期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 501, 期 3, 页码 4103-4109出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3928
关键词
gravitational lensing: weak; galaxies: general
资金
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England for England
- Association of Universities for Research in Astronomy, Inc., under NASA [NAS5-26555]
The study found that objects with characteristics consistent with early-type galaxies have lower intrinsic scatter in flexion signal, while late-type galaxies have higher scatter. The measured flexion noise can be reduced by more than a factor of two at both low and high redshifts.
Canonically, elliptical galaxies might be expected to have a perfect rotational symmetry, making them ideal targets for flexion studies - however, this assumption has not been tested. We have undertaken an analysis of low- and high-redshift galaxy catalogues of known morphological type with a new gravitational lensing code, Lenser. Using colour measurements in the u - r bands 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.
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