Galaxy-Galaxy Lensing in the DES Science Verification Data
Abstract
We present galaxy-galaxy lensing results from 139 square degrees of Dark Energy Survey (DES) Science Verification (SV) data. Our lens sample consists of red galaxies, known as redMaGiC, which are specifically selected to have a low photometric redshift error and outlier rate. The lensing measurement has a total signal-to-noise of 29 over scales Mpc/, including all lenses over a wide redshift range . Dividing the lenses into three redshift bins for this constant moving number density sample, we find no evidence for evolution in the halo mass with redshift. We obtain consistent results for the lensing measurement with two independent shear pipelines, ngmix and im3shape. We perform a number of null tests on the shear and photometric redshift catalogs and quantify resulting systematic uncertainties. Covariances from jackknife subsamples of the data are validated with a suite of 50 mock surveys. The results and systematics checks in this work provide a critical input for future cosmological and galaxy evolution studies with the DES data and redMaGiC galaxy samples. We fit a Halo Occupation Distribution (HOD) model, and demonstrate that our data constrains the mean halo mass of the lens galaxies, despite strong degeneracies between individual HOD parameters.
Keywords
Cite
@article{arxiv.1603.05790,
title = {Galaxy-Galaxy Lensing in the DES Science Verification Data},
author = {J. Clampitt and C. Sánchez and J. Kwan and E. Krause and N. MacCrann and Y. Park and M. A. Troxel and B. Jain and E. Rozo and E. S. Rykoff and R. H. Wechsler and J. Blazek and C. Bonnett and M. Crocce and Y. Fang and E. Gaztanaga and D. Gruen and M. Jarvis and R. Miquel and J. Prat and A. J. Ross and E. Sheldon and J. Zuntz and T. M. C. Abbott and F. B. Abdalla and R. Armstrong and M. R. Becker and A. Benoit-Lévy and G. M. Bernstein and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and C. E. Cunha and C. B. D'Andrea and L. N. da Costa and S. Desai and H. T. Diehl and J. P. Dietrich and P. Doel and J. Estrada and A. E. Evrard and A. Fausti Neto and B. Flaugher and P. Fosalba and J. Frieman and R. A. Gruendl and K. Honscheid and D. J. James and K. Kuehn and N. Kuropatkin and O. Lahav and M. Lima and M. March and J. L. Marshall and P. Martini and P. Melchior and J. J. Mohr and R. C. Nichol and B. Nord and A. A. Plazas and A. K. Romer and E. Sanchez and V. Scarpine and M. Schubnell and I. Sevilla-Noarbe and R. C. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and V. Vikram and A. R. Walker},
journal= {arXiv preprint arXiv:1603.05790},
year = {2017}
}
Comments
15 pages, 10 figures; Matches version accepted by MNRAS