期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 496, 期 2, 页码 2262-2291出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1621
关键词
large-scale structure of Universe
资金
- U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-SC0017860]
- Office of Science, Office of High Energy Physics of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility
- U.S. National Science Foundation, Division of Astronomical Sciences [AST-0950945]
- Science and Technologies Facilities Council of the UnitedKingdom
- Gordon and Betty Moore Foundation
- Heising-Simons Foundation
- National Council of Science and Technology of Mexico
- DESI Member Institutions
- U.S. Department of Energy (DOE) [DE-SC0017860] Funding Source: U.S. Department of Energy (DOE)
We evaluate the impact of imaging systematics on the clustering of luminous red galaxies (LRG), emission-line galaxies (ELG), and quasars (QSO) targeted for the upcoming Dark Energy Spectroscopic Instrument (DESI) survey. Using Data Release 7 of the DECam Legacy Survey, we study the effects of astrophysical foregrounds, stellar contamination, differences between north galactic cap and south galactic cap measurements, and variations in imaging depth, stellar density, galactic extinction, seeing, airmass, sky brightness, and exposure time before presenting survey masks and weights to mitigate these effects. With our sanitized samples in hand, we conduct a preliminary analysis of the clustering amplitude and evolution of the DESI main targets. From measurements of the angular correlation functions, we determine power law fits r(0) = 7.78 +/- 0.26 h(-1) Mpc, gamma = 1.98 +/- 0.02 for LRGs and r(0) = 5.45 +/- 0.1 h(-1) Mpc, gamma = 1.54 +/- 0.01 for ELGs. Additionally, from the angular power spectra, we measure the linear biases and model the scale-dependent biases in the weakly non-linear regime. Both sets of clustering measurements show good agreement with survey requirements for LRGs and ELGs, attesting that these samples will enable DESI to achieve precise cosmological constraints. We also present clustering as a function of magnitude, use cross-correlations with external spectroscopy to infer dN/dz and measure clustering as a function of luminosity, and probe higher order clustering statistics through counts-in-cells moments.
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