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Euclid: The importance of galaxy clustering and weak lensing cross-correlations within the photometric Euclid survey

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  • Additional Information
    • Contributors:
      Institut de recherche en astrophysique et planétologie (IRAP); Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3); Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP); Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS); Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)); Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7); 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); Centre National d'Études Spatiales [Toulouse] (CNES); Institut d'astrophysique spatiale (IAS); Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS); Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)); Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY); Département d'Astrophysique (ex SAP) (DAP); Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay; AstroParticule et Cosmologie (APC (UMR_7164)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP); Laboratoire d'Astrophysique de Marseille (LAM); Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS); Centre de Physique des Particules de Marseille (CPPM); Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS); Institut de Physique Nucléaire de Lyon (IPNL); Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL); Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3); EUCLID; Tutusaus, I.; Martinelli, M.; Cardone, V. F.; Camera, S.; Yahia-Cherif, S.; Casas, S.; Blanchard, A.; Kilbinger, M.; Lacasa, F.; Sakr, Z.; Ilic, S.; Kunz, M.; Carbone, C.; Castander, F. J.; Dournac, F.; Fosalba, P.; Kitching, T.; Markovic, K.; Mangilli, A.; Pettorino, V.; Sapone, D.; Yankelevich, V.; Auricchio, N.; Bender, R.; Bonino, D.; Boucaud, A.; Brescia, M.; Capobianco, V.; Carretero, J.; Castellano, M.; Cavuoti, S.; Cledassou, R.; Congedo, G.; Conversi, L.; Corcione, L.; Costille, A.; Crocce, M.; Cropper, M.; Dubath, F.; Dusini, S.; Fabbian, G.; Frailis, M.; Franceschi, E.; Garilli, B.; Grupp, F.; Guzzo, L.; Hoekstra, H.; Hormuth, F.; Israel, H.; Jahnke, K.; Kermiche, S.; Kubik, B.; Laureijs, R.; Ligori, S.; Lilje, P. B.; Lloro, I.; Maiorano, E.; Marggraf, O.; Massey, R.; Mei, S.; Merlin, E.; Meylan, G.; Moscardini, L.; Ntelis, P.; Padilla, C.; Paltani, S.; Pasian, F.; Percival, W. J.; Pires, S.; Poncet, M.; Raison, F.; Rhodes, J.; Roncarelli, M.; Rossetti, E.; Saglia, R.; Schneider, P.; Secroun, A.; Serrano, S.; Sirignano, C.; Sirri, G.; Starck, J.; Sureau, F.; Taylor, A. N.; Tereno, I.; Toledo-Moreo, R.; Valenziano, L.; Wang, Y.; Welikala, N.; Weller, J.; Zacchei, A.; Zoubian, J.; Tutusaus I.; Martinelli M.; Cardone V.F.; Camera S.; Yahia-Cherif S.; Casas S.; Blanchard A.; Kilbinger M.; Lacasa F.; Sakr Z.; Ilic S.; Kunz M.; Carbone C.; Castander F.J.; Dournac F.; Fosalba P.; Kitching T.; Markovic K.; Mangilli A.; Pettorino V.; Sapone D.; Yankelevich V.; Auricchio N.; Bender R.; Bonino D.; Boucaud A.; Brescia M.; Capobianco V.; Carretero J.; Castellano M.; Cavuoti S.; Cledassou R.; Congedo G.; Conversi L.; Corcione L.; Costille A.; Crocce M.; Cropper M.; Dubath F.; Dusini S.; Fabbian G.; Frailis M.; Franceschi E.; Garilli B.; Grupp F.; Guzzo L.; Hoekstra H.; Hormuth F.; Israel H.; Jahnke K.; Kermiche S.; Kubik B.; Laureijs R.; Ligori S.; Lilje P.B.; Lloro I.; Maiorano E.; Marggraf O.; Massey R.; Mei S.; Merlin E.; Meylan G.; Moscardini L.; Ntelis P.; Padilla C.; Paltani S.; Pasian F.; Percival W.J.; Pires S.; Poncet M.; Raison F.; Rhodes J.; Roncarelli M.; Rossetti E.; Saglia R.; Schneider P.; Secroun A.; Serrano S.; Sirignano C.; Sirri G.; Starck J.; Sureau F.; Taylor A.N.; Tereno I.; Toledo-Moreo R.; Valenziano L.; Wang Y.; Welikala N.; Weller J.; Zacchei A.; Zoubian J.; Ministerio de Ciencia, Innovación y Universidades (España); European Commission; Agencia Estatal de Investigación (España); Ministero dell'Istruzione, dell'Università e della Ricerca; Academy of Finland; Agenzia Spaziale Italiana; Belgian Science Policy Office; Canadian Euclid Consortium; German Centre for Air and Space Travel; Danish Space Research Institute; Fundação para a Ciência e a Tecnologia (Portugal); Ministerio de Economía y Competitividad (España); National Aeronautics and Space Administration (US); Romanian Space Agency; Netherlands Research School for Astronomy; Norwegian Space Agency; State Secretariat for Education, Research and Innovation (Switzerland); UK Space Agency; Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP); Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3); Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS); Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS); Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES); Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA); École normale supérieure - Paris (ENS-PSL); Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY); Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Université Claude Bernard Lyon 1 (UCBL); Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
    • Publication Information:
      arXiv, 2020.
