51. Dark Energy Survey year 1 results: Galaxy-galaxy lensing
- Author
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Keith Bechtol, B. Flaugher, David Thomas, H. T. Diehl, A. K. Romer, David Bacon, Paul Martini, Elisabeth Krause, Eli S. Rykoff, J. Prat, Joe Zuntz, Niall MacCrann, Marcos Lima, Masao Sako, W. G. Hartley, G. Gutierrez, C. Davis, A. Roodman, J. Gschwend, R. P. Rollins, M. D. Johnson, Gary Bernstein, R. H. Schindler, Tommaso Giannantonio, R. C. Smith, L. F. Secco, R. Cawthon, G. Tarle, Ramon Miquel, A. Carnero Rosell, Tesla E. Jeltema, F. J. Castander, I. Sevilla-Noarbe, E. Rozo, C. Sánchez, Douglas L. Tucker, Kyler Kuehn, Brian Yanny, Enrique Fernández, Michael Schubnell, Daniel Gruen, Shantanu Desai, A. A. Plazas, T. M. C. Abbott, J. Carretero, E. Buckley-Geer, Alex Drlica-Wagner, Daniel A. Goldstein, Juan Garcia-Bellido, Y. Fang, A. Benoit-Lévy, E. J. Sanchez, T. N. Varga, E. M. Huff, E. Bertin, Jonathan Blazek, L. N. da Costa, D. W. Gerdes, Mathew Smith, Oliver Friedrich, J. P. Dietrich, Donnacha Kirk, Tenglin Li, Scott Dodelson, D. L. Burke, Chihway Chang, Alistair R. Walker, A. Alarcon, Carlos E. Cunha, M. Gatti, Marcelle Soares-Santos, C. B. D'Andrea, S. E. Kuhlmann, Erin Sheldon, Felipe Menanteau, Joseph J. Mohr, Michael Troxel, David J. James, M. E. C. Swanson, S. Allam, Robert A. Gruendl, Martin Crocce, Jennifer L. Marshall, Pablo Fosalba, J. Annis, Ashley J. Ross, K. Honscheid, Joshua A. Frieman, Brian Nord, Risa H. Wechsler, J. De Vicente, Flavia Sobreira, S. Samuroff, M. W. G. Johnson, M. March, Markus Michael Rau, Matt J. Jarvis, P. Vielzeuf, Yanxi Zhang, Tim Eifler, M. Carrasco Kind, Robert C. Nichol, Ofer Lahav, Enrique Gaztanaga, Vinu Vikram, Filipe B. Abdalla, V. Scarpine, David J. Brooks, Bhuvnesh Jain, Jack Elvin-Poole, Peter Melchior, E. Suchyta, Ben Hoyle, N. Kokron, M. A. G. Maia, Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and DES
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Physics and Astronomy (miscellaneous) ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Cosmology ,cosmic rays ,Consistency (statistics) ,0103 physical sciences ,Experiments in gravity ,010303 astronomy & astrophysics ,STFC ,QC ,Astrophysics::Galaxy Astrophysics ,Photometric redshift ,Physics ,COSMIC cancer database ,010308 nuclear & particles physics ,RCUK ,Astronomy ,Redshift ,Galaxy ,Dark energy ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,cosmology ,Jackknife resampling ,Astrophysics - Cosmology and Nongalactic Astrophysics - 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 $0.15 < z < 0.9$. 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 $0.2 < z < 1.3$. 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-$z$ 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 $r$ 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., 26 pages, 19 figures. Matches the version accepted by PRD
- Published
- 2018
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