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Galaxy Clustering for Combined Probes DES-2017-0225 FERMILAB-PUB-17-280-AE Dark Energy Survey Year 1 Results: Galaxy clustering for combined probes J. Elvin-Poole,1 M. Crocce,2 A. J. Ross,3 T. Giannantonio,4, 5, 6 E. Rozo,7 E. S. Ryko↵,8, 9 S. Avila,10, 11 N. Banik,12, 13 J. Blazek,14, 3 S. L. Bridle,1 R. Cawthon,15 A. Drlica-Wagner,12 O. Friedrich,6, 16 N. Kokron,17, 18 E. Krause,9 N. MacCrann,3, 19 J. Prat,20 C. S´anchez,20 L. F. Secco,21 I. Sevilla-Noarbe,10 M. A. Troxel,3, 19 T. M. C. Abbott,22 F. B. Abdalla,23, 24 S. Allam,12 J. Annis,12 J. Asorey,25, 26 K. Bechtol,27 M. R. Becker,9, 28 A. Benoit-L´evy,23, 29, 30 G. M. Bernstein,21 E. Bertin,30, 29 D. Brooks,23 E. Buckley-Geer,12 D. L. Burke,8, 9 A. Carnero Rosell,31, 18 D. Carollo,26, 32 M. Carrasco Kind,33, 34 J. Carretero,20 F. J. Castander,2 C. E. Cunha,9 C. B. D’Andrea,21 L. N. da Costa,18, 31 T. M. Davis,25, 26 C. Davis,9 S. Desai,35 H. T. Diehl,12 J. P. Dietrich,36, 37 S. Dodelson,12, 15 P. Doel,23 T. F. Eifler,38, 39 A. E. Evrard,40, 41 E. Fernandez,20 B. Flaugher,12 P. Fosalba,2 J. Frieman,12, 15 J. Garc´ıa-Bellido,42 E. Gaztanaga,2 D. W. Gerdes,41, 40 K. Glazebrook,43 D. Gruen,8, 9 R. A. Gruendl,33, 34 J. Gschwend,31, 18 G. Gutierrez,12 W. G. Hartley,23, 44 S. R. Hinton,25 K. Honscheid,3, 19 J. K. Hoormann,25 B. Jain,21 D. J. James,45 M. Jarvis,21 T. Jeltema,46 M. W. G. Johnson,33 M. D. Johnson,33 A. King,25 K. Kuehn,47 S. Kuhlmann,48 N. Kuropatkin,12 O. Lahav,23 G. Lewis,49, 26 T. S. Li,12 C. Lidman,47, 26 M. Lima,17, 18 H. Lin,12 E. Macaulay,25 M. March,21 J. L. Marshall,50 P. Martini,3, 51 P. Melchior,52 F. Menanteau,34, 33 R. Miquel,20, 53 J. J. Mohr,16, 37, 36 A. M¨oller,54, 26 R. C. Nichol,11 B. Nord,12 C. R. O’Neill,25, 26 W.J. Percival,11 D. Petravick,33 A. A. Plazas,39 A. K. Romer,55, 8 M. Sako,21 E. Sanchez,10 V. Scarpine,12 R. Schindler,8 M. Schubnell,41 E. Sheldon,56 M. Smith,57 R. C. Smith,22 M. Soares-Santos,12 F. Sobreira,18, 58 N. E. Sommer,54, 26 E. Suchyta,59 M. E. C. Swanson,33 G. Tarle,41 D. Thomas,11, 19 B. E. Tucker,26, 54 D. L. Tucker,12 S. A. Uddin,26, 60 V. Vikram,48 A. R. Walker,22 R. H. Wechsler,8, 28, 9 J. Weller,36, 16, 6 W. Wester,12 R. C. Wolf,21 F. Yuan,26, 54 B. Zhang,54, 26 and J. Zuntz61 (DES Collaboration) 1Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, UK 2Institute of Space Sciences, IEEC-CSIC, Campus UAB, Carrer de Can Magrans, s/n, 08193 Barcelona, Spain 3Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA 4Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK 5Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK 6Universit¨ats-Sternwarte, Fakult¨atf¨urPhysik, Ludwig-Maximilians Universit¨atM¨unchen, Scheinerstr. 1, 81679 M¨unchen, Germany 7Department of Physics, University of Arizona, Tucson, AZ 85721, USA 8SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA 9Kavli Institute for Particle Astrophysics & Cosmology, P. O. Box 2450, Stanford University, Stanford, CA 94305, USA 10Centro de Investigaciones Energ´eticas, Medioambientales y Tecnol´ogicas (CIEMAT), Madrid, Spain 11Institute of Cosmology & Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, UK 12Fermi National Accelerator Laboratory, P. O. Box 500, Batavia, IL 60510, USA 13Department of Physics, University of Florida, Gainesville, Florida 32611, USA 14Institute of Physics, Laboratory of Astrophysics, Ecole´ Polytechnique F´ed´erale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland 15Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA 16Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, 85748 Garching, Germany 17Departamento de F´ısica Matem´atica, Instituto de F´ısica, Universidade de S˜aoPaulo, CP 66318, S˜aoPaulo, SP, 05314-970, Brazil 18Laborat´orio Interinstitucional de e-Astronomia - LIneA, Rua Gal. Jos´eCristino 77, Rio de Janeiro, RJ - 20921-400, Brazil 19Department of Physics, The Ohio State University, Columbus, OH 43210, USA 20Institut de F´ısica d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra (Barcelona) Spain 21Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA 22Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile 23Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT, UK 24Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa 25School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, Australia 26ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) 27LSST, 933 North Cherry Avenue, Tucson, AZ 85721, USA 