Año de inicio
2012
Unidad organizativa
Institución organizadora
Subvenciones relacionadas:
General
Descripción
El Fondo Cósmico de Microondas (FCM) contiene la información estadística de las semillas primigenias que han dado lugar a la formación de todas las estructuras en el Universo. Su contrapartida natural en el Universo local es la distribución de las galaxias que surgen como resultado del crecimiento gravitatorio de aquellas fluctuaciones de densidad primigenias. La caracterización de la distribución de inhomogeneidades a gran escala en el Universo local proporciona una herramienta muy poderosa, y complementaria al FCM, para determinar el origen y el contenido energético del Universo, el ritmo de expansión del mismo durante la evolución cósmica, los detalles del proceso de formación de todas las estructuras a gran escala que observamos en el Universo hoy día. Esta es la página web del grupo de Cosmología con trazadores de la Estructura a Gran Escala (LSS de sus siglas en inglés), en el IAC.
Miembros
Investigador principal
FRANCISCO SHU
KITAURA JOYANES
Personal del proyecto
José Alberto
Rubiño Martín
Prof.
Rafael
Rebolo López
Juan E
Betancort Rijo
Martín
López Corredoira
Ricardo Tanausú
Genova Santos
Rafael Delfin
Barrena Delgado
Colaboradores
José Javier
Díaz García
Dr.
A. Hempel
Dr.
F. Atrio-Barandela
Dr.
S. Patiri
Dr.
A.J. Cuesta Vázquez
Dr.
A.D. Montero Dorta
Dr.
F. Prada
Dr.
M.A. Sánchez Conde
Dr.
S. Gottlaber
Dr.
A. Klypin
Dr.
Sylos-Labini
Dr.
C. Hernández-Monteagudo
Dr.
A. Pérez Garrido
Dr.
A. Díaz Sánchez
Dr.
I. Villo
Dr.
R. Toledo
Dr.
C. Zhao
Resultados
- eBOSS: análisis cosmológico de los datos de cuásares. Marcos Pellejero Ibañez and F. S. Kitaura participaron en la construcción de la likelihood y en el análisis de los parámetros cosmológicos (including as coauthors Kitaura & Pellejero Ibañez: 2018MNRAS.473.4773A).
- EUCLID: proyecto comparativo de códigos para generar catálogos de galaxias sintéticos, donde se demostró la precisión y eficiencia de PATCHY (including as coauthors Balaguera-Antolínez, Kitaura & Pellejero Ibañez: https://arxiv.org/abs/1806.09497, https://arxiv.org/abs/1806.09477, https://arxiv.org/abs/1806.09499)
- Desarrollo de un método para asignar el bias para estudios de estructura a gran escala (Balaguera-Antolínez, Kitaura, Pellejero Ibañez et al 2018: https://arxiv.org/abs/1806.05870)
- Presentación del proyecto UNITSIM para proporcionar modelos teóricos para comparar con observaciones DESI y EUCLID (including as coauthors Kitaura & Pellejero Ibañez:http://www.unitsims.org/ https://arxiv.org/abs/1811.02111)
- Presentación del código BARCODE (Bos, Kitaura & Weygaert 2018: https://arxiv.org/abs/1810.05189, http://adsabs.harvard.edu/abs/2018ascl.soft10002B)
Actividad científica
Publicaciones relacionadas
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A common explanation of the Hubble tension and anomalous cold spots in the CMBThe standard cosmological paradigm narrates a reassuring story of a universe currently dominated by an enigmatic dark energy component. Disquietingly, its universal explaining power has recently been challenged by, above all, the ∼4σ tension in the values of the Hubble constant. Another, less studied anomaly is the repeated observation ofKovács, A. et al.
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92020 -
Biases in galaxy cluster velocity dispersion and mass estimates in the small N<SUB>gal</SUB> regimeAims: We present a study of the statistical properties of three velocity dispersion and mass estimators: biweight, gapper, and standard deviation for a small number of galaxies (N gal ≤ 75). Methods: Using a set of 73 numerically simulated galaxy clusters, we first characterised the statistical bias and the variance for each one of the threeFerragamo, A. et al.
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92020 -
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62020 -
The bias of dark matter tracers: assessing the accuracy of mapping techniquesWe present a comparison between approximated methods for the construction of mock catalogues based on the halo-bias mapping technique. To this end, we use as reference a high-resolution N-body simulation of 3840 3 dark matter particles on a 400 h -1 Mpc cube box from the Multidark suite. In particular, we explore parametric versus non-parametricPellejero-Ibañez, Marcos et al.
Fecha de publicación:
32020 -
One simulation to have them all: performance of the Bias Assignment Method against N-body simulationsIn this paper, we demonstrate that the information encoded in one single (sufficiently large) N-body simulation can be used to reproduce arbitrary numbers of halo catalogues, using approximated realizations of dark matter density fields with different initial conditions. To this end, we use as a reference one realization (from an ensemble of 300)Balaguera-Antolínez, A. et al.
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12020 -
Euclid preparation. V. Predicted yield of redshift 7 < z < 9 quasars from the wide surveyWe provide predictions of the yield of 7 < z < 9 quasars from the Euclid wide survey, updating the calculation presented in the Euclid Red Book in several ways. We account for revisions to the Euclid near-infrared filter wavelengths; we adopt steeper rates of decline of the quasar luminosity function (QLF; Φ) with redshift, Φ ∝ 10 k(z - 6), k = -0Euclid Collaboration et al.
