2020/09/30 by Sasha Gaines, Sasha Safonova, Peder Norberg +2
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Cold dark matter #Cosmology #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy formation and evolution #Physics #Population #Redshift #Rest frame #Stellar, planetary, and galactic studies #astro-ph.CO
paper · pdf · doi:10.1093/mnras/stab1286
14 pages, 14 figures. Accepted at MNRAS in April 2021
openalex created_date 2020/09/08 · arxiv created 2021/04/30 · openalex publication_date 2021/05/04 · arxiv updated 2021/05/12 · openalex updated_date 2026/08/06
ABSTRACT The scientific exploitation of the Dark Energy Spectroscopic Instrument Bright Galaxy Survey (DESI BGS) data requires the construction of mocks with galaxy population properties closely mimicking those of the actual DESI BGS targets. We create a high-fidelity mock galaxy catalogue, including information about galaxies and their host dark matter subhaloes. The mock catalogue uses subhalo abundance matching with scatter to populate the P-Millennium N-body simulation with galaxies at the median BGS redshift of ∼0.2, using formation redshift information to assign 0.1(g − r) rest-frame colours. The mock provides information about r-band absolute magnitudes, 0.1(g − r) rest-frame colours, and 3D positions and velocities of a complete sample of DESI BGS galaxies in a volume of (542 Mpc h−1)3, as well as the masses of host dark matter haloes. This P-Millennium DESI BGS mock catalogue is ideally suited for the tuning of approximate mocks unable to resolve subhaloes that DESI BGS galaxies reside in, to test for systematics in analysis pipelines and to interpret (non-cosmological focused) DESI BGS analysis.