtained here is 5.59 pc, which is larger than the majority of normal globular clusters (GCs) of the same luminosity.Results. The age and mass of GC1 estimated here are 13.0 +/- 2.90 Gyr and 1.06-1.48x10(7) M-circle dot, respectively. The R-h versus M-V diagram shows that GC1 occupies the same area as extended star clusters. Therefore, we suggest that GC1 is more likely an accreted former nuclear star cluster than a classical GC similar to most of those in the Milky Way.
Keywordgalaxies: evolution galaxies: star clusters: individual: globular cluster
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)
DOI10.1051/0004-6361/202140574
WOS KeywordX-RAY OBSERVATIONS ; STAR-CLUSTERS ; STRUCTURAL PARAMETERS ; PHOTOMETRIC EVOLUTION ; BRIGHTNESS PROFILES ; STELLAR POPULATIONS ; STANDARD STARS ; BATC SURVEY ; SYSTEMS ; M81
Language英语
Funding ProjectNational Key R&D Program of China[2019YFA0405501] ; National Natural Science Foundation of China (NSFC)[11873053]
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:000659064400002
PublisherEDP SCIENCES S A
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77564
Collection中国科学院国家天文台
Corresponding AuthorWang, Shoucheng
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Shoucheng,Ma, Jun. Properties of the brightest globular cluster in M 81 based on multicolour observations[J]. ASTRONOMY & ASTROPHYSICS,2021,649:10.
APA Wang, Shoucheng,&Ma, Jun.(2021).Properties of the brightest globular cluster in M 81 based on multicolour observations.ASTRONOMY & ASTROPHYSICS,649,10.
MLA Wang, Shoucheng,et al."Properties of the brightest globular cluster in M 81 based on multicolour observations".ASTRONOMY & ASTROPHYSICS 649(2021):10.
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