Kitanidis, E;
White, M;
Feng, Y;
Schlegel, D;
Guy, J;
Dey, A;
Landriau, M;
... Weaver, BA; + view all
(2020)
Imaging systematics and clustering of DESI main targets.
Monthly Notices of the Royal Astronomical Society
, 496
(2)
pp. 2262-2291.
10.1093/mnras/staa1621.
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Abstract
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 r0=7.78±0.26h−1Mpc, γ = 1.98 ± 0.02 for LRGs and r0=5.45±0.1h−1Mpc, γ = 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.
| Type: | Article |
|---|---|
| Title: | Imaging systematics and clustering of DESI main targets |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/staa1621 |
| Publisher version: | https://doi.org/10.1093/mnras/staa1621 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, large-scale structure of Universe, HIGHER-ORDER STATISTICS, LUMINOUS RED GALAXIES, DIGITAL SKY SURVEY, REDSHIFT DISTRIBUTIONS, PHOTOMETRIC REDSHIFTS, DARK ENERGY, BIAS, EVOLUTION, EMISSION, ERROR |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10109525 |
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