DESI and DECaLS (D&D): galaxy–galaxy lensing measurements with 1 per cent survey and its forecast

Journal Article · Wed Jul 26 00:00:00 EDT 2023 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stad2221· OSTI ID:2007183

Yao, Ji  ^[1]; Shan, Huanyuan ^[2]; Zhang, Pengjie ^[3]; Jullo, Eric ^[4]; Kneib, Jean-Paul ^[5]; Yu, Yu  ^[3]; Zu, Ying  ^[3]; Brooks, David ^[6]; de la Macorra, Axel ^[7]; Doel, Peter ^[6]; Font-Ribera, Andreu  ^[8]; Gontcho, Satya A.  ^[9]; Kisner, Theodore ^[9]; Landriau, Martin ^[9]; Meisner, Aaron ^[10]; Miquel, Ramon ^[11]; Nie, Jundan ^[12]; Poppett, Claire ^[13]; Prada, Francisco ^[14]; Schubnell, Michael ^[15] ; Magana, Mariana Vargas ^[7]; Zhou, Zhimin ^[12]

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1. Shanghai Astronomical Observatory (SHAO) (China); Shanghai Jiao Tong University (China); Key Laboratory for Particle Astrophysics and Cosmology (MOE)/Shanghai Key Laboratory for Particle Physics and Cosmology (China)
2. Shanghai Astronomical Observatory (SHAO) (China); University of Chinese Academy of Sciences, Beijing (China)
3. Shanghai Jiao Tong University (China); Key Laboratory for Particle Astrophysics and Cosmology (MOE)/Shanghai Key Laboratory for Particle Physics and Cosmology (China)
4. Aix-Marseille Univ., Marseille (France)
5. Aix-Marseille Univ., Marseille (France); Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
6. University College London (United Kingdom)
7. Universidad Nacional Autonoma´de Mexico (Mexico)
8. The Barcelona Institute of Science and Technology (Spain)
9. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
10. NSF’s NOIRLab, Tucson, AZ (United States)
11. The Barcelona Institute of Science and Technology (Spain); Institucio´ Catalana de Recerca i Estudis Avancats, Barcelona (Spain)
12. Chinese Academy of Sciences (CAS), Beijing (China)
13. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
14. Instituto de Astrofísica de Andalucía (CSIC), Granada (Spain)
15. University of Michigan, Ann Arbor, MI (United States)

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 $$18(12)\,{\rm per \ cent}$$ to a promising level of $$2(1.3)\,{\rm per \ cent}$$ at $$\theta \gt 8\,\mathrm{ arcmin} \, (\lt 8\,\mathrm{ arcmin})$$. 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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); NSFC of China; Shanghai Committee of Science and Technology; Chinese Academy of Sciences; China Postdoctoral Science Foundation; Shanghai Post-doctoral Excellence Program
• Grant/Contract Number: AC02-05CH11231; 11973070; 19ZR1466600; ZDBS-LY-7013; 11621303; 12203084; 2021T140451; 2021419
• OSTI ID: 2007183
• Alternate ID(s): OSTI ID: 2305491
• Journal Information: Monthly Notices of the Royal Astronomical Society, Vol. 524, Issue 4; ISSN 0035-8711
• Publisher: Oxford University Press
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
gravitational lensing: weak
(cosmology:) large-scale structure of Universe
cosmology: observations