Search

Your search keyword '"Cerro Tololo Interamer Observ"' showing total 3 results
Start Over Author "Cerro Tololo Interamer Observ" Topic cosmic microwave background
3 results on '"Cerro Tololo Interamer Observ"'

1. DES Y1 results: Splitting growth and geometry to test $\Lambda$CDM

Author

Muir, J., Baxter, E., Miranda, V, Doux, C., Ferte, A., Leonard, C. D., Huterer, D., Jain, B., Lemos, P., Raveri, M., Nadathur, S., Campos, A. [UNESP], Chen, A., Dodelson, S., Elvin-Poole, J., Lee, S., Secco, L. F., Troxel, M. A., Weaverdyck, N., Zuntz, J., Brout, D., Choi, A., Crocce, M., Davis, T. M., Gruen, D., Krause, E., Lidman, C., MacCrann, N., Moller, A., Prat, J., Ross, A. J., Sako, M., Samuroff, S., Sanchez, C., Scolnic, D., Zhang, B., Abbott, T. M. C., Aguena, M., Allam, S., Annis, J., Avila, S., Bacon, D., Bertin, E., Bhargava, S., Bridle, S. L., Brooks, D., Burke, D. L., Carnero Rosell, A., Kind, M. Carrasco, Carretero, J., Cawthon, R., Costanzi, M., Costa, L. N. da, Pereira, M. E. S., Desai, S., Diehl, H. T., Dietrich, J. P., Doel, P., Estrada, J., Everett, S., Evrard, A. E., Ferrero, I, Flaugher, B., Frieman, J., Garcia-Bellido, J., Giannantonio, T., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., Hoyle, B., James, D. J., Jeltema, T., Kuehn, K., Kuropatkin, N., Lahav, O., Lima, M., Maia, M. A. G., Menanteau, F., Miquel, R., Morgan, R., Myles, J., Palmese, A., Paz-Chinchon, F., Plazas, A. A., Romer, A. K., Roodman, A., Sanchez, E., Scarpine, V, Serrano, S., Sevilla-Noarbe, I, Smith, M., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., To, C., Tucker, D. L., Varga, T. N., Weller, J., Wilkinson, R. D., DES Collaboration, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), 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), DES, National Science Foundation (US), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Generalitat de Catalunya, Instituto Nacional de Ciência e Tecnologia (Brasil), Stanford University, University of Hawaii, University of Arizona, University of Pennsylvania, California Institute of Technology, Newcastle University, University of Michigan, University College London, University of Chicago, University of Portsmouth, Carnegie Mellon University, Universidade Estadual Paulista (UNESP), Ohio State University, Duke University, University of Edinburgh, Harvard and Smithsonian, Institut d'Estudis Espacials de Catalunya (IEEC), Institute of Space Sciences (ICE-CSIC, University of Queensland, 382 Via Pueblo Mall, SLAC National Accelerator Laboratory, Australian National University, LPC, NSF's National Optical-Infrared Astronomy Research Laboratory, Universidade de São Paulo (USP), Laboratório Interinstitucional de E-Astronomia-LIneA, Fermi National Accelerator Laboratory, Universidad Autonoma de Madrid, Institut d'Astrophysique de Paris, University of Sussex, University of Manchester, Instituto de Astrofisica de Canarias, Universidad de la Laguna, University of Illinois at Urbana-Champaign, National Center for Supercomputing Applications, Barcelona Institute of Science and Technology, University