Abstract
We define and characterize a sample of 1.3 million galaxies extracted from the first year of Dark Energy Survey data, optimized to measure baryon acoustic oscillations (BAO) in the presence of significant redshift uncertainties. The sample is dominated by luminous red galaxies located at redshifts z ≳ 0.6. We define the exact selection using colour and magnitude cuts that balance the need of high number densities and small photometric redshift uncertainties, using the corresponding forecasted BAO distance error as a figure-of-merit in the process. The typical photo z uncertainty varies from 2.3 per cent to 3.6 per cent (in units of 1+z) from z = 0.6 to 1, with number densities from 200 to 130 galaxies per deg2 in tomographic bins of width ∆z = 0.1. Next, we summarize the validation of the photometric redshift estimation. We characterize and mitigate observational systematics including stellar contamination and show that the clustering on large scales is robust in front of those contaminants. We show that the clustering signal in the autocorrelations and cross-correlations is generally consistent with theoretical models, which serve as an additional test of the redshift distributions.
| Original language | English |
|---|---|
| Pages (from-to) | 2807-2822 |
| Number of pages | 16 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Volume | 482 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 11 2019 |
Funding
This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, and Office of High Energy Physics. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. MC acknowledges support from the Spanish Ramon y Cajal MICINN program. MC and EG have been partially funded by AYA2015-71825. AJR is grateful for support from the Ohio State University Center for Cosmology and AstroParticle Physics. KCC acknowledges the support from the Spanish Ministerio de Econo-mia y Competitividad grant ESP2013-48274-C3-1-P and the Juan de la Cierva fellowship. This work has used CosmoHub, see Car-retero et al. (2017). CosmoHub has been developed by the Port d’Informació Científica (PIC), maintained through a collaboration of the Institut de Física d’Altes Energies (IFAE) and the Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) and was partially funded by the ‘Plan Estatal de Investi-gación Cientfica y Técnica y de Innovación’ program of the Spanish government. Funding for the DES Projects has been provided by the U.S.Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Sci- ence and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, 〈0:funding-source 〉Financiadora de Estudos e Projetos〈/0: funding-source〉, Fundac¸ão Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro,Conselho Nacional de Desen-volvimento Científico e Tecnológico and the Ministério da Ciência, Tecnologia e Inovac¸ão, the Deutsche Forschungsgemeinschaft, and the Collaborating Institutions in the DES. MC acknowledges support from the Spanish Ramon y Cajal MICINN program. MC and EG have been partially funded by AYA2015-71825. AJR is grateful for support from the Ohio State University Center for Cosmology and AstroParticle Physics. KCC acknowledges the support from the Spanish Ministerio de Econo-mia y Competitividad grant ESP2013-48274-C3-1-P and the Juan de la Cierva fellowship. This work has used CosmoHub, see Carretero et al. (2017). CosmoHub has been developed by the Port d'Informació Científica (PIC), maintained through a collaboration of the Institut de Física d'Altes Energies (IFAE) and the Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) and was partially funded by the 'Plan Estatal de Investi-gación Cientfica y Técnica y de Innovación' program of the Spanish government. We are grateful for the extraordinary contributions of our CTIO colleagues and the DECam Construction, Commissioning, and Science Verification teams in achieving the excellent instrument and telescope conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the DES Data Management group. Funding for the DES Projects has been provided by the U.S.Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and AstroParticle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, 0:funding-source Financiadora de Estudos e Projetos/0: funding-source, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro,Conselho Nacional de Desen-volvimento Científico e Tecnológico and the Ministério da Ciência, Tecnologia e Inovação, the Deutsche Forschungsgemeinschaft, and the Collaborating Institutions in the DES. The Collaborating Institutions are Argonne National Laboratory, the University of California at Santa Cruz, the University of Cambridge, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas-Madrid, the University of Chicago, University College London, the DES-Brazil Consortium, the University of Edinburgh, the Eidgenössische Technische Hochschule (ETH) Zürich, Fermi National Accelerator Laboratory, the University of Illinois at Urbana-Champaign, the Institut de Ciències de l'Espai (IEEC/CSIC), the Institut de Física d'Altes Energies, Lawrence Berkeley National Laboratory, the Ludwig-Maximilians Univer-sität München and the associated Excellence Cluster Universe, the University of Michigan, the National Optical Astronomy Observatory, the University of Nottingham, The Ohio State University, the University of Pennsylvania, the University of Portsmouth, SLAC National Accelerator Laboratory, Stanford University, the University of Sussex, Texas A&M University, and the OzDES Membership Consortium. Based in part on observations at Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. The DESDM is supported by the National Science Foundation under Grant Numbers AST-1138766 and AST-1536171. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2015-71825, ESP2015-66861, FPA2015-68048, SEV-2016-0588, SEV-2016-0597, and MDM-2015-0509, some of which include ERDF funds from the European Union. IFAE 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 240672, 291329, and 306478. We acknowledge support from the Australian Research Council Cen-tre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020. This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, and Office of High Energy Physics. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. This paper has gone through internal review by the DES collaboration. The DES publication number for this article is DES-2017-0305. The Fermilab pre-print number is FERMILAB-PUB-17-585. The DESDM is supported by the National Science Foundation under Grant Numbers AST-1138766 and AST-1536171. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2015-71825, ESP2015-66861, FPA2015-68048, SEV-2016-0588, SEV-2016-0597, and MDM-2015-0509, some of which include ERDF funds from the European Union. IFAE 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 240672, 291329, and 306478. We acknowledge support from the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020. Based in part on observations at Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation.
| Funders | Funder number |
|---|---|
| Australian Research Council Centre of Excellence for All-sky Astrophysics | CE110001020 |
| Conselho Nacional de Desen-volvimento Científico e Tecnológico | |
| European Union’s Seventh Framework Program | |
| FP7/2007 | |
| Fermi Research Alliance, LLC | DE-AC02-07CH11359 |
| Institut de Física d’Altes Energies | |
| Kavli Institute of Cosmological Physics at the University of Chicago | |
| Ministry of Science and Education of Spain | |
| Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University | |
| National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign | |
| Sci- ence and Technology Facilities Council of the United Kingdom | |
| Spanish Ramon y Cajal MICINN | |
| U.S. National Science Foundation | |
| U.S.Department of Energy | |
| National Science Foundation | AST-1138766, AST-1536171 |
| U.S. Department of Energy | |
| Office of Science | |
| High Energy Physics | |
| Ohio State University | |
| Higher Education Funding Council for England | |
| Center for Cosmology and Astroparticle Physics, Ohio State University | |
| European Commission | |
| European Research Council | 240672, 306478, 291329 |
| Deutsche Forschungsgemeinschaft | |
| Generalitat de Catalunya | |
| Ministerio de Economía y Competitividad | SEV-2016-0588, ESP2013-48274-C3-1-P, SEV-2016-0597, ESP2015-66861, MDM-2015-0509, FPA2015-68048, AYA2015-71825 |
| Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro | |
| Financiadora de Estudos e Projetos | |
| Ministerio de Ciencia e Innovación | |
| Ministério da Ciência e Tecnologia | |
| European Regional Development Fund | |
| Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas |
Keywords
- Cosmology: observations
- Large-scale structure of Universe