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Cosmic voids and void lensing in the Dark Energy Survey science verification data

Research output: Contribution to journalArticlepeer-review

  • C. Sánchez
  • J. Clampitt
  • A. Kovacs
  • B. Jain
  • J. García-Bellido
  • S. Nadathur
  • D. Gruen
  • N. Hamaus
  • D. Huterer
  • P. Vielzeuf
  • C. Bonnett
  • J. DeRose
  • W. G. Hartley
  • M. Jarvis
  • O. Lahav
  • R. Miquel
  • E. Rozo
  • E. S. Rykoff
  • E. Sheldon
  • R. H. Wechsler
  • J. Zuntz
  • T. M. C. Abbott
  • F. B. Abdalla
  • J. Annis
  • A. Benoit-Lévy
  • G. M. Bernstein
  • R. A. Bernstein
  • E. Bertin
  • D. Brooks
  • E. Buckley-Geer
  • A. Carnero Rosell
  • M. Carrasco Kind
  • J. Carretero
  • M. Crocce
  • C. E. Cunha
  • C. B. D'Andrea
  • L. N. da Costa
  • S. Desai
  • H. T. Diehl
  • J. P. Dietrich
  • P. Doel
  • A. E. Evrard
  • A. Fausti Neto
  • B. Flaugher
  • P. Fosalba
  • J. Frieman
  • E. Gaztanaga
  • R. A. Gruendl
  • G. Gutierrez
  • K. Honscheid
  • D. J. James
  • E. Krause
  • K. Kuehn
  • M. Lima
  • M. A. G. Maia
  • J. L. Marshall
  • P. Melchior
  • A. A. Plazas
  • K. Reil
  • A. K. Romer
  • E. Sanchez
  • M. Schubnell
  • I. Sevilla-Noarbe
  • R. C. Smith
  • M. Soares-Santos
  • F. Sobreira
  • E. Suchyta
  • G. Tarle
  • J. Weller
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 that 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 catalogs is within 20% for all transverse void sizes, and indistinguishable for the largest voids (Rv ≥ 70Mpc/h). 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, and carry out a stacked weak lensing measurement. With a significance of 4.4σ, the lensing measurement confirms 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.
Original languageEnglish
Pages (from-to)746-759
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date26 Oct 2016
Publication statusPublished - 11 Feb 2017


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    Rights statement: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The final published version of this article is available online at: DOI: 10.1093/mnras/stw2745.

    Accepted author manuscript (Post-print), 2.21 MB, PDF document

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