of Wisconsin-Madison, INAF-Osservatorio Astronomico di Trieste, Institute for Fundamental Physics of the Universe, Observatório Nacional, IIT Hyderabad, Ludwig-Maximilians-Universität, Santa Cruz Institute for Particle Physics, University of Oslo, University of Cambridge, Max Planck Institute for Extraterrestrial Physics, Ludwig-Maximilians Universität München, Center for Astrophysics | Harvard and Smithsonian, Macquarie University, Lowell Observatory, Institució Catalana de Recerca i Estudis Avançats, Peyton Hall, Medioambientales y Tecnológicas (CIEMAT), University of Southampton, Oak Ridge National Laboratory, Stanford Univ, Univ Hawaii, Univ Arizona, Univ Penn, CALTECH, Newcastle Univ, Univ Michigan, UCL, Univ Chicago, Univ Portsmouth, Carnegie Mellon Univ, Universidade Estadual Paulista (Unesp), Ohio State Univ, Duke Univ, Univ Edinburgh, Harvard & Smithsonian, Inst Estudis Espacials Catalunya IEEC, CSIC, Univ Queensland, SLAC Natl Accelerator Lab, Australian Natl Univ, Univ Clermont Auvergne, Cerro Tololo Interamer Observ, Lab Interinst E Astron LIneA, Fermilab Natl Accelerator Lab, Univ Autonoma Madrid, Inst Astrophys Paris, Sorbonne Univ, Univ Sussex, Univ Manchester, Inst Astrofis Canarias, Univ La Laguna, Univ Illinois, Natl Ctr Supercomp Applicat, Barcelona Inst Sci & Technol, Univ Wisconsin, INAF Osservatorio Astron Trieste, Inst Fundamental Phys Universe, Observ Nacl, Ludwig Maximilians Univ Munchen, Santa Cruz Inst Particle Phys, Univ Oslo, Univ Cambridge, Max Planck Inst Extraterr Phys, Macquarie Univ, Lowell Observ, Inst Catalana Recerca & Estudis Avancats, Princeton Univ, Ctr Invest Energet Medioambientales & Tecnol CIEM, Univ Southampton, Oak Ridge Natl Lab, UAM. Departamento de Física Teórica, Muir, J., Baxter, E., Miranda, V., Doux, C., Ferte, A., Leonard, C. D., Huterer, D., Jain, B., Lemos, P., Raveri, M., Nadathur, S., Campos, A., Chen, A., Dodelson, S., Elvin-Poole, J., Lee, S., Secco, L. F., Troxel, M. A., Weaverdyck, N., Zuntz, J., Brout, D., Choi, A., Crocce, M., Davis, T. M., Gruen, D., Krause, E., Lidman, C., Maccrann, N., Moller, A., Prat, J., Ross, A. J., Sako, M., Samuroff, S., Sanchez, C., Scolnic, D., Zhang, B., Abbott, T. M. C., Aguena, M., Allam, S., Annis, J., Avila, S., Bacon, D., Bertin, E., Bhargava, S., Bridle, S. L., Brooks, D., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Cawthon, R., Costanzi, M., Da Costa, L. N., Pereira, M. E. S., Desai, S., Diehl, H. T., Dietrich, J. P., Doel, P., Estrada, J., Everett, S., Evrard, A. E., Ferrero, I., Flaugher, B., Frieman, J., Garcia-Bellido, J., Giannantonio, T., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., Hoyle, B., James, D. J., Jeltema, T., Kuehn, K., Kuropatkin, N., Lahav, O., Lima, M., Maia, M. A. G., Menanteau, F., Miquel, R., Morgan, R., Myles, J., Palmese, A., Paz-Chinchon, F., Plazas, A. A., Romer, A. K., Roodman, A., Sanchez, E., Scarpine, V., Serrano, S., Sevilla-Noarbe, I., Smith, M., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., To, C., Tucker, D. L., Varga, T. N., Weller, J., and Wilkinson, R. D.

