96 citations · 353 across the 25 of their papers we have counts for
26 papers
Synergy between the gravitational potential decay rate and other structure growth probes in testing gravity
Shang Li, Pengjie Zhang, Fuyu Dong
We test gravity by exploiting the synergy between the gravitational potential decay rate () and complementary structure-growth probes: these observables respond to MG…
Closing the Observational Gap in Cosmic Dynamics: AI-Enabled Reconstruction of the Universe's Vorticity and Rotational Flow Morphology
Ziyong Wu, Xu Xiao, Fuyu Dong +7
The cosmic vorticity field, an essential tracer of nonlinear structure formation, has remained observationally inaccessible because transverse galaxy motions are difficult to measu…
Constraining gravity with the decay rate of cosmological gravitational potential
Xinyi Zhao, Pengjie Zhang, Fuyu Dong
A key task in cosmology is to test the validity of general relativity (GR) at cosmological scales and, therefore, to distinguish between dark energy and modified gravity (MG) as th…
The Most Probable Behaviour of the Dark Energy Equation of State Indicates a Thawing Quintessence Field: Tomographic Alcock-Paczyński Test with Redshift-Space Correlation Function II
Fuyu Dong, Changbom Park
We apply an extended Alcock-Paczyński (AP) test to the Sloan Digital Sky Survey data to constrain the dark energy models with the Chevallier-Polarski-Linder (CPL) parametrization o…
Constraining with Lensing Statistics in Low and High Density Regions
Yiqi Huang, Fuyu Dong, Jun Zhang +2
Lensing studies are typically carried out around high density regions, such as groups and clusters, where the lensing signals are significant and indicative of rich density structu…
Self-similar decomposition of the hierarchical merger tree of dark matter halos
Wenkang Jiang, Jiaxin Han, Fuyu Dong +1
In the CDM universe, structure formation is generally not a self-similar process, while some self-similarity remains in certain statistics which can greatly simplify our descrip…
The direct measurement of gravitational potential decay rate at cosmological scales II -- Improved dark energy constraint from
Fuyu Dong, Pengjie Zhang, Haojie Xu +1
The gravitational potential decay rate (DR) is caused by the cosmic acceleration of the universe, providing a direct probe into the existence of dark energy (DE). We present measur…
Tomographic Alcock-Paczynski Test with Redshift-Space Correlation Function: Evidence for the Dark Energy Equation of State Parameter w>-1
Fuyu Dong, Changbom Park, Sungwook E. Hong +4
The apparent shape of galaxy clustering depends on the adopted cosmology used to convert observed redshift to comoving distance, the relation, as it changes the line element…
An unbiased method of measuring the ratio of two data sets
Zeyang Sun, Pengjie Zhang, Fuyu Dong +5
In certain cases of astronomical data analysis, the meaningful physical quantity to extract is the ratio between two data sets. Examples include the lensing ratio, the interlop…
Halo Properties and Mass Functions of Groups/Clusters from the DESI Legacy Imaging Surveys DR9
Jiaqi Wang, Xiaohu Yang, Jun Zhang +16
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-galax…
Shear Measurement with Poorly Resolved Images
Jun Zhang, Cong Liu, Pedro Alonso Vaquero +4
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…
The first direct measurement of gravitational potential decay rate at cosmological scales and improved dark energy constraint
Fuyu Dong, Pengjie Zhang, Zeyang Sun +1
The integrated Sachs-Wolfe (ISW) effect probes the decay rate () of large scale gravitational potential and therefore provides unique constraint on dark energy (DE). However it…
The Universal Specific Merger Rate of Dark Matter Halos
Fuyu Dong, Donghai Zhao, Jiaxin Han +3
We employ a set of high resolution N-body simulations to study the merger rate of dark matter halos. We define a specific merger rate by normalizing the average number of mergers p…
Cross-correlation of Planck CMB lensing with DESI galaxy groups
Zeyang Sun, Ji Yao, Fuyu Dong +3
We measure the cross-correlation between galaxy groups constructed from DESI Legacy Imaging Survey DR8 and \emph{Planck} CMB lensing, over overlapping sky area of 16876 …
Detection of cross-correlation between CMB Lensing and low-density points
Fuyu Dong, Pengjie Zhang, Le Zhang +4
Low Density Points (LDPs, \citet{2019ApJ...874....7D}), obtained by removing high-density regions of observed galaxies, can trace the Large-Scale Structures (LSSs) of the universe.…
The clustering of galaxies in the DESI imaging legacy surveys DR8: I. the luminosity and color dependent intrinsic clustering
Zhaoyu Wang, Haojie Xu, Xiaohu Yang +5
In a recent study, we developed a method to model the impact of photometric redshift uncertainty on the two-point correlation function (2PCF). In this method, we can obtain both th…
An Extended Halo-based Group/Cluster finder: application to the DESI legacy imaging surveys DR8
Xiaohu Yang, Haojie Xu, Min He +20
We extend the halo-based group finder developed by \citet[][]{Yang2005a} to use data {\it simultaneously} with either photometric or spectroscopic redshifts. A mock galaxy redshift…
Measuring the integrated Sachs-Wolfe effect from the low-density regions of the universe
Fuyu Dong, Yu Yu, Jun Zhang +2
The integrated Sachs-Wolfe (ISW) effect is caused by the decay of cosmological gravitational potential, and is therefore a unique probe of dark energy. However, its robust detectio…
Towards a Bias-Free Selection Function in Shear Measurement
Hekun Li, Jun Zhang, Dezi Liu +5
Sample selection is a necessary preparation for weak lensing measurement. It is well-known that selection itself may introduce bias in the measured shear signal. Using image simula…
Towards a Model-Independent Measurement of the Halo Mass Function with Observables
Fuyu Dong, Jun Zhang, Xiaohu Yang +2
In the CDM paradigm, the halo mass function is a sensitive probe of the cosmic structure. In observations, halo mass is typically estimated from its relation with other observables…
Constraining Dark Energy With Stacked Concave Lenses
Fuyu Dong, Jun Zhang, Yu Yu +6
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 possible explanation…
Testing Shear Recovery with Field Distortion
Jun Zhang, Fuyu Dong, Hekun Li +7
The tilt, rotation, or offset of each CCD with respect to the focal plane, as well as the distortion of the focal plane itself, cause shape distortions to the observed objects, an…
Analysis of the 3C445 Soft X-ray Spectrum as Observed by Chandra high-energy gratings
F. T. Dong, S. H. Shao, Y. Cheng +1
We present a detailed analysis of the soft X-ray emission of 3C445 using an archival Chandra HETG spectrum. Highly-ionized H- and He-like Mg, Si and S lines, as well as a resolved…
Removing the Impact of Correlated PSF Uncertainties in Weak Lensing
Tianhuan Lu, Jun Zhang, Fuyu Dong +5
Accurate reconstruction of the spatial distributions of the Point Spread Function (PSF) is crucial for high precision cosmic shear measurements. Nevertheless, current methods are n…