The DESI One-Percent survey: exploring the Halo Occupation Distribution of Emission Line Galaxies with AbacusSummit simulations
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- University Paris-Saclay, Gif-sur-Yvette (France); SLAC
- University Paris-Saclay, Gif-sur-Yvette (France)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- The Ohio State University, Columbus, OH (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Boston University, MA (United States)
- Tata Institute of Fundamental Research, Mumbai (India)
- Università degli Studi di Milano, Milano (Italy)
- University College London (United Kingdom)
- Durham University (United Kingdom)
- University of Utah, Salt Lake City, UT (United States)
- Universidad Nacional Autónoma de México (Mexico)
- Harvard and Smithsonian, Cambridge, MA (United States)
- Universidad de los Andes, Bogota (Columbia)
- Flatiron Institute, New York, NY (United States)
- Universidad Autónoma de Madrid (Spain)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
- Princeton University, NJ (United States)
- Southern Methodist University, Dallas, TX (United States)
- Barcelona Institute of Science and Technology (Spain)
- NSF's NOIRLab, Tucson, AZ (United States)
- Institució Catalana de Recerca i Estudis Avançats, Passeig de Lluís Companys, Barcelona (Spain); Barcelona Institute of Science and Technology (Spain)
- Siena College, Loudonville, NY (United States)
- University of Sussex, Brighton (United Kingdom)
- University of Pittsburgh, PA (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
- University of Waterloo, ON (Canada); Perimeter Institute for Theoretical Physics, Waterloo (Canada)
- Korea Astronomy and Space Science Institute, Daejeon (Korea, Republic of)
- Sejong University, Seoul (Korea, Republic of)
- Abastumani Astrophysical Observatory, Tbilisi (Georgia); Kansas State University, Manhattan, KS (United States); Ilia State University, Tbilisi (Gerogia)
- CIEMAT, Madrid (Spain)
- University of Michigan, Ann Arbor, MI (United States)
- Ohio University, Athens, OH (United States)
- Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
- Kansas State University, Manhattan, KS (United States)
The One-Percent survey of the Dark Energy Spectroscopic Instrument collected ~ 270k emission 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/h in rp for the projected 2-point correlation function (2PCF) and 0.17 Mpc/h in 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/h in rp and 1 Mpc/h in s. 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 $$\langle$$Mh$$\rangle$$ ~ 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/h in rp, 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. Here 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.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Gordon and Betty Moore Foundation; Heising-Simons Foundation; National Council of Science and Technology of Mexico (CONACYT); French Alternative Energies and Atomic Energy Commission (CEA)
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231
- OSTI ID:
- 2326996
- Alternate ID(s):
- OSTI ID: 2368517
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 10 Vol. 2023; ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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