Subjects
General relativity, Cosmological parameters, Geometry, Astrophysics::Cosmology and Extragalactic Astrophysics, Lambda, Sky surveys, 01 natural sciences, Omega, Evolution of the Universe, Cosmology, Cosmic microwave background, Cosmologial constant, symbols.namesake, 0103 physical sciences, Dark energy, RADIAÇÃO DE FUNDO, Astrophysical studies of gravity, Weak, Large-scale structure of the Universe, Planck, 010306 general physics, Weak gravitational lensing, Gravitational Lensing, Physics, 010308 nuclear & particles physics, Física, symbols, Neutrino, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Muir, J., et al. (DES Collaboration), We analyze Dark Energy Survey (DES) data to constrain a cosmological model where a subset of parameters - focusing on ωm - are split into versions associated with structure growth (e.g., ωmgrow) and expansion history (e.g., ωmgeo). Once the parameters have been specified for the ΛCDM cosmological model, which includes general relativity as a theory of gravity, it uniquely predicts the evolution of both geometry (distances) and the growth of structure over cosmic time. Any inconsistency between measurements of geometry and growth could therefore indicate a breakdown of that model. Our growth-geometry split approach therefore serves both as a (largely) model-independent test for beyond-ΛCDM physics, and as a means to characterize how DES observables provide cosmological information. We analyze the same multiprobe DES data as [Phys. Rev. Lett. 122, 171301 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.171301]: DES Year 1 (Y1) galaxy clustering and weak lensing, which are sensitive to both growth and geometry, as well as Y1 BAO and Y3 supernovae, which probe geometry. We additionally include external geometric information from BOSS DR12 BAO and a compressed Planck 2015 likelihood, and external growth information from BOSS DR12 RSD. We find no significant disagreement with ωmgrow=ωmgeo. When DES and external data are analyzed separately, degeneracies with neutrino mass and intrinsic alignments limit our ability to measure ωmgrow, but combining DES with external data allows us to constrain both growth and geometric quantities. We also consider a parametrization where we split both ωm and w, but find that even our most constraining data combination is unable to separately constrain ωmgrow and wgrow. Relative to ΛCDM, splitting growth and geometry weakens bounds on σ8 but does not alter constraints on h., The DES data management system is supported by the National Science Foundation under Grants No. AST-1138766 and No. AST-1536171. The DES participants from Spanish institutions are partially supported by MICINN under Grants No. ESP2017-89838, No. PGC2018-094773, No. PGC2018-102021, No. SEV-2016-0588, No. SEV-2016-0597, and No. MDM-2015-0509, some of which include ERDF funds from the European Union. I. F. A. E. is partially funded by the CERCA program of the Generalitat de Catalunya. Research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP7/2007-2013) including ERC grant agreements No. 240672, No. 291329, and No. 306478. We acknowledge support from the Brazilian Instituto Nacional de Ciência e Tecnologia (INCT) do e-Universo (CNPq Grant No. 465376/2014-2).

