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MEASURING STRUCTURAL PARAMETERS THROUGH STACKING GALAXY IMAGES
Li, Yubin1,2; Zheng, Xian Zhong1; Gu, Qiu-Sheng3,4; Wang, Yi-Peng3,4; Wen, Zhang Zheng1,2; Guo, Kexin1; An, Fang Xia1,2
2016-12-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume152Issue:6Pages:15
Corresponding AuthorZheng, Xian Zhong(xzzheng@pmo.ac.cn)
AbstractIt remains challenging to detect the low surface brightness structures of faint high-z galaxies, which are key to understanding the structural evolution of galaxies. The technique of image stacking allows us to measure the averaged light profile beneath the detection limit and probe the extended structure of a group of galaxies. We carry out simulations to examine the recovery of the averaged surface brightness profile through stacking model Hubble Space Telescope/Advanced Camera for Surveys images of a set of galaxies as functions of the Sersic index (n), effective radius (R-e) and axis ratio (AR). The Sersic profile best fitting the radial profile of the stacked image is taken as the recovered profile, in comparison with the intrinsic mean profile of the model galaxies. Our results show that, in general, the structural parameters of the mean profile can be properly determined through stacking, though systematic biases need to be corrected when spreads of R-e and AR are counted. We find that the Sersic index is slightly overestimated and R-e is underestimated at AR < 0.5 because the stacked image appears to be more compact due to the presence of inclined galaxies; the spread of Re biases the stacked profile to have a higher Sersic index. We stress that the measurements of structural parameters through stacking should take these biases into account. We estimate the biases in the recovered structural parameters from stacks of galaxies when the samples have distributions of R-e, AR and n seen in local galaxies.
Keywordgalaxies: photometry Galaxy: evolution Galaxy: structure
DOI10.3847/0004-6256/152/6/201
WOS KeywordDIGITAL SKY SURVEY ; STAR-FORMING GALAXIES ; HUBBLE-SPACE-TELESCOPE ; EXTRAGALACTIC LEGACY SURVEY ; MASS-METALLICITY RELATION ; INSIDE-OUT GROWTH ; SIMILAR-TO 2 ; QUIESCENT GALAXIES ; ELLIPTIC GALAXIES ; SIZE EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000390360900004
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23375
Collection中国科学院紫金山天文台
Corresponding AuthorZheng, Xian Zhong
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
4.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, Yubin,Zheng, Xian Zhong,Gu, Qiu-Sheng,et al. MEASURING STRUCTURAL PARAMETERS THROUGH STACKING GALAXY IMAGES[J]. ASTRONOMICAL JOURNAL,2016,152(6):15.
APA Li, Yubin.,Zheng, Xian Zhong.,Gu, Qiu-Sheng.,Wang, Yi-Peng.,Wen, Zhang Zheng.,...&An, Fang Xia.(2016).MEASURING STRUCTURAL PARAMETERS THROUGH STACKING GALAXY IMAGES.ASTRONOMICAL JOURNAL,152(6),15.
MLA Li, Yubin,et al."MEASURING STRUCTURAL PARAMETERS THROUGH STACKING GALAXY IMAGES".ASTRONOMICAL JOURNAL 152.6(2016):15.
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