Weak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements

Abstract

With a primary goal of conducting precision weak lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by the Hubble Space Telescope (HST) to date using the Advanced Camera for Surveys (ACS). This is the first paper in a series where we describe our strategy for addressing the various technical challenges in the production of weak lensing measurements from the COSMOS data. The COSMOS ACS catalog is constructed from 575 ACS/WFC tiles (1.64 deg^2) and contains a total 1.2x10^6 objects to a limiting magnitude of F814W=26.5. This catalog is made publicly available. The shapes of galaxies have been measured and corrected for the distortion induced by the time varying ACS Point Spread Function and for Charge Transfer Efficiency effects. Next, simulated images are used to derive the shear susceptibility factors that are necessary in order to transform shape measurements into unbiased shear estimators. Finally, for each galaxy, we derive a shape measurement error and utilize this quantity to extract the intrinsic shape noise of the galaxy sample. Interestingly, our results indicate that the intrinsic shape noise varies little with either size, magnitude or redshift. Representing a number density of 66 galaxies per arcmin^2, the final COSMOS weak lensing catalog contains 3.9x10^5 galaxies with accurate shape measurements. The properties of the COSMOS weak lensing catalog described throughout this paper will provide key input numbers for the preparation and design of next-generation wide field space missions.

Accepted by ApJ, 28 pages, 18 figures

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• Dark Energy Survey Year 3 Results: Deep Field Optical + Near-Infrared Images and Catalogue
• How Future Space-Based Weak Lensing Surveys Might Obtain Photometric Redshifts Independently
• FPFS Shear Estimator: Systematic Tests on the Hyper Suprime-Cam Survey First Year Data
• Deep CFHT Y-band imaging of VVDS-F22 field: I. data products and photometric redshifts
• Euclid preparation. LXVII. Deep learning true galaxy morphologies for weak lensing shear bias calibration
• Probing the shape and internal structure of dark matter halos with the halo-shear-shear three-point correlation function
• Star-Galaxy Separation via Gaussian Processes with Model Reduction
• Mapping dark matter and finding filaments: calibration of lensing analysis techniques on simulated data
• Dark Energy Survey Year 1 Results: Photometric Data Set for Cosmology
• A Morphological Model to Separate Resolved-Unresolved Sources in the DESI Legacy Surveys: Application in the LS4 Alert Stream
• Nearby dwarf galaxies with extreme star formation rates: a window into dwarf-galaxy evolution in the early Universe
• AMICO-WL: an optimal filtering algorithm for galaxy cluster detections with weak lensing
• Exotic Image Formation in Strong Gravitational Lensing by Clusters of Galaxies -- III: Statistics with HUDF
• Disclosing Submillimeter Galaxy Formation: Mergers or Secular Evolution?
• Chasing the peak: optimal statistics for weak shear analyses
• Dark matter halos of luminous AGNs from galaxy-galaxy lensing with the HSC Subaru Strategic Program
• AMICO galaxy clusters in KiDS-DR3: the impact of estimator statistics on the luminosity-mass scaling relation
• Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias
• Photometric Selection of a Massive Galaxy Catalog with $z\ge 0.55$
• Impact of Point Spread Function Higher Moments Error on Weak Gravitational Lensing
• A multiwavelength study of an early galaxy group merger in COSMOS revealed by two tailed radio galaxies at z = 0.35
• The Evolution of the SFR-M_* relation at 0.1<z<4: Environmental and Morphological Dependencies
• Multi-scale weak lensing detection of galaxy clusters with source redshift tomography