Fecha de publicación:
112019 -
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12020 -
Optical validation and characterization of Planck PSZ2 sources at the Canary Islands observatories. II. Second year of LP15 observationsContext. The second legacy catalog of Planck Sunyaev-Zeldovich (SZ) sources, hereafter PSZ2, provides the largest galaxy cluster sample selected by means of the SZ signature of the clusters in a full sky survey. In order to fully characterize this PSZ2 sample for cosmological studies, all the members should be validated and the physical propertiesAguado-Barahona, A. et al.
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112019 -
Dark Energy Survey year 1 results: the relationship between mass and light around cosmic voidsWhat are the mass and galaxy profiles of cosmic voids? In this paper, we use two methods to extract voids in the Dark Energy Survey (DES) Year 1 redMaGiC galaxy sample to address this question. We use either 2D slices in projection, or the 3D distribution of galaxies based on photometric redshifts to identify voids. For the mass profile, we measureFang, Y. et al.
Fecha de publicación:
122019 -
All-sky angular power spectra from cleaned WISE×SuperCOSMOS galaxy number countsAiming to extract cosmological information from linear scales of the WISE×SuperCOSMOS photometric redshift catalog, we perform a characterization of the systematic effects associated with stellar content, evidencing the presence of contamination and obscuration. We create an integrated model for these effects (which together we call "usurperXavier, H. S. et al.
Fecha de publicación:
82019 -
Optical validation and characterization of Planck PSZ2 sources at the Canary Islands observatories. I. First year of LP15 observationsAims: The second catalogue of Planck Sunyaev-Zeldovich (SZ) sources, hereafter PSZ2, is the largest sample of galaxy clusters selected through their SZ signature in the full sky. At the time of publication, 21% of these objects had no known counterpart at other wavelengths. Using telescopes at the Canary Island observatories, we conducted the longStreblyanska, A. et al.
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82019 -
Bayesian cosmic density field inference from redshift space dark matter mapsWe present a self-consistent Bayesian formalism to sample the primordial density fields compatible with a set of dark matter density tracers after a cosmic evolution observed in redshift space. Previous works on density reconstruction did not self-consistently consider redshift space distortions or included an additional iterative distortionBos, E. G. Patrick et al.
Fecha de publicación:
92019 -
UNIT project: Universe N-body simulations for the Investigation of Theoretical models from galaxy surveysWe present the UNIT N-body cosmological simulations project, designed to provide precise predictions for non-linear statistics of the galaxy distribution. We focus on characterizing statistics relevant to emission line and luminous red galaxies in the current and upcoming generation of galaxy surveys. We use a suite of precise particle meshChuang, Chia-Hsun et al.
Fecha de publicación:
72019 -
Optical Identifications of Galaxy Clusters Among Objects from the Second Planck Catalogue of Sunyaev-Zeldovich SourcesWe present the results of optical identifications and spectroscopic redshift measurements for galaxy clusters from the second Planck catalogue of Sunyaev-Zeldovich sources. We used the data of observations with the 1.5-m Russian-Turkish telescope (RTT150), the 1.6-m Sayan Observatory AZT-33IK telescope, the 3.5-m Calar Alto telescope, and the 6-mZaznobin, I. A. et al.
Fecha de publicación:
22019 -
Clustering properties of TGSS radio sourcesWe investigate the clustering properties of radio sources in the Alternative Data Release 1 of the TIFR GMRT Sky Survey (TGSS), focusing on large angular scales, where previous analyses have detected a large clustering signal. After appropriate data selection, the TGSS sample we use contains ˜110 000 sources selected at 150 MHz over ˜70% of the skyDolfi, A. et al.
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32019 -
Comparing approximate methods for mock catalogues and covariance matrices II: power spectrum multipolesWe study the accuracy of several approximate methods for gravitational dynamics in terms of halo power spectrum multipoles and their estimated covariance matrix. We propagate the differences in covariances into parameter constraints related to growth rate of structure, Alcock-Paczynski distortions, and biasing. We consider seven methods in threeBlot, L. et al.
Fecha de publicación:
52019 -
More out of less: an excess integrated Sachs-Wolfe signal from supervoids mapped out by the Dark Energy SurveyThe largest structures in the cosmic web probe the dynamical nature of dark energy through their integrated Sachs-Wolfe imprints. In the strength of the signal, typical cosmic voids have shown good consistency with expectation AISW = ΔTdata/ΔTtheory = 1, given the substantial cosmic variance. Discordantly, large-scale hills in the gravitationalKovács, A. et al.
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42019 -
Comparing approximate methods for mock catalogues and covariance matrices - I. Correlation functionThis paper is the first in a set that analyses the covariance matrices of clustering statistics obtained from several approximate methods for gravitational structure formation. We focus here on the covariance matrices of anisotropic two-point correlation function measurements. Our comparison includes seven approximate methods, which can be dividedLippich, M. et al.
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12019 -
Comparing approximate methods for mock catalogues and covariance matrices - III: bispectrumWe compare the measurements of the bispectrum and the estimate of its covariance obtained from a set of different methods for the efficient generation of approximate dark matter halo catalogues to the same quantities obtained from full N-body simulations. To this purpose we employ a large set of 300 realizations of the same cosmology for eachColavincenzo, Manuel et al.
Fecha de publicación:
22019 -
BAM: bias assignment method to generate mock cataloguesWe present BAM: a novel Bias Assignment Method envisaged to generate mock catalogues. Combining the statistics of dark matter tracers from a high-resolution cosmological N-body simulation and the dark matter density field calculated from down-sampled initial conditions using efficient structure formation solvers, we extract the halo-bias relationBalaguera-Antolínez, A. et al.
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22019
Charlas relacionadas
No se han encontrado charlas relacionadas.Congresos relacionados
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