The DESI One-Percent Survey: Exploring the Halo Occupation Distribution of Luminous Red Galaxies and Quasi-Stellar Objects with AbacusSummit

Sihan Yuan, Hanyu Zhang, Ashley J. Ross, Jamie Donald-McCann, Boryana Hadzhiyska, Risa H. Wechsler, Zheng Zheng, Shadab Alam, Violeta Gonzalez-Perez, Jessica Nicole Aguilar, Steven Ahlen, Davide Bianchi, David Brooks, Axel de la Macorra, Kevin Fanning, Jaime E. Forero-Romero, Klaus Honscheid, Mustapha Ishak, Robert Kehoe, James LaskerMartin Landriau, Marc Manera, Paul Martini, Aaron Meisner, Ramon Miquel, John Moustakas, Seshadri Nadathur, Jeffrey A. Newman, Jundan Nie, Will Percival, Claire Poppett, Antoine Rocher, Graziano Rossi, Eusebio Sanchez, Lado Samushia, Michael Schubnell, Hee-Jong Seo, Gregory Tarle, Benjamin Alan Weaver, Jiaxi Yu, Zhimin Zhou, Hu Zou

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We present the first comprehensive Halo Occupation Distribution (HOD) analysis of the DESI One-Percent survey Luminous Red Galaxy (LRG) and Quasi-Stellar Object (QSO) samples. We constrain the HOD of each sample and test possible HOD extensions by fitting the redshift-space galaxy 2-point correlation functions in 0.15 < r < 32 Mpc/h in a set of fiducial redshift bins. We use AbacusSummit cubic boxes at Planck 2018 cosmology as model templates and forward model galaxy clustering with the AbacusHOD package. We achieve good fits with a standard HOD model with velocity bias, and we find no evidence for galaxy assembly bias or satellite profile modulation at the current level of statistical uncertainty. For LRGs in 0.4 < z < 0.6, we infer a satellite fraction of fsat = 11+-1%, a mean halo mass of log10 Mh = 13.40+0.02-0.02, and a linear bias of blin = 1.93+0.06-0.04. For LRGs in 0.6 < z < 0.8, we find fsat = 14+-1%, log10 Mh = 13.24+0.02-0.02, and blin = 2.08+0.03-0.03. For QSOs, we infer fsat = 3+8-2%, log10 Mh = 12.65+0.09-0.04, and blin = 2.63+0.37-0.26 in redshift range 0.8 < z < 2.1. Using these fits, we generate a large suite of high-fidelity galaxy mocks. We also study the redshift-evolution of the DESI LRG sample from z = 0.4 up to z = 1.1, revealing significant and interesting trends in mean halo mass, linear bias, and satellite fraction.
Original languageEnglish
Pages (from-to)947–965
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date10 Apr 2024
Publication statusPublished - 1 May 2024


  • astro-ph.CO
  • methods: numerical
  • methods: statistical
  • galaxies: haloes
  • large-scale structure of Universe
  • UKRI
  • STFC

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