Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 465, Issue 1, Pages 746-759Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw2745
Keywords
gravitational lensing: weak; cosmology: observations; large-scale structure of Universe
Categories
Funding
- U.S. Department of Energy
- U.S. National Science Foundation
- Ministry of Science and Education of Spain
- Science and Technology Facilities Council of the United Kingdom
- Higher Education Funding Council for England
- National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign
- Kavli Institute of Cosmological Physics at the University of Chicago
- Center for Cosmology andAstro-Particle Physics at the Ohio State University
- Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University
- Financiadora de Estudos e Projetos
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Ministerio da Ciencia
- Tecnologia e Inovacao
- Deutsche Forschungsgemeinschaft
- Collaborating Institutions in the Dark Energy Survey
- National Science Foundation [AST-1138766]
- MINECO [AYA2012-39559, ESP2013-48274, FPA2013-47986]
- Centro de Excelencia Severo Ochoa [SEV-2012-0234]
- European Research Council under the European Union's Seventh Framework Programme (FP7)/including ERC grant [240672, 291329, 306478]
- NASA through the Einstein Fellowship Program [PF5-160138]
- STFC [ST/N000668/1, ST/I000976/1, ST/M003574/1, ST/H001581/1, ST/L000652/1, ST/P000525/1, ST/M001334/1, ST/L000768/1, ST/L006529/1, ST/N001087/1] Funding Source: UKRI
- ICREA Funding Source: Custom
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1536171, 1311924] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1125897] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/N000668/1, ST/L000768/1, ST/M001334/1] Funding Source: researchfish
- UK Space Agency [ST/N002679/1, ST/K003135/1] Funding Source: researchfish
Ask authors/readers for more resources
Cosmic voids are usually identified in spectroscopic galaxy surveys, where 3D information about the large-scale structure of the Universe is available. Although an increasing amount of photometric data is being produced, its potential for void studies is limited since photometric redshifts induce line-of-sight position errors of >= 50 Mpc h(-1)which can render many voids undetectable. We present a new void finder designed for photometric surveys, validate it using simulations, and apply it to the high-quality photo-z redMaGiC galaxy sample of the DES Science Verification data. The algorithm works by projecting galaxies into 2D slices and finding voids in the smoothed 2D galaxy density field of the slice. Fixing the line-of-sight size of the slices to be at least twice the photo-z scatter, the number of voids found in simulated spectroscopic and photometric galaxy catalogues is within 20 per cent for all transverse void sizes, and indistinguishable for the largest voids (R-v >= 70 Mpc h(-1)). The positions, radii, and projected galaxy profiles of photometric voids also accurately match the spectroscopic void sample. Applying the algorithm to the DES-SV data in the redshift range 0.2 < z < 0.8, we identify 87 voids with comoving radii spanning the range 18-120 Mpc h(-1), and carry out a stacked weak lensing measurement. With a significance of 4.4 sigma, the lensing measurement confirms that the voids are truly underdense in the matter field and hence not a product of Poisson noise, tracer density effects or systematics in the data. It also demonstrates, for the first time in real data, the viability of void lensing studies in photometric surveys.
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