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Rosella: a mock catalogue from the P-Millennium simulation

Safonova, Sasha and Norberg, Peder and Cole, Shaun (2021) 'Rosella: a mock catalogue from the P-Millennium simulation.', Monthly notices of the Royal Astronomical Society, 505 (1). pp. 325-338.


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.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:27 April 2021
Date deposited:21 September 2021
Date of first online publication:06 May 2021
Date first made open access:21 September 2021

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