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The effective number density of galaxies for weak lensing measurements in the LSST project
Open accessAbstract
Future weak lensing surveys potentially hold the highest statistical power for constraining cosmological parameters compared to other cosmological probes. The statistical power of a weak lensing survey is determined by the sky coverage, the inverse of the noise in shear measurements and the galaxy number density. The combination of the latter two factors is often expressed in terms of neff – the ‘effective number density of galaxies used for weak lensing measurements’. In this work, we estimate neff for the Large Synoptic Survey Telescope (LSST) project, the most powerful ground-based lensing survey planned for the next two decades. We investigate how the following factors affect the resulting neff of the survey with detailed simulations: (1) survey time, (2) shear measurement algorithm, (3) algorithm for combining multiple exposures, (4) inclusion of data from multiple filter bands, (5) redshift distribution of the galaxies and (6) masking and blending. For the first time, we quantify in a general weak lensing analysis pipeline the sensitivity of neff to the above factors. We find that with current weak lensing algorithms, expected distributions of observing parameters, and all lensing data (r and i band, covering 18 000 degree2 of sky) for LSST, neff ≈ 37 arcmin−2 before considering blending and masking, neff ≈ 31 arcmin−2 when rejecting seriously blended galaxies and neff ≈ 26 arcmin−2 when considering an additional 15 per cent loss of galaxies due to masking. With future improvements in weak lensing algorithms, these values could be expected to increase by up to 20 per cent. Throughout the paper, we also stress the ways in which neff depends on our ability to understand and control systematic effects in the measurements.
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Self-citation
Metadata
- Authors
- Chang, C., Jarvis, M., Jain, B., Kahn, S. M., Kirkby, D., Connolly, A., Krughoff, S., Peng, E. H., & Peterson, J. R.
- Affiliations
- Kavli Institute for Particle Astrophysics and Cosmology (US)
- University of Pennsylvania (US)
- University of California, Irvine (US)
- University of Washington (US)
- Purdue University West Lafayette (US)
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2013-07-19
- Volume
- 434
- Issue
- 3
- Pages
- 2121-2135
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W2023217969
- Cited by
- 164
- References
- 49
- Citations by year
- 2026: 11 · 2025: 14 · 2024: 13 · 2023: 10 · 2022: 13 · 2021: 11 · 2020: 12 · 2019: 16 · 2018: 22 · 2017: 8 · 2016: 15 · 2015: 14 · 2014: 5
- FWCI
- 6.12
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Monthly Notices of the Royal Astronomical Society (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (DE-SC0007901, 0809409)
- U.S. Department of Energy (DE-AC02-76-SFO0515, DESC0007901, DE-AC02-)
- SLAC National Accelerator Laboratory
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Keywords
- weak gravitational lensing, LSST, shear measurement, galaxy blending, redshift distribution, multi-band imaging, cosmological parameter constraints, statistical power, systematic effects
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