Search Results - "Li, Hekun"

Mitigating the Noise-source Coupling Effect in Shear Measurement by Li, Hekun, Zhang, Jun

“…Abstract Subpercent level accuracy in shear measurement is required by the Stage-IV weak lensing surveys. One important challenge is suppressing the shear bias…”
Get full text

Toward an Optimal Reconstruction of the Shear Field with PDF-folding by Wang, Haoran, Zhang, Jun, Li, Hekun, Liu, Cong

“…Abstract Weak lensing provides a direct way of mapping the density distribution in the Universe. To reconstruct the density field from the shear catalog, an…”
Get full text

Dark against Luminous Matter around Isolated Central Galaxies: A Comparative Study between Modern Surveys and IllustrisTNG by Alonso, Pedro, Wang, Wenting, Zhang, Jun, Li, Hekun, Shao, Shi, Guo, Qi, He, Yanqin, Hao, Cai-Na, Shi, Rui

“…Abstract Based on independent shear measurements using the Dark Energy Camera Legacy Survey/DR8 imaging data, we measure the weak lensing signals around…”
Get full text

Avoiding the Geometric Boundary Effect in Shear Measurement by Wang, Haoran, Zhang, Jun, Li, Hekun, Shen, Zhi

“…Abstract In image processing, source detections are inevitably affected by the presence of the geometric boundaries in the images, including the physical…”
Get full text

First measurement of the characteristic depletion radius of dark matter haloes from weak lensing by Fong, Matthew, Han, Jiaxin, Zhang, Jun, Yang, Xiaohu, Gao, Hongyu, Wang, Jiaqi, Li, Hekun, Katsianis, Antonios, Alonso, Pedro

“…ABSTRACT We use weak lensing observations to make the first measurement of the characteristic depletion radius, one of the three radii that characterize the…”
Get full text

Quasi-2D weak lensing cosmological constraints using the PDF-SYM method by Liu, Zhenjie, Zhang, Jun, Li, Hekun, Shen, Zhi, Liu, Cong

“…Cosmic shear statistics, such as the two-point correlation function (2PCF), can be evaluated with the PDF-SYM method instead of the traditional weighted-sum…”
Get full text

Toward a Bias-free Selection Criterion in Shear Measurement by Li, Hekun, Zhang, Jun, Liu, Dezi, Luo, Wentao, Zhang, Jiajun, Dong, Fuyu, Shen, Zhi, Wang, Haoran

“…Sample selection is a necessary preparation for weak lensing measurement. It is well-known that selection itself may introduce bias to the measured shear…”
Get full text

Satellite content and halo mass of galaxy clusters: comparison between red-sequence and halo-based optical cluster finders by Golden-Marx, Jesse B, Zu, Ying, Wang, Jiaqi, Li, Hekun, Zhang, Jun, Yang, Xiaohu

“…ABSTRACT Cluster cosmology depends critically on how optical clusters are selected from imaging surveys. We compare the conditional luminosity function (CLF)…”
Get full text

Shear Measurement with Poorly Resolved Images by Zhang, Jun, Liu, Cong, Vaquero, Pedro Alonso, Li, Hekun, Wang, Haoran, Shen, Zhi, Dong, Fuyu

“…Abstract Weak lensing studies typically require excellent seeing conditions for the purpose of maximizing the number density of well-resolved galaxy images. It…”
Get full text

Testing Shear Recovery with Field Distortion by Zhang, Jun, Dong, Fuyu, Li, Hekun, Li, Xiangchong, Li, Yingke, Liu, Dezi, Luo, Wentao, Fu, Liping, Li, Guoliang, Fan, Zuhui

“…The tilt, rotation, or offset of each CCD with respect to the focal plane, as well as the distortion of the focal plane itself, causes shape distortions in the…”
Get full text

Tolerance For the Pixelation Effect in Shear Measurement by Shen, Zhi, Zhang, Jun, Li, Hekun, Wang, Haoran, Wei, Chengliang, Li, Guoliang, Li, Xiaobo, Ban, Zhang, Yue, Dan

“…Abstract Images taken by space telescopes typically have a superb spatial resolution, but a relatively poor sampling rate due to the finite CCD pixel size…”
Get full text

