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Title: Galaxy Clustering, Photometric Redshifts and Diagnosis of Systematics in the DES Science Verification Data

Journal Article · · Monthly Notices of the Royal Astronomical Society (Online)
 [1]
  1. Institut de Ciencies de l'Espai, Barcelona (Spain). et al.
+ Show Author Affiliations

We study the clustering of galaxies detected at i < 22.5 in the Science Verification observations of the Dark Energy Survey (DES). Two-point correlation functions are measured using 2.3 × 106 galaxies over a contiguous 116 deg2 region in five bins of photometric redshift width Δz = 0.2 in the range 0.2 < z < 1.2. The impact of photometric redshift errors is assessed by comparing results using a template-based photo-zalgorithm (BPZ) to a machine-learning algorithm (TPZ). A companion paper presents maps of several observational variables (e.g. seeing, sky brightness) which could modulate the galaxy density. Here we characterize and mitigate systematic errors on the measured clustering which arise from these observational variables, in addition to others such as Galactic dust and stellar contamination. After correcting for systematic effects, we then measure galaxy bias over a broad range of linear scales relative to mass clustering predicted from the Planck Λ cold dark matter model, finding agreement with the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) measurements with χ2 of 4.0 (8.7) with 5 degrees of freedom for the TPZ (BPZ) redshifts. Furthermore, we test a ‘linear bias’ model, in which the galaxy clustering is a fixed multiple of the predicted non-linear dark matter clustering. The precision of the data allows us to determine that the linear bias model describes the observed galaxy clustering to 2.5 percent accuracy down to scales at least 4–10 times smaller than those on which linear theory is expected to be sufficient.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
DES Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1223231
Report Number(s):
FERMILAB-PUB-15-305; arXiv eprint number arXiv:1507.05360
Journal Information:
Monthly Notices of the Royal Astronomical Society (Online), Vol. 455, Issue 4; ISSN 1365-2966
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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The WiggleZ Dark Energy Survey: Survey Design and First Data Release text January 2009
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The Blanco Cosmology Survey: Data Acquisition, Processing, Calibration, Quality Diagnostics and Data Release text January 2012
The Baryon Oscillation Spectroscopic Survey of SDSS-III text January 2012
PreCam, a Precursor Observational Campaign for Calibration of the Dark Energy Survey text January 2012
Planck 2013 results. XVI. Cosmological parameters text January 2013
TPZ : Photometric redshift PDFs and ancillary information by using prediction trees and random forests text January 2013
Estimating the large-scale angular power spectrum in the presence of systematics: a case study of Sloan Digital Sky Survey quasars text January 2013
Photo-z Quality Cuts and their Effect on the Measured Galaxy Clustering text January 2013
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The MICE Grand Challenge Lightcone Simulation II: Halo and Galaxy catalogues text January 2013
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Cited By (40)

Reconstruction of interaction rate in holographic dark energy journal November 2016
CMB lensing tomography with the DES Science Verification galaxies journal January 2016
No galaxy left behind: accurate measurements with the faintest objects in the Dark Energy Survey journal January 2016
Joint measurement of lensing–galaxy correlations using SPT and DES SV data journal July 2016
Star–galaxy classification using deep convolutional neural networks journal October 2016
The Dark Energy Survey: more than dark energy – an overview journal March 2016
Large-scale retrospective relative spectrophotometric self-calibration in space journal February 2017
Dark Energy Survey Year 1 Results: calibration of redMaGiC redshift distributions in DES and SDSS from cross-correlations journal September 2018
Dark Energy Survey year 1 results: galaxy sample for BAO measurement journal September 2018
Measuring linear and non-linear galaxy bias using counts-in-cells in the Dark Energy Survey Science Verification data journal October 2018
Weak lensing magnification in the Dark Energy Survey Science Verification data journal February 2018
KiDS+GAMA: cosmology constraints from a joint analysis of cosmic shear, galaxy–galaxy lensing, and angular clustering journal March 2018
Dark Energy Survey Year 1 results: measurement of the galaxy angular power spectrum journal June 2019
The PAU Survey: early demonstration of photometric redshift performance in the COSMOS field journal January 2019
Producing a BOSS CMASS sample with DES imaging journal September 2019
A new sample of southern radio galaxies: host-galaxy masses and star-formation rates journal August 2019
Comparing galaxy clustering in Horizon-AGN simulated light-cone mocks and VIDEO observations journal October 2019
Optimizing galaxy samples for clustering measurements in photometric surveys journal November 2019
Dark sectors with dynamical coupling journal October 2019
Detecting black-hole binary clustering via the second-generation gravitational-wave detectors journal July 2016
Dark Energy Survey year 1 results: Galaxy-galaxy lensing journal August 2018
Interacting dark energy with time varying equation of state and the H 0 tension journal December 2018
Hierarchical Modeling and Statistical Calibration for Photometric Redshifts journal August 2019
Dark Energy Survey Year 1 Results: Calibration of redMaGiC redshift distributions in DES and SDSS from cross-correlations text January 2018
CMB lensing tomography with the DES Science Verification galaxies text January 2015
The Dark Energy Survey: more than dark energy - an overview text January 2016
Large-scale retrospective relative spectro-photometric self-calibration in space text January 2016
Reconstruction of interaction rate in Holographic dark energy text January 2016
KiDS+GAMA: Cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing and angular clustering text January 2017
Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing text January 2017
Dark Energy Survey Year 1 Results: Galaxy-Galaxy Lensing text January 2017
Density split statistics: Cosmological constraints from counts and lensing in cells in DES Y1 and SDSS data text January 2017
Hierarchical modeling and statistical calibration for photometric redshifts text January 2018
Measuring Linear and Non-linear Galaxy Bias Using Counts-in-Cells in the Dark Energy Survey Science Verification Data text January 2018
Producing a BOSS-CMASS sample with DES imaging text January 2019
Dark sectors with dynamical coupling text January 2019
A new estimator for gravitational lensing using galaxy and intensity mapping surveys text January 2019
Optimizing galaxy samples for clustering measurements in photometric surveys text January 2019
A new sample of southern radio galaxies: Host galaxy masses and star-formation rates text January 2019
Weak lensing deflection of three-point correlation functions text January 2017

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79 ASTRONOMY AND ASTROPHYSICS
surveys
cosmology: observations
large-scale structure of Universe