Joint Analysis of Galaxy-Galaxy Lensing and Galaxy Clustering: Methodology and Forecasts for DES
Abstract
The joint analysis of galaxy-galaxy lensing and galaxy clustering is a promising method for inferring the growth function of large scale structure. This analysis will be carried out on data from the Dark Energy Survey (DES), with its measurements of both the distribution of galaxies and the tangential shears of background galaxies induced by these foreground lenses. We develop a practical approach to modeling the assumptions and systematic effects affecting small scale lensing, which provides halo masses, and large scale galaxy clustering. Introducing parameters that characterize the halo occupation distribution (HOD), photometric redshift uncertainties, and shear measurement errors, we study how external priors on different subsets of these parameters affect our growth constraints. Degeneracies within the HOD model, as well as between the HOD and the growth function, are identified as the dominant source of complication, with other systematic effects sub-dominant. The impact of HOD parameters and their degeneracies necessitate the detailed joint modeling of the galaxy sample that we employ. We conclude that DES data will provide powerful constraints on the evolution of structure growth in the universe, conservatively/optimistically constraining the growth function to 7.9\%/4.8\% with its first-year data that covered over 1000 square degrees, and to 3.9\%/2.3\% with its full five-year data that will survey 5000 square degrees, including both statistical and systematic uncertainties.
Keywords
Cite
@article{arxiv.1507.05353,
title = {Joint Analysis of Galaxy-Galaxy Lensing and Galaxy Clustering: Methodology and Forecasts for DES},
author = {Y. Park and E. Krause and S. Dodelson and B. Jain and A. Amara and M. R. Becker and S. L. Bridle and J. Clampitt and M. Crocce and P. Fosalba and E. Gaztanaga and K. Honscheid and E. Rozo and F. Sobreira and C. Sánchez and R. H. Wechsler and T. Abbott and F. B Abdalla and S. Allam 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 L. N. da Costa and D. L. DePoy and S. Desai and J. P. Dietrich and P. Doel and T. F. Eifler and A. Fausti Neto and E. Fernandez and D. A. Finley and B. Flaugher and D. W. Gerdes and D. Gruen and R. A. Gruendl and G. Gutierrez and D. J. James and S. Kent and K. Kuehn and N. Kuropatkin and M. Lima and M. A. G. Maia and J. L. Marshall and P. Melchior and C. J. Miller and R. Miquel and R. C. Nichol and R. Ogando and A. A. Plazas and N. Roe and A. K. Romer and E. S. Rykoff and E. Sanchez and V. Scarpine and M. Schubnell and I. Sevilla-Noarbe and M. Soares-Santos and E. Suchyta and M. E. C. Swanson and G. Tarle and J. Thaler and V. Vikram and A. R. Walker and J. Weller and J. Zuntz},
journal= {arXiv preprint arXiv:1507.05353},
year = {2016}
}
Comments
26 pages, 15 figures. Author list corrected