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题名: MEASURING STRUCTURAL PARAMETERS THROUGH STACKING GALAXY IMAGES
作者: Li, Yubin; Zheng, Xian Zhong; Gu, Qiu-Sheng; Wang, Yi-Peng; Wen, Zhang Zheng; Guo, Kexin; An, Fang Xia
刊名: ASTRONOMICAL JOURNAL
出版日期: 2016
卷号: 152, 期号:6, 页码:201
英文摘要: It 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.
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17068
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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