The Buzzard Flock: Dark Energy Survey Synthetic Sky Catalogs

DeRose, J.

Title: The Buzzard Flock: Dark Energy Survey Synthetic Sky Catalogs

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Abstract

We present a suite of 18 synthetic sky catalogs designed to support science analysis of galaxies in the Dark Energy Survey Year 1 (DES Y1) data. For each catalog, we use a computationally efficient empirical approach, ADDGALS, to embed galaxies within light-cone outputs of three dark matter simulations that resolve halos with masses above ~5x10^12 h^-1 m_sun at z <= 0.32 and 10^13 h^-1 m_sun at z~2. The embedding method is tuned to match the observed evolution of galaxy counts at different luminosities as well as the spatial clustering of the galaxy population. Galaxies are lensed by matter along the line of sight --- including magnification, shear, and multiple images --- using CALCLENS, an algorithm that calculates shear with 0.42 arcmin resolution at galaxy positions in the full catalog. The catalogs presented here, each with the same LCDM cosmology (denoted Buzzard), contain on average 820 million galaxies over an area of 1120 square degrees with positions, magnitudes, shapes, photometric errors, and photometric redshift estimates. We show that the weak-lensing shear catalog, redMaGiC galaxy catalogs and redMaPPer cluster catalogs provide plausible realizations of the same catalogs in the DES Y1 data by comparing their magnitude, color and redshift distributions, angular clustering,more »« less

Authors:: DeRose, J.

Publication Date:: Tue Jan 08 00:00:00 EST 2019

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:: DES

OSTI Identifier:: 1527438

Report Number(s):: arXiv:1901.02401; FERMILAB-PUB-19-004-AE
1712697

DOE Contract Number:: AC02-07CH11359

Resource Type:: Journal Article

Journal Name:: TBD

Additional Journal Information:: Journal Name: TBD

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS

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                    DeRose, J., and et al. The Buzzard Flock: Dark Energy Survey Synthetic Sky Catalogs.  United States: N. p., 2019. 
        Web.

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                    DeRose, J., & et al. The Buzzard Flock: Dark Energy Survey Synthetic Sky Catalogs.  United States.

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                    DeRose, J., and et al. 2019.  
        "The Buzzard Flock: Dark Energy Survey Synthetic Sky Catalogs".  United States.  https://www.osti.gov/servlets/purl/1527438.

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@article{osti_1527438,

  title        = {The Buzzard Flock: Dark Energy Survey Synthetic Sky Catalogs},

  author       = {DeRose, J. and et al.},

  abstractNote = {We present a suite of 18 synthetic sky catalogs designed to support science analysis of galaxies in the Dark Energy Survey Year 1 (DES Y1) data. For each catalog, we use a computationally efficient empirical approach, ADDGALS, to embed galaxies within light-cone outputs of three dark matter simulations that resolve halos with masses above ~5x10^12 h^-1 m_sun at z <= 0.32 and 10^13 h^-1 m_sun at z~2. The embedding method is tuned to match the observed evolution of galaxy counts at different luminosities as well as the spatial clustering of the galaxy population. Galaxies are lensed by matter along the line of sight --- including magnification, shear, and multiple images --- using CALCLENS, an algorithm that calculates shear with 0.42 arcmin resolution at galaxy positions in the full catalog. The catalogs presented here, each with the same LCDM cosmology (denoted Buzzard), contain on average 820 million galaxies over an area of 1120 square degrees with positions, magnitudes, shapes, photometric errors, and photometric redshift estimates. We show that the weak-lensing shear catalog, redMaGiC galaxy catalogs and redMaPPer cluster catalogs provide plausible realizations of the same catalogs in the DES Y1 data by comparing their magnitude, color and redshift distributions, angular clustering, and mass-observable relations, making them useful for testing analyses that use these samples. We make public the galaxy samples appropriate for the DES Y1 data, as well as the data vectors used for cosmology analyses on these simulations.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/1527438},
  journal      = {TBD},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Jan 08 00:00:00 EST 2019},

  month        = {Tue Jan 08 00:00:00 EST 2019}

}

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