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Your search keyword '"Galaxies: haloe"' showing total 3 results
Start Over Descriptor "Galaxies: haloe" Publisher hal ccsd
3 results on '"Galaxies: haloe"'

1. Fast Weak Lensing Simulations with Halo Model

Author

Sandra Di Meo, Lauro Moscardini, Sylvain de la Torre, Massimo Meneghetti, Pasquale Mazzotta, R. Benton Metcalf, Marco Baldi, Carlo Giocoli, Eric Jullo, 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), Università degli Studi di Roma Tor Vergata [Roma], INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), Alma Mater Studiorum University of Bologna (UNIBO), Università Politecnica delle Marche [Ancona] (UNIVPM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Giocoli, Carlo, Meo, Sandra Di, Meneghetti, Massimo, Jullo, Eric, de la Torre, Sylvain, Moscardini, Lauro, Baldi, Marco, Mazzotta, Pasquale, and R. Benton, Metcalf

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Strong gravitational lensing, Population, Dark matter, Gravitational lensing formalism, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Settore FIS/05 - Astronomia e Astrofisica, Gravitational lensing: weak, 0103 physical sciences, Statistical physics, education, Galaxies: haloe, 010303 astronomy & astrophysics, Weak gravitational lensing, Physics, education.field_of_study, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astronomy and Astrophysic, Redshift, Methods: analytic, Gravitational lens, Space and Planetary Science, Halo, Cosmology: theory, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Full ray-tracing maps of gravitational lensing, constructed from N-Body simulations, represent a fundamental tool to interpret present and future weak lensing data. However the limitation of computational resources and storage capabilities severely restrict the number of realizations that can be performed in order to accurately sample both the cosmic shear models and covariance matrices. In this paper we present a halo model formalism for weak gravitational lensing that alleviates these issues by producing weak-lensing mocks at a reduced computational cost. Our model takes as input the halo population within a desired light-cone and the linear power spectrum of the underlined cosmological model. We examine the contribution given by the presence of substructures within haloes to the cosmic shear power spectrum and quantify it to the percent level. Our method allows us to reconstruct high-resolution convergence maps, for any desired source redshifts, of light-cones that realistically trace the matter density distribution in the universe, account for masked area and sample selections. We compare our analysis on the same large scale structures constructed using ray-tracing techniques and find very good agreements both in the linear and non-linear regimes up to few percent levels. The accuracy and speed of our method demonstrate the potential of our halo model for weak lensing statistics and the possibility to generate a large sample of convergence maps for different cosmological models as needed for the analysis of large galaxy redshift surveys., 17 pages, 15 figures, accepted for publication in MNRAS

Published
2017

2. The universality of the virial halo mass function and models for non-universality of other halo definitions

Author

Giuseppe Tormen, Ravi K. Sheth, Carlo Giocoli, Raul E. Angulo, Giulia Despali, Giacomo Baso, Lauro Moscardini, 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), Despali, Giulia, Giocoli, Carlo, Angulo, Raul E., Tormen, Giuseppe, Sheth, Ravi K., Baso, Giacomo, and Moscardini, Lauro

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Dark matter, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Cosmology, Virial theorem, symbols.namesake, 0103 physical sciences, Cosmology: theory, Galaxies: haloes, Methods: numerical, astro-ph.CO, Space and Planetary Science, Astronomy and Astrophysics, Planck, Galaxies: haloe, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, 010308 nuclear & particles physics, Halo mass function, Virial mass, Redshift, [SDU]Sciences of the Universe [physics], symbols, Halo, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The abundance of galaxy clusters can constrain both the geometry and growth of structure in our Universe. However, this probe could be significantly complicated by recent claims of nonuniversality -- non-trivial dependences with respect to the cosmological model and redshift. In this work we analyse the dependance of the mass function on the way haloes are identified and establish if this can cause departures from universality. In order to explore this dependance, we use a set of different N-body cosmological simulations (Le SBARBINE simulations), with the latest cosmological parameters from the Planck collaboration; this first suite of simulations is followed by a lower resolution set, carried out with different cosmological parameters. We identify dark matter haloes using a Spherical Overdensity algorithm with varying overdensity thresholds (virial, 2000rho_c, 1000rho_c, 500rho_c, 200rho_c and 200rho_b) at all redshifts. We notice that, when expressed in term of the rescaled variable nu, the mass functionfor virial haloes is a nearly universal as a function of redshift and cosmology, while this is clearly not the case for the other overdensities we considered. We provide fitting functions for the halo mass function parameters as a function of overdensity, that allow to predict, to within a few percent accuracy, the halo mass function for a wide range of halo definitions, redshifts and cosmological models. We then show how the departures from universality associated with other halo definitions can be derived by combining the universality of the virial definition with the expected shape of the density profile of halos., 22 pages, 21 figures, accepted for publication in MNRAS - some changes with respect to the previous version and a new appendix

