The DESI One-Percent survey: exploring the Halo Occupation Distribution of Emission Line Galaxies with AbacusSummit simulations
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Published:2023-10-01
Issue:10
Volume:2023
Page:016
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ISSN:1475-7516
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Container-title:Journal of Cosmology and Astroparticle Physics
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language:
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Short-container-title:J. Cosmol. Astropart. Phys.
Author:
Rocher AntoineORCID, Ruhlmann-Kleider VaninaORCID, Burtin Etienne, Yuan SihanORCID, de Mattia Arnaud, Ross Ashley J., Aguilar Jessica, Ahlen StevenORCID, Alam ShadabORCID, Bianchi DavideORCID, Brooks David, Cole ShaunORCID, Dawson Kyle, de la Macorra AxelORCID, Doel Peter, Eisenstein Daniel J., Fanning KevinORCID, Forero-Romero Jaime E.ORCID, Garrison Lehman H.ORCID, Gontcho A Gontcho SatyaORCID, Gonzalez-Perez VioletaORCID, Guy Julien, Hadzhiyska BoryanaORCID, Hahn ChangHoonORCID, Honscheid Klaus, Kisner TheodoreORCID, Landriau MartinORCID, Lasker JamesORCID, E. Levi MichaelORCID, Manera MarcORCID, Meisner AaronORCID, Miquel Ramon, Moustakas JohnORCID, Mueller Eva-Maria, Newman Jeffrey A.ORCID, Nie JundanORCID, Percival Will J.ORCID, Poppett Claire, Qin Fei, Rossi Graziano, Samushia LadoORCID, Sanchez EusebioORCID, Schlegel David, Schubnell Michael, Seo Hee-JongORCID, Tarlé GregoryORCID, Vargas-Magaña MarianaORCID, Weaver Benjamin A., Yu Jiaxi, Zhang HanyuORCID, Zheng ZhengORCID, Zhou ZhiminORCID, Zou HuORCID
Abstract
AbstractThe One-Percent survey of the Dark Energy Spectroscopic Instrument collected ∼ 270kemission line galaxies (ELGs) at 0.8 <z< 1.6. The high completeness of the sample allowed the clustering to be measured down to scales never probed before, 0.04 Mpc/hinrpfor the projected 2-point correlation function (2PCF) and 0.17 Mpc/hin galaxy pair separation s for the 2PCF monopole and quadrupole. The most striking feature of the measurements is a strong signal at the smallest scales, below 0.2 Mpc/hinrpand 1 Mpc/hins. We analyse these data in the halo occupation distribution framework. We consider different distributions for central galaxies, a standard power law for satellites with no condition on the presence of a central galaxy and explore several extensions of these models. For all considered models, the mean halo mass of the sample is found to be log10⟨Mh⟩ ∼ 11.9. We obtain a satellite mean occupation function which agrees with physically motivated ELG models only if we introduce central-satellite conformity, meaning that the satellite occupation is conditioned by the presence of central galaxies of the same type. To achieve in addition a good modelling of the clustering between 0.1 and 1 Mpc/hinrp, we allow for ELG positioning outside of the halo virial radius and find 0.5% of ELGs residing in the outskirts of halos. Furthermore, the satellite velocity dispersion inside halos is found to be ∼ 30% larger than that of the halo dark matter particles. These are the main findings of our work. We investigate assembly bias as a function of halo concentration, local density or local density anisotropies and observe no significant change in our results. We split the data sample in two redshift bins and report no significant evolution with redshift. Lastly, changing the cosmology in the modelling impacts only slightly our results.
Subject
Astronomy and Astrophysics
Cited by
2 articles.
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