A5103269171- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Ionosphere and magnetosphere dynamics
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Calibration and Measurement Techniques
- GNSS positioning and interference
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Metamaterials and Metasurfaces Applications
- Remote Sensing in Agriculture
- Atmospheric aerosols and clouds
- Astronomical Observations and Instrumentation
- Relativity and Gravitational Theory
- Infrared Target Detection Methodologies
- Photocathodes and Microchannel Plates
- Advanced Vision and Imaging
Shanghai Normal University
2015-2024
National Space Science Center
2009-2024
Chinese Academy of Sciences
1999-2024
Space Engineering University
2020-2024
Central South University
2024
Ludong University
2008-2012
Astronomical Observatory of Capodimonte
2009-2011
Centre National de la Recherche Scientifique
2006-2009
Sorbonne Université
2009
Institut d'Astrophysique de Paris
2006-2009
We present a finely-binned tomographic weak lensing analysis of the Canada-France-Hawaii Telescope Lensing Survey, CFHTLenS, mitigating contamination to signal from presence intrinsic galaxy alignments via simultaneous fit cosmological model and an alignment model. CFHTLenS spans 154 square degrees in five optical bands, with accurate shear photometric redshifts for sample median redshift zm =0.70. estimate 21 sets cosmic correlation functions associated six bins, each spanning angular range...
We present the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) that accurately determines a weak gravitational lensing signal from full 154 square degrees of deep multi-colour data obtained by CFHT Legacy Survey. Weak large-scale structure is widely recognised as one most powerful but technically challenging probes cosmology. outline CFHTLenS analysis pipeline, describing how and why every step chain raw pixel to shear photometric redshift measurement has been revised improved...
A likelihood-based method for measuring weak gravitational lensing shear in deep galaxy surveys is described and applied to the Canada–France–Hawaii Telescope (CFHT) Lensing Survey (CFHTLenS). CFHTLenS comprises 154 deg2 of multi-colour optical data from CFHT Legacy Survey, with measurements being made i′ band a depth i′AB < 24.7, galaxies signal-to-noise ratio νSN ≳ 10. The based on lensfit algorithm earlier papers, but here we describe full analysis pipeline that takes into account...
We present data products from the Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS). CFHTLenS is based on Wide component of Legacy (CFHTLS). It encompasses 154 deg2 deep, optical, high-quality, sub-arcsecond imaging in five optical filters u*g′r′i′z′. The scientific aims team are weak gravitational lensing studies supported by photometric redshift estimates for galaxies. This paper presents our processing complete set. were able to obtain a set with very good image quality and...
We present an exploration of weak lensing by large-scale structure in the linear regime, using third-year (T0003) CFHTLS Wide data release. Our results place tight constraints on scaling amplitude matter power spectrum sigma_8 with density Omega_m. Spanning 57 square degrees to i'_AB = 24.5 over three independent fields, unprecedented contiguous area this survey permits high signal-to-noise measurements two-point shear statistics from 1 arcmin 4 degrees. Understanding systematic errors our...
We present cosmological constraints from 2D weak gravitational lensing by the large-scale structure in Canada-France Hawaii Telescope Lensing Survey (CFHTLenS) which spans 154 square degrees five optical bands. Using accurate photometric redshifts and measured shapes for 4.2 million galaxies between of 0.2 1.3, we compute cosmic shear correlation function over angular scales ranging 0.8 350 arcmin. non-linear models dark-matter power spectrum, constrain parameters exploring parameter space...
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not.The documents may come from teaching institutions in France abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés.
We present the first measurements of weak gravitational lensing signal induced by large-scale mass distribution in universe from data obtained as part ongoing Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). The used this analysis are Wide Synoptic Survey, which aims to image ~170 deg2 five filters. have analyzed an effective area ~22 (31 pointings) i' spread over two three survey fields. These excellent quality, and results bode well for remainder survey: we do not detect a...
We present a study of the relation between dark matter halo mass and baryonic content host galaxies, quantified via luminosity stellar mass. Our investigation uses 154 deg2 Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) lensing photometric data, obtained from CFHT Legacy Survey. employ galaxy-galaxy model which allows us to constrain satellite fraction. analysis is limited lenses at redshifts 0.2 0.4. express relationship observable as power law. For luminosity-halo we find slope...
Dark energy may be the first sign of new fundamental physics in Universe, taking either a physical form or revealing correction to Einsteinian gravity. Weak gravitational lensing and galaxy peculiar velocities provide complementary probes General Relativity, combination allow us test modified theories gravity unique way. We perform such an analysis by combining measurements cosmic shear tomography from Canada-France Hawaii Telescope Lensing Survey (CFHTLenS) with growth structure WiggleZ...
