编辑: 学冬欧巴么么哒 | 2019-07-11 |
9 October
2017 Compiled using MNRAS L A TEX style ?le v3.
0 Dark Energy Survey Year
1 Results: Cross-Correlation Redshifts in the DES C Calibration of the Weak Lensing Source Redshift Distributions C. Davis1, M. Gatti2, P. Vielzeuf2, R. Cawthon3, E. Rozo4, A. Alarcon5, G. M. Bernstein6, C. Bonnett2, A. Carnero Rosell7,8, F. J. Castander5, C. Chang3, L. N. da Costa7,8, T. M. Davis9,10, J. De Vicente11, J. DeRose12,1, A. Drlica-Wagner13, J. Elvin-Poole14, E. Gaztanaga5, D. Gruen1,15, J. Gschwend7,8, W. G. Hartley16,17, B. Hoyle18, H. Lin13, M. A. G. Maia7,8, R. Miquel19,2, R. L. C. Ogando7,8, M. M. Rau18, A. Roodman1,15, E. S. Ryko?1,15, I. Sevilla-Noarbe11, M. A. Troxel20,21, R. H. Wechsler12,1,15, T. M. C. Abbott22, F. B. Abdalla16,23, S. Allam13, J. Annis13, K. Bechtol24, A. Benoit-L? evy25,16,26, D. Brooks16, E. Buckley-Geer13, D. L. Burke1,15, M. Carrasco Kind27,28, J. Carretero2, M. Crocce5, C. E. Cunha1, S. Desai29, H. T. Diehl13, P. Doel16, T. F. Ei?er30,31, B. Flaugher13, J. Frieman13,3, J. Garc? ?a-Bellido32, D. W. Gerdes33,34, R. A. Gruendl27,28, G. Gutierrez13, K. Honscheid20,21, D. J. James35, T. Jeltema36, E. Krause1, R. Kron13,3, K. Kuehn37, N. Kuropatkin13, O. Lahav16, M. Lima38,7, M. March6, J. L. Marshall39, F. Menanteau27,28, R. C. Nichol40, B. Nord13, A. A. Plazas31, E. Sanchez11, V. Scarpine13, R. Schindler15, M. Smith41, M. Soares-Santos13, F. Sobreira42,7, E. Suchyta43, M. E. C. Swanson28, G. Tarle34, D. Thomas40, D. L. Tucker13, V. Vikram44, A. R. Walker22, J. Zuntz45 (DES Collaboration) Accepted XXX. Received YYY;
in original form ZZZ ABSTRACT We present the calibration of the Dark Energy Survey Year
1 (DES Y1) weak lensing source galaxy redshift distributions from clustering measurements. By cross-correlating the positions of source galaxies with luminous red galaxies selected by the redMaGiC algorithm we measure the redshift distributions of the source galaxies as placed into di?erent tomographic bins. These measurements constrain any such shifts to an accu- racy of ? 0.02 and can be computed even when the clustering measurements do not span the full redshift range. The highest-redshift source bin is not constrained by the clustering measurements because of the minimal redshift overlap with the redMaGiC galaxies. We compare our constraints with those obtained from COSMOS 30-band pho- tometry and ?nd that our two very di?erent methods produce consistent constraints. Key words: galaxies: distances and redshifts C large-scale structure of Universe C surveys
1 INTRODUCTION The Dark Energy Survey (DES) Year
1 (Y1) Key Project (DES Collaboration et al. 2017) constrains cosmological pa- rameters by combining three distinct measurements of the growth of large scale structure over
1321 deg2: ?rst, measure- ments of the weak lensing shear ?elds (Troxel et al. 2017) A?liations are listed at the end of the paper. from the cross-correlations of the measured shapes of
26 mil- lion source galaxies divided into four redshift bins (Zuntz et al. 2017) from 0.2 <
z <
1.3;
second, cross-correlations of source galaxy shapes (Prat et al. 2017) with the positions of 650,000 luminous red ( lens ) galaxies at 0.15 <
z <
0.9 as determined by the redMaGiC algorithm (Rozo et al. 2016);
third, the auto-correlations of the positions of redMaGiC galaxies (Elvin-Poole et al. 2017). Undergirding our cos- mological constraints are estimates of the redshifts of these ?
2017 The Authors arXiv:1710.02517v1 [astro-ph.CO]