Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Lu, Tianhuan"'
Autor:
Lu, Tianhuan
In this dissertation, we investigate weak lensing cosmology and its astrophysical systematics by employing machine learning techniques. We focus on addressing the discrepancy between two previous weak lensing analyses on CFHTLenS data, understanding
We present cosmological constraints from the Subaru Hyper Suprime-Cam (HSC) first-year weak lensing shear catalogue using convolutional neural networks (CNNs) and conventional summary statistics. We crop 19 $3\times3\,\mathrm{{deg}^2}$ sub-fields fro
Externí odkaz:
http://arxiv.org/abs/2301.01354
Next-generation weak lensing (WL) surveys, such as by the Vera Rubin Observatory's LSST, the $\textit{Roman}$ Space Telescope, and the $\textit{Euclid}$ space mission, will supply vast amounts of data probing small, highly nonlinear scales. Extractin
Externí odkaz:
http://arxiv.org/abs/2201.08320
Ongoing and planned weak lensing (WL) surveys are becoming deep enough to contain information on angular scales down to a few arcmin. To fully extract information from these small scales, we must capture non-Gaussian features in the cosmological WL s
Externí odkaz:
http://arxiv.org/abs/2109.11060
Publikováno v:
Phys. Rev. D 105, 023505 (2022)
In order to extract full cosmological information from next-generation large and high-precision weak lensing (WL) surveys (e.g. Euclid, Roman, LSST), higher-order statistics that probe the small-scale, non-linear regime of large scale structure (LSS)
Externí odkaz:
http://arxiv.org/abs/2109.00547
Autor:
Lu, Tianhuan, Haiman, Zoltán
As weak lensing surveys are becoming deeper and cover larger areas, information will be available on small angular scales down to the arcmin level. To extract this extra information, accurate modelling of baryonic effects is necessary. In this work,
Externí odkaz:
http://arxiv.org/abs/2104.04165
Autor:
Lu, Tianhuan, Haiman, Zoltán
Publikováno v:
Monthly Notices of the Royal Astronomical Society 490.4 (2019): 5033-5042
Based on the cosmic shear data from the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), Kilbinger et al. (2013) obtained a constraint on the amplitude of matter fluctuations of $\sigma_8({\Omega_\mathrm{m}}/0.27)^{0.6}=0.79\pm0.03$ from the
Externí odkaz:
http://arxiv.org/abs/1905.07803
Autor:
Lu, Tianhuan, Zhang, Jun, Dong, Fuyu, Li, Yingke, Liu, Dezi, Fu, Liping, Li, Guoliang, Fan, Zuhui
Publikováno v:
The Astrophysical Journal 858.2 (2018): 122
Accurate reconstruction of the spatial distributions of the Point Spread Function (PSF) is crucial for high precision cosmic shear measurements. Nevertheless, current methods are not good at recovering the PSF fluctuations of high spatial frequencies
Externí odkaz:
http://arxiv.org/abs/1712.09736
Autor:
Lu, Tianhuan, Luo, Wentao, Zhang, Jun, Zhang, Jiajun, Li, Hekun, Dong, Fuyu, Li, Yingke, Liu, Dezi, Fu, Liping, Li, Guoliang, Fan, Zuhui
Publikováno v:
The Astronomical Journal 156.1 (2018): 14
In this work, we present a novel centroiding method based on Fourier space Phase Fitting(FPF) for Point Spread Function(PSF) reconstruction. We generate two sets of simulations to test our method. The first set is generated by GalSim with elliptical
Externí odkaz:
http://arxiv.org/abs/1801.01015
Autor:
Luo, Wentao, Yang, Xiaohu, Lu, Tianhuan, Shi, Feng, Zhang, Jun, Mo, H. J., Shu, Chenggang, Fu, Liping, Radovich, Mario, Zhang, Jiajun, Li, Nan, Sunayama, Tomomi, Wang, Lei
As the second paper of a series on studying galaxy-galaxy lensing signals using the Sloan Digital Sky Survey Data Release 7 (SDSS DR7), we present our measurement and modelling of the lensing signals around groups of galaxies. We divide the groups in
Externí odkaz:
http://arxiv.org/abs/1712.09030