Dark Energy Survey Year 1 Results: Galaxy-Galaxy Lensing
Abstract
We present galaxy-galaxy lensing measurements from 1321 sq. deg. of the Dark Energy Survey (DES) Year 1 (Y1) data. The lens sample consists of a selection of 660,000 red galaxies with high-precision photometric redshifts, known as redMaGiC, split into five tomographic bins in the redshift range . We use two different source samples, obtained from the Metacalibration (26 million galaxies) and Im3shape (18 million galaxies) shear estimation codes, which are split into four photometric redshift bins in the range . We perform extensive testing of potential systematic effects that can bias the galaxy-galaxy lensing signal, including those from shear estimation, photometric redshifts, and observational properties. Covariances are obtained from jackknife subsamples of the data and validated with a suite of log-normal simulations. We use the shear-ratio geometric test to obtain independent constraints on the mean of the source redshift distributions, providing validation of those obtained from other photo- studies with the same data. We find consistency between the galaxy bias estimates obtained from our galaxy-galaxy lensing measurements and from galaxy clustering, therefore showing the galaxy-matter cross-correlation coefficient to be consistent with one, measured over the scales used for the cosmological analysis. The results in this work present one of the three two-point correlation functions, along with galaxy clustering and cosmic shear, used in the DES cosmological analysis of Y1 data, and hence the methodology and the systematics tests presented here provide a critical input for that study as well as for future cosmological analyses in DES and other photometric galaxy surveys.
Keywords
Cite
@article{arxiv.1708.01537,
title = {Dark Energy Survey Year 1 Results: Galaxy-Galaxy Lensing},
author = {J. Prat and C. Sánchez and Y. Fang and D. Gruen and J. Elvin-Poole and N. Kokron and L. F. Secco and B. Jain and R. Miquel and N. MacCrann and M. A. Troxel and A. Alarcon and D. Bacon and G. M. Bernstein and J. Blazek and R. Cawthon and C. Chang and M. Crocce and C. Davis and J. De Vicente and J. P. Dietrich and A. Drlica-Wagner and O. Friedrich and M. Gatti and W. G. Hartley and B. Hoyle and E. M. Huff and M. Jarvis and M. M. Rau and R. P. Rollins and A. J. Ross and E. Rozo and E. S. Rykoff and S. Samuroff and E. Sheldon and T. N. Varga and P. Vielzeuf and J. Zuntz and T. M. C. Abbott and F. B. Abdalla and S. Allam and J. Annis and K. Bechtol and A. Benoit-Lévy and E. Bertin and D. Brooks and E. Buckley-Geer and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and F. J. Castander and C. E. Cunha and C. B. D'Andrea and L. N. da Costa and S. Desai and H. T. Diehl and S. Dodelson and T. F. Eifler and E. Fernandez and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and E. Gaztanaga and D. W. Gerdes and T. Giannantonio and D. A. Goldstein and R. A. Gruendl and J. Gschwend and G. Gutierrez and K. Honscheid and D. J. James and T. Jeltema and M. W. G. Johnson and M. D. Johnson and D. Kirk and E. Krause and K. Kuehn and S. Kuhlmann and O. Lahav and T. S. Li and M. Lima and M. A. G. Maia and M. March and J. L. Marshall and P. Martini and P. Melchior and F. Menanteau and J. J. Mohr and R. C. Nichol and B. Nord and A. A. Plazas and A. K. Romer and A. Roodman and M. Sako and E. Sanchez and V. Scarpine and R. Schindler and M. Schubnell and I. Sevilla-Noarbe and M. Smith 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 D. L. Tucker and V. Vikram and A. R. Walker and R. H. Wechsler and B. Yanny and Y. Zhang},
journal= {arXiv preprint arXiv:1708.01537},
year = {2018}
}
Comments
26 pages, 19 figures. Matches the version accepted by PRD