The LSST DESC data challenge 1: generation and analysis of synthetic images for next-generation surveys
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- Department of Physics and Astronomy, University of California, Frederick Reines Hall, Irvine, CA 92697, USA, Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA
- Department of Physics , Duke University, Durham, NC 27708, USA
- Department of Physics, Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Rd, Piscataway, NJ 08854, USA
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, CA 94025, USA
- Department of Astronomy, University of Washington, Seattle, WA 98195, USA
- Department of Physics and Astronomy, University of California, Frederick Reines Hall, Irvine, CA 92697, USA
- McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
- Brookhaven National Laboratory, Upton, NY 11973, USA
- Pittsburgh Particle Physics, Astrophysics, Cosmology Center (PITT PACC), Physics and Astronomy Department, University of Pittsburgh, Pittsburgh, PA 15260, USA
- Princeton University, Princeton, NJ 08544, USA
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA, Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61820, USA
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA
- LSST Project Office, Tucson, AZ 85721, USA
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
- Benedictine University, 5700 College Road, Lisle, IL 60532, USA
- Large Synoptic Survey Telescope, Tucson, AZ 85721, USA
Data Challenge 1 (DC1) is the first synthetic data set produced by the Rubin Observatory Legacy Survey of Space and Time (LSST) Dark Energy Science Collaboration (DESC). DC1 is designed to develop and validate data reduction and analysis and to study the impact of systematic effects that will affect the LSST data set. DC1 is comprised of r-band observations of 40 deg2 to 10 yr LSST depth. We present each stage of the simulation and analysis process: (a) generation, by synthesizing sources from cosmological N-body simulations in individual sensor-visit images with different observing conditions; (b) reduction using a development version of the LSST Science Pipelines; and (c) matching to the input cosmological catalogue for validation and testing. We verify that testable LSST requirements pass within the fidelity of DC1. We establish a selection procedure that produces a sufficiently clean extragalactic sample for clustering analyses and we discuss residual sample contamination, including contributions from inefficiency in star–galaxy separation and imperfect deblending. We compute the galaxy power spectrum on the simulated field and conclude that: (i) survey properties have an impact of 50 percent of the statistical uncertainty for the scales and models used in DC1; (ii) a selection to eliminate artefacts in the catalogues is necessary to avoid biases in the measured clustering; and (iii) the presence of bright objects has a significant impact (2σ–6σ) in the estimated power spectra at small scales (ℓ > 1200), highlighting the impact of blending in studies at small angular scales in LSST.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- Contributing Organization:
- The LSST Dark Energy Science Collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0009920; SC0010007; SC0011636; SC0010008; AC02-76SF00515; SC0010118; AC02-05CH11231
- OSTI ID:
- 1641874
- Alternate ID(s):
- OSTI ID: 1597064; OSTI ID: 1755671
- Report Number(s):
- arXiv:2001.00941; FERMILAB-PUB-19-618-AE
- Journal Information:
- Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 497 Journal Issue: 1; ISSN 0035-8711
- Publisher:
- Royal Astronomical SocietyCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
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