2 28Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA 29CNRS, UMR 7095, Institut d’Astrophysique de Paris, F-75014, Paris, France 30Sorbonne Universit´es, UPMC Univ Paris 06, UMR 7095, Institut d’Astrophysique de Paris, F-75014, Paris, France 31Observat´orio Nacional, Rua Gal. Jos´eCristino 77, Rio de Janeiro, RJ - 20921-400, Brazil 32INAF - Osservatorio Astrofisico di Torino, Pino Torinese, Italy 33National Center for Supercomputing Applications, 1205 West Clark St., Urbana, IL 61801, USA 34Department of Astronomy, University of Illinois, 1002 W. Green Street, Urbana, IL 61801, USA 35Department of Physics, IIT Hyderabad, Kandi, Telangana 502285, India 36Excellence Cluster Universe, Boltzmannstr. 2, 85748 Garching, Germany 37Faculty of Physics, Ludwig-Maximilians-Universit¨at, Scheinerstr. 1, 81679 Munich, Germany 38Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA 39Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USA 40Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA 41Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA 42Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, 28049 Madrid, Spain 43Centre for Astrophysics & Supercomputing, Swinburne University of Technology, Victoria 3122, Australia 44Department of Physics, ETH Zurich, Wolfgang-Pauli-Strasse 16, CH-8093 Zurich, Switzerland 45Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195, USA 46Santa Cruz Institute for Particle Physics, Santa Cruz, CA 95064, USA 47Australian Astronomical Observatory, North Ryde, NSW 2113, Australia 48Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA 49Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia 50George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA 51Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA 52Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USA 53Instituci´oCatalana de Recerca i Estudis Avan¸cats, E-08010 Barcelona, Spain 54The Research School of Astronomy and Astrophysics, Australian National University, ACT 2601, Australia 55Department of Physics and Astronomy, Pevensey Building, University of Sussex, Brighton, BN1 9QH, UK 56Brookhaven National Laboratory, Bldg 510, Upton, NY 11973, USA 57School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK 58Instituto de F´ısica Gleb Wataghin, Universidade Estadual de Campinas, 13083-859, Campinas, SP, Brazil 59Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 60Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, Jiangshu 210008, China 61Institute for Astronomy, University of Edinburgh, Edinburgh EH9 3HJ, UK (Dated: August 4, 2017) We measure the clustering of DES Year 1 galaxies that are intended to be combined with weak lensing samples in order to produce precise cosmological constraints from the joint analysis of large- scale structure and lensing correlations. Two-point correlation functions are measured for a sample of 6.6 105 luminous red galaxies selected using the redMaGiC algorithm over an area of 1321 square degrees,⇥ in the redshift range 0.15 <z<0.9, split into five tomographic redshift bins. The sample has a mean redshift uncertainty of σz/(1+z)=0.017. We quantify and correct spurious correlations induced by spatially variable survey properties, testing their impact on the clustering measurements and covariance. We demonstrate the sample’s robustness by testing for stellar contamination, for potential biases that could arise from the systematic correction, and for the consistency between the two-point auto- and cross-correlation functions. We show that the corrections we apply have a significant impact on the resultant measurement of cosmological parameters, but that the results are robust against arbitrary choices in the correction method. We find the linear galaxy bias in each redshift bin in a fiducial cosmology to be b(z=0.24) = 1.40 0.08, b(z=0.38) = 1.61 0.05, b(z=0.53) = 1.60 0.04 for galaxies with luminosities L/L >0±.5, b(z=0.68) = 1.93 0±.05 for ⇤ L/L >1andb(z=0±.83) = 1.99 0.07 for L/L > 1.5, broadly consistent with expectations± for the ⇤ ⇤ redshift and luminosity dependence± of the bias of red galaxies. We show these measurements to be consistent with the linear bias obtained from tangential shear measurements. I. INTRODUCTION lapsed over-densities (dark matter halos; [1]), and the mass of the halo they reside in is known to correlate with Galaxies are a biased tracer of the matter density field.
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