Shape, Color and Distance in Weak Gravitational Flexion
arXiv:2006.03506 · doi:10.1093/mnras/staa3928
Abstract
Canonically, elliptical galaxies might be expected to have a perfect rotational symmetry, making them ideal targets for flexion studies - however, this assumption hasn't been tested. We have undertaken an analysis of low and high redshift galaxy catalogs of known morphological type with a new gravitational lensing code, Lenser. Using color measurements in the u-r band and fit Sersic index values, objects with characteristics consistent with early-type galaxies are found to have a lower intrinsic scatter in flexion signal than late-type galaxies. We find this measured flexion noise can be reduced by more than a factor of two at both low and high redshift.
arXiv comment7 pages, 13 figures, submitted to MNRAS
References in corpus (14)
- Weak Gravitational Lensing
- CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products and Mosaics
- Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data
- A concise reference to (projected) Sersic R^{1/n} quantities, including Concentration, Profile Slopes, Petrosian indices, and Kron Magnitudes
- The EFIGI catalogue of 4458 nearby galaxies with detailed morphology
- The zCOSMOS Redshift Survey: the role of environment and stellar mass in shaping the rise of the morphology-density relation from z~1
- Weak Gravitational Flexion
- Galaxy-Galaxy Flexion: Weak Lensing to Second Order
- Weak gravitational shear and flexion with polar shapelets
- A Method for Weak Lensing Flexion Analysis by the HOLICs Moment Approach
- Measuring Flexion
- Measuring Gravitational Lensing Flexions in Abell 1689 Using an Analytic Image Model
- Shape, shear & flexion: An analytic flexion formalism for realistic mass profiles
- Estimate of dark halo ellipticity by lensing flexion