| Title: |
Mitigation of DESI fiber assignment incompleteness effect on two-point clustering with small angular scale truncated estimators |
| Authors: |
Pinon, Mathilde; Gaztañaga, Enrique |
| Contributors: |
Ministerio de Ciencia e Innovación (España); Agencia Estatal de Investigación (España); Department of Energy (US); National Science Foundation (US); Pinon, M.; Gaztañaga, Enrique; Consejo Superior de Investigaciones Científicas https://ror.org/02gfc7t72 |
| Publisher Information: |
IOP Publishing |
| Publication Year: |
2025 |
| Collection: |
Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| Subject Terms: |
Cosmological parameters from LSS; Power spectrum; Redshift surveys |
| Description: |
M. Pinon et al. -- Dark energy spectroscopic instrument (DESI) survey year 1 results ; We present a method to mitigate the effects of fiber assignment incompleteness in two-point power spectrum and correlation function measurements from galaxy spectroscopic surveys, by truncating small angular scales from estimators. We derive the corresponding modified correlation function and power spectrum windows to account for the small angular scale truncation in the theory prediction. We validate this approach on simulations reproducing the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) with and without fiber assignment. We show that we recover unbiased cosmological constraints using small angular scale truncated estimators from simulations with fiber assignment incompleteness, with respect to standard estimators from complete simulations. Additionally, we present an approach to remove the sensitivity of the fits to high k modes in the theoretical power spectrum, by applying a transformation to the data vector and window matrix. We find that our method efficiently mitigates the effect of fiber assignment incompleteness in two-point correlation function and power spectrum measurements, at low computational cost and with little statistical loss. ; This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of High-Energy Physics, under Contract No. DE-AC02-05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract. Additional support for DESI was provided by the U.S. National Science Foundation (NSF), Division of Astronomical Sciences under Contract No. AST-0950945 to the NSF National Optical-Infrared Astronomy Research Laboratory; the Science and Technology Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Humanities, Science ... |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
https://doi.org/10.1088/1475-7516/2025/01/131; Sí; Journal of Cosmology and Astroparticle Physics (JCAP) 01: 131 (2025); https://hdl.handle.net/10261/394873; http://dx.doi.org/10.13039/100000015; http://dx.doi.org/10.13039/100000001; http://dx.doi.org/10.13039/501100004837; http://dx.doi.org/10.13039/501100011033; https://api.elsevier.com/content/abstract/scopus_id/85218918867 |
| DOI: |
10.1088/1475-7516/2025/01/131 |
| DOI: |
10.13039/100000015 |
| DOI: |
10.13039/100000001 |
| DOI: |
10.13039/501100004837 |
| DOI: |
10.13039/501100011033 |
| Availability: |
https://hdl.handle.net/10261/394873; https://doi.org/10.1088/1475-7516/2025/01/131; https://doi.org/10.13039/100000015; https://doi.org/10.13039/100000001; https://doi.org/10.13039/501100004837; https://doi.org/10.13039/501100011033; https://api.elsevier.com/content/abstract/scopus_id/85218918867 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.FC5AD93 |
| Database: |
BASE |