Huanyuan Shan
A5050687158- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Black Holes and Theoretical Physics
- Solar and Space Plasma Dynamics
- Advanced Image Processing Techniques
- CCD and CMOS Imaging Sensors
- Superconducting and THz Device Technology
- Pulsars and Gravitational Waves Research
- Advanced Vision and Imaging
- Relativity and Gravitational Theory
- Statistical and numerical algorithms
- Antenna Design and Optimization
- Computational Physics and Python Applications
- Gaussian Processes and Bayesian Inference
Shanghai Astronomical Observatory
2019-2024
University of Chinese Academy of Sciences
2009-2024
Chinese Academy of Sciences
2006-2024
National Astronomical Observatories
2006-2023
Zhejiang University
2023
University of Hull
2023
École Polytechnique Fédérale de Lausanne
2013-2019
University of Bonn
2017-2019
Tsinghua University
2012-2013
Centre National de la Recherche Scientifique
2012
We present a joint cosmological analysis of weak gravitational lensing observations from the Kilo-Degree Survey (KiDS-1000), with redshift-space galaxy clustering Baryon Oscillation Spectroscopic (BOSS), and galaxy-galaxy overlap between KiDS-1000, BOSS spectroscopic 2-degree Field Lensing (2dFLenS). This combination large-scale structure probes breaks degeneracies parameters for individual observables, resulting in constraint on growth parameter $S_8=\sigma_8 \sqrt{\Omega_{\rm m}/0.3} =...
Context . The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at VLT Telescope, specifically designed for measuring weak gravitational lensing by galaxies and large-scale structure. When completed it will consist of 1350 square degrees imaged in four filters ( ugri ). Aims Here we present fourth public data release which more than doubles area sky covered 3. We also include aperture-matched Z Y J H K s photometry from our partner VIKING on...
We present high signal-to-noise galaxy–galaxy lensing measurements of the Baryon Oscillation Spectroscopic Survey constant mass (CMASS) sample using 250 deg2 weak-lensing data from Canada–France–Hawaii Telescope Lensing and Stripe 82 Survey. compare this signal with predictions mock catalogues trained to match observables including stellar function projected two-dimensional clustering CMASS. show that CMASS, together standard models galaxy–halo connection, robustly predicts a is 20–40 per...
We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, in a sequence of challenges for testing methods inferring weak gravitational lensing shear distortions simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included space- ground-based data with constant or cosmologically varying fields. The simplest (control) experiment parametric galaxies realistic distribution signal-to-noise, size, ellipticity,...
We present weak lensing shear catalogues from the fourth data release of Kilo-Degree Survey, KiDS-1000, spanning 1006 square degrees deep and high-resolution imaging. Our `gold-sample' galaxies, with well-calibrated photometric redshift distributions, consists 21 million galaxies an effective number density $6.17$ per arcminute. quantify accuracy spatial, temporal, flux-dependent point-spread function (PSF) model, verifying that model meets our requirements to induce less than a $0.1\sigma$...
We present a joint optical/X-ray analysis of the massive galaxy cluster Abell 2744 (z=0.308). Our strong- and weak-lensing within central region cluster, i.e., at R<1Mpc from brightest galaxy, reveals eight substructures, including main core. All these dark-matter halos are detected with significance least 5sigma feature masses ranging 0.5 to 1.4x10^{14}Msun R<150kpc. Merten et al. (2011) Medezinski (2016) substructures also by us. measure slightly higher mass for core component than...
We present the methodology for a joint cosmological analysis of weak gravitational lensing from fourth data release ESO Kilo-Degree Survey (KiDS-1000) and galaxy clustering partially overlapping Baryon Oscillation Spectroscopic (BOSS) 2-degree Field Lensing (2dFLenS). Cross-correlations between BOSS 2dFLenS positions source ellipticities have been incorporated into analysis, necessitating development hybrid model non-linear scales that blends perturbative non-perturbative approaches, an...
