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New Determination of Fundamental Properties of Palomar 5 Using Deep DESI Imaging Data
Xu,Xin1,2; Zou,Hu1; Zhou,Xu1; Nie,Jundan1; Zhou,Zhimin1; Ma,Jun1,2; Zhang,Tianmeng1; Wang,Jiali1; Xue,Suijian1
2020-12-03
Source PublicationThe Astronomical Journal
ISSN0004-6256
Volume161Issue:1
AbstractAbstract The legacy imaging surveys for the Dark Energy Spectroscopic Instrument project provides multiple-color photometric data, which are about 2 mag deeper than those from the SDSS. In this study, we redetermine the fundamental properties for an old halo globular cluster of Palomar 5 based on these new imaging data, including structure parameters, stellar population parameters, and luminosity and mass functions. These characteristics, together with its tidal tails, are key for dynamical studies of the cluster and constraining the mass model of the Milky Way. By fitting the King model to the radial surface density profile of Palomar 5, we derive the core radius of , tidal radius of , and concentration parameter of c?=?0.78?±?0.04. We apply a Bayesian analysis method to derive the stellar population properties and get an age of 11.508?±?0.027 Gyr, metallicity of [Fe/H] ?=? ??1.798?±?0.014, reddening of E(B???V)?=?0.0552?±?0.0005, and distance modulus of . The main-sequence luminosity and mass functions for both the cluster center and tidal tails are investigated. The luminosity and mass functions at different distances from the cluster center suggest that there is obvious spatial mass segregation. Many faint low-mass stars have been evaporated at the cluster center, and the tidal tails are enhanced by low-mass stars. Both the concentration and relaxation times suggest that Palomar 5 is a totally relaxed system.
KeywordGlobular star clusters CCD photometry Stellar populations Stellar mass functions
DOI10.3847/1538-3881/abc829
Language英语
WOS IDIOP:0004-6256-161-1-abc829
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/61088
Collection中国科学院国家天文台
Corresponding AuthorZou,Hu
Affiliation1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China zouhu@nao.cas.cn
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xu,Xin,Zou,Hu,Zhou,Xu,et al. New Determination of Fundamental Properties of Palomar 5 Using Deep DESI Imaging Data[J]. The Astronomical Journal,2020,161(1).
APA Xu,Xin.,Zou,Hu.,Zhou,Xu.,Nie,Jundan.,Zhou,Zhimin.,...&Xue,Suijian.(2020).New Determination of Fundamental Properties of Palomar 5 Using Deep DESI Imaging Data.The Astronomical Journal,161(1).
MLA Xu,Xin,et al."New Determination of Fundamental Properties of Palomar 5 Using Deep DESI Imaging Data".The Astronomical Journal 161.1(2020).
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