Cosmological Studies from Tomographic Weak Lensing Peak Abundances and Impacts of Photo-z Errors
Yuan,Shuo1; Pan,Chuzhong1; Liu,Xiangkun2; Wang,Qiao3,4; Fan,Zuhui1,2
Source PublicationThe Astrophysical Journal
AbstractAbstract Weak lensing peak abundance analyses have been applied in different surveys and demonstrated to be a powerful statistic in extracting cosmological information complementary to cosmic shear two-point correlation studies. Future large surveys with high number densities of galaxies will enable tomographic peak analyses. Focusing on high peaks, we investigate quantitatively how the tomographic redshift binning can enhance the cosmological gains. We also perform detailed studies about the degradation of cosmological information due to photometric redshift (photo-z) errors. We show that for surveys with a number density of galaxies of ~40 arcmin?2, a median redshift of ~1, and a survey area of ~15,000 deg2, the four-bin tomographic peak analyses can reduce the error contours of (Ωm, σ8) by a factor of 5 compared to 2D peak analyses in the ideal case of the photo-z error being absent. More redshift bins can hardly lead to significantly better constraints. The photo-z error model here is parameterized by zbias and σph and the fiducial values of zbias?=?0.003 and σph?=?0.02 are taken. We find that using tomographic peak analyses can constrain the photo-z errors simultaneously with cosmological parameters. For four-bin analyses, we can obtain σ(zbias)/zbias?~?10% and σ(σph)/σph?~?5% without assuming priors on them. Accordingly, the cosmological constraints on Ωm and σ8 degrade by factors of ~2.2 and ~1.8, respectively, with respect to zero uncertainties on photo-z parameters. We find that the uncertainty of zbias plays a more significant role in degrading the cosmological constraints than that of σph.
Keywordgravitational lensing: weak large-scale structure of universe
WOS IDIOP:0004-637X-884-2-ab40a5
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China;,
2.South-Western Institute for Astronomy Research, Yunnan University, Chenggong District, Kunming 650500, Yunnan Province, People’s Republic of China
3.Key Laboratory of Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
4.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
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GB/T 7714
Yuan,Shuo,Pan,Chuzhong,Liu,Xiangkun,et al. Cosmological Studies from Tomographic Weak Lensing Peak Abundances and Impacts of Photo-z Errors[J]. The Astrophysical Journal,2019,884(2).
APA Yuan,Shuo,Pan,Chuzhong,Liu,Xiangkun,Wang,Qiao,&Fan,Zuhui.(2019).Cosmological Studies from Tomographic Weak Lensing Peak Abundances and Impacts of Photo-z Errors.The Astrophysical Journal,884(2).
MLA Yuan,Shuo,et al."Cosmological Studies from Tomographic Weak Lensing Peak Abundances and Impacts of Photo-z Errors".The Astrophysical Journal 884.2(2019).
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