Published
2021
Full Text
View/download PDF

2. Imprint of DES superstructures on the cosmic microwave background

Author

Tommaso Giannantonio, Juan Garcia-Bellido, J. Carretero, Daniel A. Goldstein, E. J. Sanchez, B. Flaugher, Enrique Gaztanaga, Peter Melchior, Shantanu Desai, Jennifer L. Marshall, Tim Eifler, F. B. Abdalla, Scott Dodelson, Kyler Kuehn, Ricardo L. C. Ogando, Carlos E. Cunha, Joshua A. Frieman, G. Gutierrez, M. E. C. Swanson, Seshadri Nadathur, J. Annis, A. Benoit-Lévy, Joseph Clampitt, I. Sevilla-Noarbe, David J. James, Dragan Huterer, A. K. Romer, Daniel Gruen, N. Kuropatkin, Bhuvnesh Jain, L. N. da Costa, E. Bertin, D. A. Finley, M. Carrasco Kind, Robert Crittenden, V. Scarpine, Pablo Fosalba, B. Soergel, E. Suchyta, Daniel Thomas, Flavia Sobreira, Krishna Naidoo, E. Buckley-Geer, L. Whiteway, Joseph DeRose, Brian Nord, David Bacon, Ofer Lahav, D. Brooks, Donnacha Kirk, Alistair R. Walker, John A. Peacock, C. B. D'Andrea, A. A. Plazas, Felipe Menanteau, Gregory Tarle, A. Carnero Rosell, Attila Kovács, Ramon Miquel, C. Sánchez, Darren L. DePoy, S. Allam, Robert A. Gruendl, 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), DES, Barcelona Inst Sci & Technol, Univ Autonoma Madrid, Univ Portsmouth, Kavli Inst Particle Astrophys & Cosmol, SLAC Natl Accelerator Lab, Univ Michigan, Univ Pennsylvania, Stanford Univ, Fermilab Natl Accelerator Lab, Univ Chicago, Inst Ciencies Espai, UCL, Inst Catalana Recerca Estudis Avanc, Univ Edinburgh, Univ Cambridge, Rhodes Univ, Inst Astrophys Paris, Sorbonne Univ, Laboratorio Interinstituc Astron LIneA, Observatorio Nacl, Univ Illinois, Natl Ctr Supercomp Applicat, Univ Southampton, Texas A&M Univ, Excellence Cluster Univ, Ludwig Maximilians Univ Munchen, CALTECH, Univ Calif, Lawrence Berkeley Natl Lab, Cerro Tololo Interamer Observ, Australian Astron Observ, Carnegie Observatories, Princeton Univ, Univ Sussex, Centro Investigac Energeticas Medioambient Tecnol, Universidade Estadual Paulista (Unesp), Institut d'Astrophysique de Paris ( IAP ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cold dark matter, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], media_common.quotation_subject, Cosmic microwave background, Cosmic background radiation, FOS: Physical sciences, Astrophysics, cosmic background radiation, 01 natural sciences, surveys, 0103 physical sciences, Anisotropy, 010303 astronomy & astrophysics, STFC, QB, media_common, Physics, Superstructure, 010308 nuclear & particles physics, RCUK, Astronomy and Astrophysics, Redshift, Space and Planetary Science, Sky, Dark energy, astro-ph.CO, large-scale structure of Universe, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Small temperature anisotropies in the Cosmic Microwave Background can be sourced by density perturbations via the late-time integrated Sachs-Wolfe effect. Large voids and superclusters are excellent environments to make a localized measurement of this tiny imprint. In some cases excess signals have been reported. We probed these claims with an independent data set, using the first year data of the Dark Energy Survey in a different footprint, and using a different super-structure finding strategy. We identified 52 large voids and 102 superclusters at redshifts $0.2 < z < 0.65$. We used the Jubilee simulation to a priori evaluate the optimal ISW measurement configuration for our compensated top-hat filtering technique, and then performed a stacking measurement of the CMB temperature field based on the DES data. For optimal configurations, we detected a cumulative cold imprint of voids with $\Delta T_{f} \approx -5.0\pm3.7~\mu K$ and a hot imprint of superclusters $\Delta T_{f} \approx 5.1\pm3.2~\mu K$ ; this is $\sim1.2\sigma$ higher than the expected $|\Delta T_{f}| \approx 0.6~\mu K$ imprint of such super-structures in $\Lambda$CDM. If we instead use an a posteriori selected filter size ($R/R_{v}=0.6$), we can find a temperature decrement as large as $\Delta T_{f} \approx -9.8\pm4.7~\mu K$ for voids, which is $\sim2\sigma$ above $\Lambda$CDM expectations and is comparable to previous measurements made using SDSS super-structure data., Comment: 16 pages, 12 figures. Accepted for publication by MNRAS without further review. Author list updated

