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Title: Correcting for fibre assignment incompleteness in the DESI Bright Galaxy Survey

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [2];  [3];  [3];  [2];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11]
  1. Univ. Paris-Saclay, Gif-sur-Yvette (France). Alternative Energies and Atomic Energy Commission (CEA); Univ. of Durham (United Kingdom). Inst. for Computational Cosmology
  2. Univ. of Durham (United Kingdom). Inst. for Computational Cosmology
  3. Univ. of Durham (United Kingdom). Inst. for Computational Cosmology; Univ. of Durham (United Kingdom). Centre for Extragalactic Astronomy
  4. Univ. of Portsmouth (United Kingdom). Inst. of Cosmology & Gravitation
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Univ. College London (United Kingdom). Dept. of Physics & Astronomy
  7. Univ. of Los Andes, Bogota (Columbia)
  8. Siena College, Loudonville, NY (United States)
  9. Univ. of Portsmouth (United Kingdom). Inst. of Cosmology & Gravitation; Univ. of Waterloo, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  10. Univ. of Michigan, Ann Arbor, MI (United States)
  11. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States). Dept. of Physics
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The Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Survey (BGS) will be a survey of bright, low-redshift galaxies, which is planned to cover an area of ~14000 square degrees in three passes. Each pass will cover the survey area with ~2000 pointings, each of area ~8 square degrees. The BGS is currently proposed to consist of a bright high priority sample to an r-band magnitude limit r ~ 19.5, with a fainter low priority sample to r ~ 20. The geometry of the DESI fibre positioners in the focal plane of the telescope affects the completeness of the survey and has a non-trivial impact on clustering measurements. Using a BGS mock catalogue, we demonstrate that completeness due to fibre assignment primarily depends on the surface density of galaxies. Completeness is high (>95 per cent) in low-density regions, but very low (<10 per cent) in the centre of massive clusters. We apply the pair inverse probability (PIP) weighting correction to clustering measurements from a BGS mock which has been through the fibre assignment algorithm. This method is only unbiased if it is possible to observe every galaxy pair. To expedite this, we randomly promote a small fraction of the fainter sample to be high priority, and dither the set of tile positions by a small angle. We show that inverse pair weighting combined with angular upweighting provides an unbiased correction to galaxy clustering measurements for the complete three pass survey, and also after one pass, which is highly incomplete.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
European Research Council (ERC); Science and Technology Facilities Council; USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1527349
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 484; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (26)

A test of the nature of cosmic acceleration using galaxy redshift distortions journal January 2008
The 2dF Galaxy Redshift Survey: correlation functions, peculiar velocities and the matter density of the Universe journal November 2003
The VIMOS Public Extragalactic Redshift Survey (VIPERS): Unbiased clustering estimate with VIPERS slit assignment⋆ journal November 2018
Galaxy and Mass Assembly (GAMA): Optimal Tiling of Dense Surveys with a Multi-Object Spectrograph journal January 2010
Bias and variance of angular correlation functions journal July 1993
Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample journal September 2002
The Galaxy Luminosity Function and Luminosity Density at Redshift z = 0.1 journal August 2003
First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters journal September 2003
Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys journal December 2003
HEALPix: A Framework for High‐Resolution Discretization and Fast Analysis of Data Distributed on the Sphere journal April 2005
The Luminosity and Color Dependence of the Galaxy Correlation Function journal September 2005
Percolation Galaxy Groups and Clusters in the SDSS Redshift Survey: Identification, Catalogs, and the Multiplicity Function
  • Berlind, Andreas A.; Frieman, Joshua; Weinberg, David H.
  • The Astrophysical Journal Supplement Series, Vol. 167, Issue 1 https://doi.org/10.1086/508170
journal November 2006
Galaxy Clustering in the Completed sdss Redshift Survey: the Dependence on Color and Luminosity journal July 2011
A new Method to Correct for Fiber Collisions in Galaxy Two-Point Statistics journal August 2012
The Seventh data Release of the Sloan Digital sky Survey journal May 2009
Mitigating the impact of the DESI fiber assignment on galaxy clustering journal March 2017
Imprint of DESI fiber assignment on the anisotropic power spectrum of emission line galaxies journal April 2017
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measuring DA and H at z = 0.57 from the baryon acoustic peak in the Data Release 9 spectroscopic Galaxy sample journal January 2014
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Releases 10 and 11 Galaxy samples journal April 2014
Galaxy and mass assembly (GAMA): projected galaxy clustering journal October 2015
A lightcone catalogue from the Millennium-XXL simulation journal June 2017
Unbiased clustering estimation in the presence of missing observations journal August 2017
Unbiased clustering estimates with the DESI fibre assignment journal August 2018
Using angular pair upweighting to improve 3D clustering measurements journal August 2017
Galaxy and Mass Assembly (GAMA): ugriz galaxy luminosity functions: GAMA luminosity functions journal December 2011
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Release 9 spectroscopic galaxy sample journal December 2012

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