Korytov, D;
Hearin, A;
Kovacs, E;
Larsen, P;
Rangel, E;
Hollowed, J;
Benson, AJ;
... White, M; + view all
(2019)
CosmoDC2: A Synthetic Sky Catalog for Dark Energy Science with LSST.
The Astrophysical Journal: Supplement Series
, 245
(2)
, Article 26. 10.3847/1538-4365/ab510c.
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Abstract
This paper introduces cosmoDC2, a large synthetic galaxy catalog designed to support precision dark energy science with the Large Synoptic Survey Telescope (LSST). CosmoDC2 is the starting point for the second data challenge (DC2) carried out by the LSST Dark Energy Science Collaboration (LSST DESC). The catalog is based on a trillion-particle, (4.225 Gpc)3 box cosmological N-body simulation, the Outer Rim run. It covers 440 deg2 of sky area to a redshift of z = 3 and matches expected number densities from contemporary surveys to a magnitude depth of 28 in the r band. Each galaxy is characterized by a multitude of galaxy properties including stellar mass, morphology, spectral energy distributions, broadband filter magnitudes, host halo information, and weak lensing shear. The size and complexity of cosmoDC2 requires an efficient catalog generation methodology; our approach is based on a new hybrid technique that combines data-based empirical approaches with semianalytic galaxy modeling. A wide range of observation-based validation tests has been implemented to ensure that cosmoDC2 enables the science goals of the planned LSST DESC DC2 analyses. This paper also represents the official release of the cosmoDC2 data set, including an efficient reader that facilitates interaction with the data.
| Type: | Article |
|---|---|
| Title: | CosmoDC2: A Synthetic Sky Catalog for Dark Energy Science with LSST |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4365/ab510c |
| Publisher version: | https://doi.org/10.3847/1538-4365/ab510c |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Galaxies; Cosmology; Large-scale structure of the universe; Dark energy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10100454 |
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