Non-local contribution from small scales in galaxy–galaxy lensing: comparison of mitigation schemes

Desai, Shantanu (2023) Non-local contribution from small scales in galaxy–galaxy lensing: comparison of mitigation schemes. Monthly Notices of the Royal Astronomical Society, 522 (1). pp. 412-425. ISSN 0035-8711

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Abstract

Recent cosmological analyses with large-scale structure and weak lensing measurements, usually referred to as 3 × 2pt, had to discard a lot of signal to noise from small scales due to our inability to accurately model non-linearities and baryonic effects. Galaxy–galaxy lensing, or the position–shear correlation between lens and source galaxies, is one of the three two-point correlation functions that are included in such analyses, usually estimated with the mean tangential shear. However, tangential shear measurements at a given angular scale θ or physical scale R carry information from all scales below that, forcing the scale cuts applied in real data to be significantly larger than the scale at which theoretical uncertainties become problematic. Recently, there have been a few independent efforts that aim to mitigate the non-locality of the galaxy–galaxy lensing signal. Here, we perform a comparison of the different methods, including the Y-transformation, the point-mass marginalization methodology, and the annular differential surface density statistic. We do the comparison at the cosmological constraints level in a combined galaxy clustering and galaxy–galaxy lensing analysis. We find that all the estimators yield equivalent cosmological results assuming a simulated Rubin Observatory Legacy Survey of Space and Time (LSST) Year 1 like set-up and also when applied to DES Y3 data. With the LSST Y1 set-up, we find that the mitigation schemes yield ∼1.3 times more constraining S8 results than applying larger scale cuts without using any mitigation scheme.

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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Uncontrolled Keywords:

cosmological parameters; cosmology: theory; gravitational lensing: weak; large-scale structure of Universe; Cosmology; Signal to noise ratio; Uncertainty analysis; Cosmological parameters; Cosmology: theory; Galaxies-galaxies; Gravitational lensing: weak; Large scale structure of universe; Large-scale structure; Mitigation schemes; Nonlocal; Small scale; Space and time; Galaxies

Subjects:

Physics
Physics > Astronomy Astrophysics

Divisions:

Department of Physics

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

05 Jan 2024 15:10

Last Modified:

05 Jan 2024 15:10

URI:

http://raiithold.iith.ac.in/id/eprint/11776