We present cosmological constraints from a cosmic shear analysis of the fourth data release Kilo-Degree Survey (KiDS-1000), doubling survey area with nine-band optical and near-infrared photometry respect to previous KiDS analyses. Adopting spatially flat $\Lambda$CDM model, we find $S_8 = \sigma_8 (\Omega_{\rm m}/0.3)^{0.5} 0.759^{+0.024}_{-0.021}$ for our fiducial analysis, which is in $3\sigma$ tension prediction Planck Legacy microwave background. compare COSEBIs (Complete Orthogonal...
We study the statistics of peaks in a weak lensing reconstructed mass map first 450 square degrees Kilo Degree Survey. The is computed with aperture masses directly applied to shear field an NFW-like compensated filter. compare peak observations that simulations for various cosmologies constrain cosmological parameter $S_8 = \sigma_8 \sqrt{\Omega_{\rm m}/0.3}$, which probes ($\Omega_{\rm m}, \sigma_8$) plane perpendicularly its main degeneracy. estimate $S_8=0.750\pm0.059$, using...
This paper is the first of a series papers constraining cosmological parameters with weak lensing peak statistics using $\sim 450~\rm deg^2$ imaging data from Kilo Degree Survey (KiDS-450). We measure high signal-to-noise ratio (SNR: $\nu$) convergence peaks in range $3<\nu<5$, and employ theoretical models to derive expected values. These are validated suite simulations. take into account two major systematic effects, boost factor effect baryons on mass-concentration relation dark matter...
We present a new sample of galaxy-scale strong gravitational-lens candidates, selected from 904 square degrees Data Release 4 the Kilo-Degree Survey (KiDS), i.e., "Lenses in Survey" (LinKS) sample. apply two Convolutional Neural Networks (ConvNets) to $\sim88\,000$ colour-magnitude luminous red galaxies yielding list 3500 strong-lens candidates. This is further down-selected via human inspection. The resulting LinKS composed 1983 rank-ordered targets classified as "potential lens candidates"...
The Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) is a 101 orbit + parallel Cycle 25 Hubble Space Telescope Treasury program taking data from 2018-2020. BUFFALO will expand existing coverage of the (HFF) in WFC3/IR F105W, F125W, F160W ACS/WFC F606W F814W around each six HFF clusters flanking fields. This additional area has not been observed by HST but already covered deep multi-wavelength datasets, including Spitzer Chandra. As with original program, designed to take...
We present measurements of the radial gravitational acceleration around isolated galaxies, comparing expected given baryonic matter with observed acceleration, using weak lensing from fourth data release Kilo-Degree Survey. These extend relation (RAR) by 2 decades into low-acceleration regime beyond outskirts observable galaxy. compare our RAR to predictions two modified gravity (MG) theories: MOND and Verlinde's emergent gravity. find that measured agrees well MG predictions. In addition,...
We conduct a pseudo- C ℓ analysis of the tomographic cross-correlation between 1000 deg 2 weak-lensing data from Kilo-Degree Survey (KiDS-1000) and thermal Sunyaev–Zeldovich (tSZ) effect measured by Planck Atacama Cosmology Telescope (ACT). Using HM X , halo-model-based approach that consistently models gas, star, dark matter components, we are able to derive constraints on both cosmology baryon feedback for first time these data, marginalising over redshift uncertainties, intrinsic...
We construct cosmic void catalogues with the DIVE finder upon SDSS BOSS DR12 and eBOSS DR16 galaxy samples BAO reconstruction applied, perform a joint analysis using different types of galaxies corresponding voids. The peak is evident for galaxy-galaxy, galaxy-void, void-void correlation functions all datasets, including ones cross correlating luminous red emission line samples. Two multi-tracer fitting schemes are then tested, one combining weight applied to voids, other single dilation...
