Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Li, Hekun"'
The existing large scale weak lensing surveys typically reserve the best seeing conditions for a certain optical band to minimize shape measurement errors and maximize the number of usable background galaxies. This is because most popular shear measu
Externí odkaz:
http://arxiv.org/abs/2407.00370
Tele-correlation refers to the correlation of galaxy shapes with large angular separations (e.g., $>100$ degrees). Since there are no astrophysical reasons causing such a correlation on cosmological scales, any detected tele-correlation could disclos
Externí odkaz:
http://arxiv.org/abs/2406.17991
Publikováno v:
SCIENCE CHINA Physics, Mechanics & Astronomy , Volume 67, Issue 7: 270413 (2024)
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 approach. It makes use of the full PDF information of the shear estimators, and does not requ
Externí odkaz:
http://arxiv.org/abs/2310.11209
Autor:
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
Publikováno v:
SCIENCE CHINA Physics, Mechanics & Astronomy, Volume 66, Issue 12: 129811 (2023)
We present a tentative constraint on cosmological parameters $\Omega_m$ and $\sigma_8$ from a joint analysis of galaxy clustering and galaxy-galaxy lensing from DESI Legacy Imaging Surveys Data Release 9 (DR9), covering approximately 10000 square deg
Externí odkaz:
http://arxiv.org/abs/2310.03066
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 step is to build the shear field from the shear catalog, which can be quite nontrivial due t
Externí odkaz:
http://arxiv.org/abs/2303.08313
Cluster cosmology depends critically on how optical clusters are selected from imaging surveys. We compare the conditional luminosity function (CLF) and weak lensing halo masses between two different cluster samples at fixed richness, detected within
Externí odkaz:
http://arxiv.org/abs/2212.13270
Autor:
Alonso, Pedro, Wang, Wenting, Zhang, Jun, Li, Hekun, Shao, Shi, Guo, Qi, He, Yanqin, Hao, Cai-Na, Shi, Rui
Based on independent shear measurements using the DECaLS/DR8 imaging data, we measure the weak lensing signals around isolated central galaxies (ICGs) from SDSS/DR7 at $z\sim0.1$. The projected stellar mass density profiles of surrounding satellite g
Externí odkaz:
http://arxiv.org/abs/2212.04702
Autor:
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, Pedro, Liu, Cong, Huang, Yiqi, Liu, Zhenjie
Publikováno v:
ApJ 936 161 (2022)
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 model the group-galaxy weak lensing signals for groups/clusters in a few redshift bins with
Externí odkaz:
http://arxiv.org/abs/2207.12771
Weak lensing studies typically require excellent seeing conditions for the purpose of maximizing the number density of well-resolved galaxy images. It is interesting to ask to what extent the seeing size limits the usefulness of the astronomical imag
Externí odkaz:
http://arxiv.org/abs/2206.02434
Autor:
Shen, Zhi, Zhang, Jun, Li, Hekun, Wang, Haoran, Wei, Chengliang, Li, Guoliang, Li, Xiaobo, Ban, Zhang, Yue, Dan
Images taken by space telescopes typically have a superb spatial resolution, but a relatively poor sampling rate due to the finite CCD pixel size. Beyond the Nyquist limit, it becomes uncertain how much the pixelation effect may affect the accuracy o
Externí odkaz:
http://arxiv.org/abs/2206.01377