Rosella: a mock catalogue from the P-Millennium simulation

Safonova, Sasha; Norberg, Peder; Cole, Shaun

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.

Citation

Safonova, S., Norberg, P., & Cole, S. (2021). Rosella: a mock catalogue from the P-Millennium simulation. Monthly Notices of the Royal Astronomical Society, 505(1), 325-338. https://doi.org/10.1093/mnras/stab1286

• Journal Article Type: Article
• Acceptance Date: Apr 27, 2021
• Online Publication Date: May 6, 2021
• Publication Date: 2021-07
• Deposit Date: Sep 21, 2021
• Publicly Available Date: Sep 21, 2021
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 505
• Issue: 1
• Pages: 325-338
• DOI: https://doi.org/10.1093/mnras/stab1286
• Public URL: https://durham-repository.worktribe.com/output/1239734