Published
2016
Full Text
View/download PDF

3. Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing

Author

Abbott, T. M. C., Abdalla, F. B., Alarcon, A., Aleksic, J., Allam, S., Allen, S., Amara, A., Annis, J., Asorey, J., Avila, S., Bacon, D., Balbinot, E., Banerji, M., Banik, N., Barkhouse, W., Baumer, M., Baxter, E., Bechtol, K., Becker, M. R., Benoit-Levy, A., Benson, B. A., Bernstein, G. M., Bertin, E., Blazek, J., Bridle, S. L., Brooks, D., Brout, D., Buckley-Geer, E., Burke, D. L., Busha, M. T., Campos, A. [UNESP], Capozzi, D., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., Castander, F. J., Cawthon, R., Chang, C., Chen, N., Childress, M., Choi, A., Conselice, C., Crittenden, R., Crocce, M., Cunha, C. E., D'Andrea, C. B., Costa, L. N. da, Das, R., Davis, T. M., Davis, C., De Vicente, J., DePoy, D. L., DeRose, J., Desai, S., Diehl, H. T., Dietrich, J. P., Dodelson, S., Doel, P., Drlica-Wagner, A., Eifler, T. F., Elliott, A. E., Elsner, F., Elvin-Poole, J., Estrada, J., Evrard, A. E., Fang, Y., Fernandez, E., Ferte, A., Finley, D. A., Flaugher, B., Fosalba, P., Friedrich, O., Frieman, J., Garcia-Bellido, J., Garcia-Fernandez, M., Gatti, M., Gaztanaga, E., Gerdes, D. W., Giannantonio, T., Gill, M. S. S., Glazebrook, K., Goldstein, D. A., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hamilton, S., Hartley, W. G., Hinton, S. R., Honscheid, K., Hoyle, B., Huterer, D., Jain, B., James, D. J., Jarvis, M., Jeltema, T., Johnson, M. D., Johnson, M. W. G., Kacprzak, T., Kent, S., Kim, A. G., King, A., Kirk, D., Kokron, N., Kovacs, A., Krause, E., Krawiec, C., Kremin, A., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lacasa, F. [UNESP], Lahav, O., Li, T. S., Liddle, A. R., Lidman, C., Lima, M., Lin, H., MacCrann, N., Maia, M. A. G., Makler, M., Manera, M., March, M., Marshall, J. L., Martini, P., McMahon, R. G., Melchior, P., Menanteau, F., Miquel, R., Miranda, V., Mudd, D., Muir, J., Moller, A., Neilsen, E., Nichol, R. C., Nord, B., Nugent, P., Ogando, R. L. C., Palmese, A., Peacock, J., Peiris, H. V., Peoples, J., Percival, W. J., Petravick, D., Plazas, A. A., Porredon, A., Prat, J., Pujol, A., Rau, M. M., Refregier, A., Ricker, P. M., Roe, N., Rollins, R. P., Romer, A. K., Roodman, A., Rosenfeld, R. [UNESP], Ross, A. J., Rozo, E., Rykoff, E. S., Sako, M., Salvador, A. I., Samuroff, S., Sanchez, C., Sanchez, E., Santiago, B., Scarpine, V., Schindler, R., Scolnic, D., Secco, L. F., Serrano, S., Sevilla-Noarbe, I., Sheldon, E., Smith, R. C., Smith, M., Smith, J., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., Thomas, D., Troxel, M. A., Tucker, D. L., Tucker, B. E., Uddin, S. A., Varga, T. N., Vielzeuf, P., Vikram, V., Vivas, A. K., Walker, A. R., Wang, M., Wechsler, R. H., Weller, J., Wester, W., Wolf, R. C., Yanny, B., Yuan, F., Zenteno, A., Zhang, B., Zhang, Y., Zuntz, J., Dark Energy Survey Collaboration, 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), DES, National Optical Astronomy Observatory, Rhodes University, University College London, IEEC-CSIC, Barcelona Institute of Science and Technology, Fermi National Accelerator Laboratory, Stanford University, ETH Zurich, University of Queensland, ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), University of Portsmouth, Universidad Autonoma de Madrid, University of Surrey, University of Cambridge, Witmer Hall, SLAC National Accelerator Laboratory, University of Pennsylvania, LSST, Institut d'Astrophysique de Paris, University of Chicago, Observatoire de Sauverny, Ohio State University, University of Manchester, Universidade Estadual Paulista (UNESP), Laboratório Interinstitucional de E-Astronomia - LIneA, Observatório Nacional, National Center for Supercomputing Applications, University of Illinois, University of Southampton, School of Physics and Astronomy, University of Michigan, Medioambientales y Tecnológicas (CIEMAT), Texas A and M University, IIT Hyderabad, Excellence Cluster Universe, Ludwig-Maximilians-Universität, California Institute of Technology, University of Edinburgh, Ludwig-Maximilians Universität München, Max Planck Institute for Extraterrestrial Physics, Swinburne University of Technology, 501 Campbell Hall, Lawrence Berkeley National Laboratory, University of Washington, Santa Cruz Institute for Particle Physics, Universidade de São Paulo (USP), Australian Astronomical Observatory, Argonne National Laboratory, Centro Brasileiro de Pesquisas Físicas, Peyton Hall, Institució Catalana de Recerca i Estudis Avançats, Australian National University, University of Sussex, University of Arizona, UFRGS, Brookhaven National Laboratory, Dept. Physics-Astronomy, Universidade Estadual de Campinas (UNICAMP), Oak Ridge National Laboratory, Chinese Academy of Sciences, Cerro Tololo Interamer Observ, Rhodes Univ, UCL, CSIC, Barcelona Inst Sci & Technol, Fermilab Natl Accelerator Lab, Stanford Univ, Swiss Fed Inst Technol, Univ Queensland, ARC Ctr Excellence All Sky Astrophys CAASTRO, Univ Portsmouth, UAM, Univ Surrey, Univ Cambridge, Univ North Dakota, SLAC Natl Accelerator Lab, Univ Penn, CNRS, UPMC Univ Paris 06, Univ Chicago, EPFL, Ohio State Univ, Univ Manchester, Universidade Estadual Paulista (Unesp), Lab Interinst Astron LIneA, Observ Nacl, Natl Ctr Supercomp Applicat, Univ Illinois, Univ Southampton, Univ Nottingham, Univ Michigan, Ctr Invest Energet Medioambient & Tecnol CIEMAT, Texas A&M Univ, Ludwig Maximilians Univ Munchen, CALTECH, Univ Edinburgh, Max Planck Inst Extraterr Phys, Swinburne Univ Technol, Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Univ Washington, Santa Cruz Inst Particle Phys, Australian Astron Observ, Argonne Natl Lab, Ctrt Brasileiro Pesquisas Fisicas, Princeton Univ, Inst Catalana Recerca & Estudis Avancats, Australian Natl Univ, Univ Sussex, Univ Arizona, Univ Fed Rio Grande do Sul, Brookhaven Natl Lab, Austin Peay State Univ, Oak Ridge Natl Lab, and Chinese Acad Sci