We present a cosmic shear analysis with an improved redshift calibration for the fourth data release of Kilo-Degree Survey (KiDS-1000) using self-organising maps (SOMs). Compared to previous KiDS-1000 data, we expand sample more than twice its size, now consisting 17 spectroscopic campaigns, and significantly extending fraction KiDS galaxies are able calibrate our SOM methodology. then enhance precision photometric redshifts from COSMOS2015 Physics Accelerated Universe (PAUS), allowing us...
Abstract We present the application of image coaddition algorithm, upsampling and point-spread function (PSF) deconvolution (UPDC), for stacking multiple exposure images captured by James Webb Space Telescope (JWST) Near-Infrared Camera. By addressing PSF effect, UPDC provides visually enhanced sharper images. Furthermore, antialiasing superresolution capabilities make it easier to deblend sources overlapped on images, yielding a higher accuracy aperture photometry. apply this algorithm...
We develop a new method to predict the density associated with weak-lensing maps of (un)relaxed clusters in range theories interpolating between general relativity (GR) and modified Newtonian dynamics (MOND). apply it fit lensing map Bullet merging cluster 1E 0657-56, order constrain more robustly nature amount collisionless matter beyond usual assumption spherical equilibrium (Pointecouteau & Silk) validity GR on scales (Clowe et al.). Strengthening proposal previous authors, we show that...
We derived constraints on cosmological parameters using weak lensing peak statistics measured the $\sim130~{\rm deg}^2$ of Canada-France-Hawaii Telescope Stripe 82 Survey (CS82). This analysis demonstrates feasibility in studies. For our measurements, we considered peaks with signal-to-noise ratio range $\nu=[3,6]$. a flat $\Lambda$CDM model only $(\Omega_{\rm m}, \sigma_8)$ as free parameters, constrained following relation $\Sigma_8=\sigma_8(\Omega_{\rm m}/0.27)^{\alpha}$ to be:...
We measure the cross-correlation of cosmic microwave background lensing convergence maps derived from Atacama Cosmology Telescope data with galaxy as measured by Canada-France-Hawaii Stripe 82 Survey. The CMB-galaxy cross power spectrum is for first time a significance 4.2{\sigma}, which corresponds to 12% constraint on amplitude density fluctuations at redshifts ~ 0.9. With upcoming improved data, this novel type measurement will become powerful cosmological probe, providing precise mass...
Our current understanding of the Universe is established through pristine measurements structure in cosmic microwave background (CMB) and distribution shapes galaxies tracing large scale (LSS) Universe. One key ingredient that underlies cosmological observables field sources observed assumed to be initially Gaussian with high precision. Nevertheless, a minimal deviation from Gaussianityis perhaps most robust theoretical prediction models explain Universe; itis necessarily present even...
We present a tomographic weak lensing analysis of the Kilo Degree Survey Data Release 4 (KiDS-1000), using new pseudo angular power spectrum estimator (pseudo- C ℓ ) under development for ESA Euclid mission. Over 21 million galaxies with shape information are divided into five redshift bins, ranging from 0.1 to 1.2 in photometric redshift. measured pseudo- eight bands multipole range 76 < 1500 auto- and cross-power spectra between bins. A series tests were carried out check systematic...
We present refined cosmological parameter constraints derived from a cosmic shear analysis of the fourth data release Kilo-Degree Survey (KiDS-1000). Our main improvements include enhanced galaxy shape measurements made possible by an updated version lens fit code and improved calibration achieved with newly developed suite multi-band image simulations. Additionally, we incorporated recent advancements in inference joint Dark Energy Year 3 KiDS-1000 analysis. Assuming spatially flat standard...
Mass calibration uncertainty is the largest systematic effect for using clusters of galaxies to constrain cosmological parameters. We present weak lensing mass measurements from Canada-France-Hawaii Telescope Stripe 82 Survey galaxy selected through their high signal-to-noise thermal Sunyaev-Zeldovich (tSZ) signal measured with Atacama Cosmology (ACT). For a sample 9 ACT tSZ greater than five average $\left(4.8\pm0.8\right)\,\times10^{14}\,\mathrm{M}_\odot$, consistent estimate...