Yao, J;
Shan, H;
Zhang, P;
Jullo, E;
Kneib, JP;
Yu, Y;
Zu, Y;
... Zhou, Z; + view all
(2023)
DESI and DECaLS (D&D): galaxy–galaxy lensing measurements with 1 per cent survey and its forecast.
Monthly Notices of the Royal Astronomical Society
, 524
(4)
pp. 6071-6084.
10.1093/mnras/stad2221.
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Abstract
The shear measurement from the Dark Energy Camera Legacy Survey (DECaLS) provides an excellent opportunity for galaxy-galaxy lensing study with the Dark Energy Spectroscopic Instrument (DESI) galaxies, given the large (∼9000 deg2) sky overlap. We explore this potential by combining the DESI 1 per cent survey and DECaLS Data Release 8 (DR8). With ∼106 deg2 sky overlap, we achieve significant detection of galaxy-galaxy lensing for Bright Galaxy Survey (BGS) and luminous red galaxy (LRG) as lenses. Scaled to the full BGS sample, we expect the statistical errors to improve from to a promising level of at. This brings stronger requirements for future systematics control. To fully realize such potential, we need to control the residual multiplicative shear bias |m| < 0.006 and the bias in the mean redshift |Δz| < 0.008, requiring the introduced bias in the measurement is <0.31σ. We also expect significant detection of galaxy-galaxy lensing with DESI LRG/emission line galaxy (ELG) full samples as lenses, and cosmic magnification of ELG through cross-correlation with low-redshift DECaLS shear. If such systematical error control can be achieved, we find the advantages of DECaLS, comparing with the Kilo Degree Survey (KiDS) and the Hyper Suprime-Cam (HSC), are at low redshift, large scale, and in measuring the shear ratio (to σR ∼0.04) and cosmic magnification.
| Type: | Article |
|---|---|
| Title: | DESI and DECaLS (D&D): galaxy–galaxy lensing measurements with 1 per cent survey and its forecast |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stad2221 |
| Publisher version: | https://doi.org/10.1093/mnras/stad2221 |
| Language: | English |
| Additional information: | © The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | gravitational lensing: weak – (cosmology:) large-scale structure of Universe – cosmology: observations. |
| 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/10176205 |
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