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cosmic microwave background, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Cosmology, symbols.namesake, 0103 physical sciences, Planck, 010303 astronomy & astrophysics, Weak gravitational lensing, STFC, ResearchInstitutes_Networks_Beacons/MERI, QC, Physics, 010308 nuclear & particles physics, Astronomy, RCUK, Manchester Environmental Research Institute, Redshift, Galaxy, symbols, Dark energy, Neutrino, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present cosmological results from a combined analysis of galaxy clustering and weak gravitational lensing, using 1321 deg$^2$ of $griz$ imaging data from the first year of the Dark Energy Survey (DES Y1). We combine three two-point functions: (i) the cosmic shear correlation function of 26 million source galaxies in four redshift bins, (ii) the galaxy angular autocorrelation function of 650,000 luminous red galaxies in five redshift bins, and (iii) the galaxy-shear cross-correlation of luminous red galaxy positions and source galaxy shears. To demonstrate the robustness of these results, we use independent pairs of galaxy shape, photometric redshift estimation and validation, and likelihood analysis pipelines. To prevent confirmation bias, the bulk of the analysis was carried out while blind to the true results; we describe an extensive suite of systematics checks performed and passed during this blinded phase. The data are modeled in flat $\Lambda$CDM and $w$CDM cosmologies, marginalizing over 20 nuisance parameters, varying 6 (for $\Lambda$CDM) or 7 (for $w$CDM) cosmological parameters including the neutrino mass density and including the 457 $\times$ 457 element analytic covariance matrix. We find consistent cosmological results from these three two-point functions, and from their combination obtain $S_8 \equiv \sigma_8 (\Omega_m/0.3)^{0.5} = 0.783^{+0.021}_{-0.025}$ and $\Omega_m = 0.264^{+0.032}_{-0.019}$ for $\Lambda$CDM for $w$CDM, we find $S_8 = 0.794^{+0.029}_{-0.027}$, $\Omega_m = 0.279^{+0.043}_{-0.022}$, and $w=-0.80^{+0.20}_{-0.22}$ at 68% CL. The precision of these DES Y1 results rivals that from the Planck cosmic microwave background measurements, allowing a comparison of structure in the very early and late Universe on equal terms. Although the DES Y1 best-fit values for $S_8$ and $\Omega_m$ are lower than the central values from Planck ..., Comment: Matches published version. Results essentially unchanged, except updated covariance matrix leads to improved chi^2 (colored text removed)

Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results