Constraining Dark Energy with Stacked Concave Lenses by Dong, Fuyu, Zhang, Jun, Yu, Yu, Yang, Xiaohu, Li, HeKun, Han, Jiaxin, Luo, Wentao, Zhang, Jiajun, Fu, Liping

“…Low-density regions are less affected by the nonlinear structure formation and baryonic physics. They are ideal places for probing the nature of dark energy, a…”
Get full text

First measurement of the characteristic depletion radius of dark matter haloes from weak lensing by Fong, Matthew, Han, Jiaxin, Zhang, Jun, Yang, Xiaohu, Gao, Hongyu, Wang, Jiaqi, Li, Hekun, Katsianis, Antonios, Alonso, Pedro

“…ABSTRACT We use weak lensing observations to make the first measurement of the characteristic depletion radius, one of the three radii that characterize the…”
Get full text

Halo Properties and Mass Functions of Groups/Clusters from the DESI Legacy Imaging Surveys DR9 by Wang, Jiaqi, Yang, Xiaohu, Zhang, Jun, Li, Hekun, Fong, Matthew, Xu, Haojie, He, Min, Gu, Yizhou, Luo, Wentao, Dong, Fuyu, Wang, Yirong, Li, Qingyang, Katsianis, Antonios, Wang, Haoran, Shen, Zhi, Alonso Vaquero, Pedro, Liu, Cong, Huang, Yiqi, Liu, Zhenjie

“…Abstract Based on a large group/cluster catalog recently constructed from the DESI Legacy Imaging Surveys DR9 using an extended halo-based group finder, we…”
Get full text

DESI Legacy Imaging Surveys Data Release 9: Cosmological constraints from galaxy clustering and weak lensing using the minimal bias model by Xu, Haojie, Li, Hekun, Zhang, Jun, Yang, Xiaohu, Zhang, Pengjie, He, Min, Gu, Yizhou, Qin, Jian, Li, Zhaozhou, Katsianis, Antonios, Yao, Ji, Wang, Zhaoyu, Wang, Yirong, Fu, Liping

“…We present a tentative constraint on cosmological parameters Ω m and σ 8 from a joint analysis of galaxy clustering and galaxy-galaxy lensing from DESI Legacy…”
Get full text

Halo Properties and Mass Functions of Groups/Clusters from the DESI Legacy Imaging Surveys DR9 by Wang, Jiaqi, Yang, Xiaohu, Zhang, Jun, Li, Hekun, Fong, Matthew, Xu, Haojie, He, Min, Gu, Yizhou, Luo, Wentao, Dong, Fuyu, Wang, Yirong, Li, Qingyang, Katsianis, Antonios, Wang, Haoran, Shen, Zhi, Alonso Vaquero, Pedro, Liu, Cong, Huang, Yiqi, Liu, Zhenjie

“…Based on a large group/cluster catalog recently constructed from the DESI Legacy Imaging Surveys DR9 using an extended halo-based group finder, we measure and…”
Get full text

Mitigating the Noise-Source Coupling Effect in Shear Measurement by Li, HeKun, Zhang, Jun

“…Sub-percent level accuracy in shear measurement is required by the Stage-IV weak lensing surveys. One important challenge is about suppressing the shear bias…”
Get full text

Ellipticities of Galaxy Cluster Halos from Halo-Shear-Shear Correlations by Liu, Zhenjie, Zhang, Jun, Liu, Cong, Li, Hekun

“…We report the first detection of the halo ellipticities of galaxy clusters by applying the halo-shear-shear correlations (HSSC), without the necessity of major…”
Get full text

Quasi-2D Weak Lensing Cosmological Constraints Using the PDF-SYM method by Liu, Zhenjie, Zhang, Jun, Li, Hekun, Shen, Zhi, Liu, Cong

“…SCIENCE CHINA Physics, Mechanics & Astronomy , Volume 67, Issue 7: 270413 (2024) Cosmic shear statistics, such as the two-point correlation function (2PCF),…”
Get full text

Towards Optimal Reconstruction of Shear Field with PDF-Folding by Wang, Haoran, Zhang, Jun, Li, Hekun, Liu, Cong

“…Weak lensing provides a direct way of mapping the density distribution in the universe. To reconstruct the density field from the shear catalog, an important…”
Get full text