Galaxy-galaxy lensing with the DES-CMASS catalogue: measurement and constraints on the galaxy-matter cross-correlation

Abstract

The DMASS sample is a photometric sample from the DES Year 1 data set designed to replicate the properties of the CMASS sample from BOSS, in support of a joint analysis of DES and BOSS beyond the small overlapping area. In this paper, we present the measurement of galaxy-galaxy lensing using the DMASS sample as gravitational lenses in the DES Y1 imaging data. We test a number of potential systematics that can bias the galaxy-galaxy lensing signal, including those from shear estimation, photometric redshifts, and observing conditions. After careful systematic tests, we obtain a highly significant detection of the galaxy-galaxy lensing signal, with total $S/N=25.7$. With the measured signal, we assess the feasibility of using DMASS as gravitational lenses equivalent to CMASS, by estimating the galaxy-matter cross-correlation coefficient $r_{\mathrm{cc}}$. By jointly fitting the galaxy-galaxy lensing measurement with the galaxy clustering measurement from CMASS, we obtain $r_{\mathrm{cc}}=1.09_{-0.11}^{+0.12}$ for the scale cut of $4h^{-1}\mathrm{Mpc}$ and $r_{\mathrm{cc}}=1.06_{-0.12}^{+0.13}$ for $12h^{-1}\mathrm{Mpc}$ in fixed cosmology. By adding the angular galaxy clustering of DMASS, we obtain $r_{\mathrm{cc}}=1.06\pm 0.10$ for the scale cut of $4h^{-1}\mathrm{Mpc}$ and $r_{\mathrm{cc}}=1.03\pm 0.11$ for $12h^{-1}\mathrm{Mpc}$. The resulting values of $r_{\mathrm{cc}}$ indicate that the lensing signal of DMASS is statistically consistent with the one that would have been measured if CMASS had populated the DES region within the given statistical uncertainty. The measurement of galaxy-galaxy lensing presented in this paper will serve as part of the data vector for the forthcoming cosmology analysis in preparation.

17 pages, 12 figures, Matches version accepted by MNRAS

References in corpus (13)

• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• Dark energy constraints from cosmic shear power spectra: impact of intrinsic alignments on photometric redshift requirements
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• Extended Limber Approximation
• Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
• The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
• The Weak Lensing Signal and the Clustering of BOSS Galaxies II: Astrophysical and Cosmological Constraints
• Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses
• DES Y3 results: Blending shear and redshift biases in image simulations
• Metacalibration: Direct Self-Calibration of Biases in Shear Measurement
• Testing gravity on large scales by combining weak lensing with galaxy clustering using CFHTLenS and BOSS CMASS
• Testing gravity with galaxy-galaxy lensing and redshift-space distortions using CFHT-Stripe 82, CFHTLenS and BOSS CMASS datasets
• CFHTLenS: Galaxy bias as function of scale, stellar mass, and colour. Conflicts with predictions by semi-analytic models

Cited by in corpus (2)

• Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering
• Probing gravity with the DES-CMASS sample and BOSS spectroscopy