    • Publication Date:
      2020
    • Abstract:
      [Context]The data from the Euclid mission will enable the measurement of the angular positions and weak lensing shapes of over a billion galaxies, with their photometric redshifts obtained together with ground-based observations. This large dataset, with well-controlled systematic effects, will allow for cosmological analyses using the angular clustering of galaxies (GCph) and cosmic shear (WL). For Euclid, these two cosmological probes will not be independent because they will probe the same volume of the Universe. The cross-correlation (XC) between these probes can tighten constraints and is therefore important to quantify their impact for Euclid.
      [Aims] In this study, we therefore extend the recently published Euclid forecasts by carefully quantifying the impact of XC not only on the final parameter constraints for different cosmological models, but also on the nuisance parameters. In particular, we aim to decipher the amount of additional information that XC can provide for parameters encoding systematic effects, such as galaxy bias, intrinsic alignments (IAs), and knowledge of the redshift distributions.
      [Methods] We follow the Fisher matrix formalism and make use of previously validated codes. We also investigate a different galaxy bias model, which was obtained from the Flagship simulation, and additional photometric-redshift uncertainties; we also elucidate the impact of including the XC terms on constraining these latter.
      [Results] Starting with a baseline model, we show that the XC terms reduce the uncertainties on galaxy bias by ∼17% and the uncertainties on IA by a factor of about four. The XC terms also help in constraining the γ parameter for minimal modified gravity models. Concerning galaxy bias, we observe that the role of the XC terms on the final parameter constraints is qualitatively the same irrespective of the specific galaxy-bias model used. For IA, we show that the XC terms can help in distinguishing between different models, and that if IA terms are neglected then this can lead to significant biases on the cosmological parameters. Finally, we show that the XC terms can lead to a better determination of the mean of the photometric galaxy distributions.
      [Conclusions] We find that the XC between GCph and WL within the Euclid survey is necessary to extract the full information content from the data in future analyses. These terms help in better constraining the cosmological model, and also lead to a better understanding of the systematic effects that contaminate these probes. Furthermore, we find that XC significantly helps in constraining the mean of the photometric-redshift distributions, but, at the same time, it requires more precise knowledge of this mean with respect to single probes in order not to degrade the final "figure of merit".
      Tutusaus acknowledges support from the Spanish Ministry of Science, Innovation and Universities through grant ESP2017-89838-C3-1-R, and the H2020 programme of the European Commission through grant 776247. M. Martinelli has received the support of a fellowship from “la Caixa” Foundation (ID 100010434), with fellowship code LCF/BQ/PI19/11690015, and the support of the Spanish Agen-cia Estatal de Investigacion through the grant “IFT Centro de Excelencia Severo Ochoa SEV-2016-0597”. S. Camera acknowledges support from the “Departments of Excellence 2018−2022” Grant awarded by the Italian Ministry of Education, University and Research (miur) L. 232/2016. S. Camera is supported by miur through Rita Levi Montalcini project “prometheus – Probing and Relating Observables with Multi-wavelength Experiments To Help Enlightening the Universe’s Structure”. F. Lacasa acknowledges support by the Swiss National Science Foundation. S. Ilić acknowledges financial support from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007–2013)/ERC Grant Agreement No. 617656 “Theories and Models of the Dark Sector: Dark Matter, Dark Energy and Gravity”. V. Yankelevich acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 769130). P. Ntelis is funded by “Centre National d’Études Spatiales” (CNES), for the Euclid project. The Euclid Consortium acknowledges the European Space Agency and the support of a number of agencies and institutes that have supported the development of Euclid, in particular the Academy of Finland, the Agenzia Spaziale Italiana, the Belgian Science Policy, the Canadian Euclid Consortium, the Centre National d’Etudes Spatiales, the Deutsches Zentrum für Luft-und Raumfahrt, the Danish Space Research Institute, the Fundação para a Ciência e a Tecnologia, the Ministerio de Economia y Compet-itividad, the National Aeronautics and Space Administration, the Netherlandse Onderzoekschool Voor Astronomie, the Norwegian Space Agency, the Romanian Space Agency, the State Secretariat for Education, Research and Innovation (SERI) at the Swiss Space Office (SSO), and the United Kingdom Space Agency. A detailed complete list is available on the Euclid website (http:// www.euclid-ec.org).
    • File Description:
      STAMPA; application/pdf
    • ISSN:
      0004-6361
    • Accession Number:
      10.48550/arxiv.2005.00055
    • Rights:
      OPEN
    • Accession Number:
      edsair.doi.dedup.....b9ffbae51ad493d3b1c81d6652290c64