Higher order, non-Gaussian aspects of the large-scale structure carry valuable information on formation and cosmology, which is complementary to second-order statistics. In this work, we measure second- third-order weak-lensing aperture-mass moments from Canada–France–Hawaii Lensing Survey (CFHTLenS) combine those with cosmic microwave background (CMB) anisotropy probes. The third moment measured a significance 2σ. combined constraint Σ8 = σ8(Ωm/0.27)α improved by 10 per cent, in comparison...
We present the first cosmic shear measurements obtained from T0001 release of Canada-France-Hawaii Telescope Legacy Survey. The data set covers three uncorrelated patches (D1, D3 and D4) one square degree each, observed in u*, g', r', i' z' bands, to a depth . deep, multi-colour observations these fields allow for several data-quality controls. lensing signal is detected both r' bands shows similar amplitude slope filters. B-modes are found be statistically zero at all scales. Using...
Galaxy-galaxy weak lensing is a direct probe of the mean matter distribution around galaxies. The depth and sky coverage CFHT Legacy Survey yield statistically significant galaxy halo mass measurements over much wider range stellar masses ($10^{8.75}$ to $10^{11.3} M_{\odot}$) redshifts ($0.2 < z 0.8$) than previous studies. At redshift $z \sim 0.5$, stellar-to-halo ratio (SHMR) reaches maximum $4.0\pm0.2$ percent as function at $\sim 10^{12.25} M_{\odot}$. We find, for first time from...
We present new constraints on the relationship between galaxies and their host dark matter haloes, measured from location of peak stellar-to-halo mass ratio (SHMR), up to most massive galaxy clusters at redshift z ∼ 0.8 over a volume nearly 0.1 Gpc3. use unique combination deep observations in CFHTLenS/VIPERS field near-UV near-IR, supplemented by ∼60 000 secure spectroscopic redshifts, analysing clustering, galaxy–galaxy lensing stellar function. interpret our measurements within halo...
We present a quantitative analysis of the largest contiguous maps projected mass density obtained from gravitational lensing shear. use data 154 deg2 covered by Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS). Our study is first attempt to quantitatively characterize scientific value maps, which could serve in future as complementary approach dark universe with lensing. show that contain unique cosmological information beyond traditional two-point statistical techniques.
The Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) comprises deep multi-colour (u*g'r'i'z') photometry spanning 154 square degrees, with accurate photometric redshifts and shape measurements. We demonstrate that the redshift probability distribution function summed over galaxies provides an representation of galaxy accounting for random catastrophic errors best fitting z_p < 1.3. present cosmological constraints using tomographic weak gravitational lensing by large-scale structure....
This paper presents the first application of 3D cosmic shear to a wide-field weak lensing survey. is technique that analyses in three dimensions using spherical harmonic approach, and does not bin data redshift direction. applied CFHTLenS, 154 square degree imaging survey with median 0.7 an effective number density 11 galaxies per arcminute usable for lensing. To account masks we apply pseudo-Cl approach on data, avoid uncertainties highly non-linear regime, separately analyse radial wave...
<i>Aims. <i/>We combine measurements of weak gravitational lensing from the CFHTLS-Wide survey, supernovae Ia CFHT SNLS and CMB anisotropies WMAP5 to obtain joint constraints on cosmological parameters, in particular, dark-energy equation-of-state parameter <i>w<i/>. We assess influence systematics data results look for possible correlations with parameters.<i>Methods. implemented an MCMC algorithm sample space a flat CDM model component constant Systematics are parametrised included...
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:...
In this Letter, we report the observational constraints on Hu-Sawicki f(R) theory derived from weak lensing peak abundances, which are closely related to mass function of massive halos. comparison with studies using optical or x-ray clusters galaxies, analyses have advantages not relying mass-baryonic observable calibrations. With observations Canada-France-Hawaii-Telescope Lensing Survey, our give rise a tight constraint model parameter |f_{R0}| for n=1. The 95% C.L. is...
We present weak lensing and X-ray analysis of 12 low-mass clusters from the Canada–France–Hawaii Telescope Lensing Survey XMM-CFHTLS surveys. combine these systems with high-mass Canadian Cluster Comparison Project Cosmic Evolution to obtain a sample 70 systems, spanning over two orders magnitude in mass. measure core-excised LX–TX, M–LX M–TX scaling relations include corrections for observational biases. By providing fully bias-corrected relations, we give current limitations LX TX as...
Jet origination is one of the most important questions AGN, yet it stays obscure. In this work, we made use information emission lines, spectral energy distributions (SEDs), \textit{Fermi}-LAT $\gamma$-ray emission, construct a blazar sample that contains 667 sources. We notice jet power originations are different for BL Lacs and FSRQs. The correlation between $P_{\rm jet}$ normalized disk luminosity $L_{\rm Disk}/L_{\rm Edd}$ shows slope -1.77 1.16 results seem to suggest Lac jets powered...