Published
2016

3. Non-linearity and environmental dependence of the star-forming galaxies main sequence

Author

Paola Popesso, F. Ziparo, Jeffrey A. Newman, G. Erfanianfar, N. Brandt, Andrea Biviano, S. Berta, H. Aussel, Albrecht Poglitsch, D. Wilman, M. Mirkazemi, Francesca Pozzi, Benjamin Magnelli, Mark Dickinson, Raanan Nordon, E. Le Floc'h, Kirpal Nandra, O. Ilbert, D. Fadda, D. Elbaz, Alexis Finoguenov, Andrea Cimatti, John S. Mulchaey, M. C. Cooper, R. M. Bielby, Nico Cappelluti, Masaomi Tanaka, L. Morselli, Dieter Lutz, Mara Salvato, Franz E. Bauer, M. B. Altieri, Stijn Wuyts, Max-Planck-Institut für Extraterrestrische Physik (MPE), Excellence Cluster Universe, excellence cluster centre, INAF - Osservatorio Astronomico di Trieste (OAT), Istituto Nazionale di Astrofisica (INAF), 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), National Optical Astronomy Observatory (NOAO), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Durham University, INAF - Osservatorio Astronomico di Bologna (OABO), AUTRES, 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), University of Bologna/Università di Bologna, Erfanianfar, G., Popesso, P., Finoguenov, A., Wilman, D., Wuyts, S., Biviano, A., Salvato, M., Mirkazemi, M., Morselli, L., Ziparo, F., Nandra, K., Lutz, D., Elbaz, D., Dickinson, M., Tanaka, M., Altieri, M.B., Aussel, H., Bauer, F., Berta, S., Bielby, R.M., Brandt, N., Cappelluti, N., Cimatti, A., Cooper, M.C., Fadda, D., Ilbert, O., Le Floch, E., Magnelli, B., Mulchaey, J.S., Nordon, R., Newman, J.A., Poglitsch, A., Pozzi, F., 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), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), University of Bologna, and NOAO

Subjects
Infrared: galaxie, haloes [Galaxies], FOS: Physical sciences, Astrophysics, Galaxies: groups: general, Astrophysics::Cosmology and Extragalactic Astrophysics, star formation [Galaxies], 01 natural sciences, evolution [Galaxy], Peculiar galaxy, galaxies [Infrared], Galaxy group, 0103 physical sciences, Disc, Galaxies: haloe, 010303 astronomy & astrophysics, Lenticular galaxy, Galaxy: structure, Galaxy cluster, Astrophysics::Galaxy Astrophysics, Luminous infrared galaxy, Physics, Galaxy: evolution, Galaxies: star formation, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, Quasar, Astronomy and Astrophysic, Astrophysics - Astrophysics of Galaxies, groups: general [Galaxies], 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Elliptical galaxy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], structure [Galaxy]
Abstract

Using data from four deep fields (COSMOS, AEGIS, ECDFS, and CDFN), we study the correlation between the position of galaxies in the star formation rate (SFR) versus stellar mass plane and local environment at $z10^{10.4-10.6}$ $M_{\odot}$), across all environments. At high redshift ( $0.5, Comment: 14 pages, 14 figures, accepted for publication in MNRAS

Published
2016

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