superclusters as future “island universes” – the case of shapley

of 19 /19
Superclusters as future “island universes” – the case of Shapley Andreas Reisenegger PUC / ESO Theory/simulations: Rolando Dünner (PUC) Andrés Meza (UChile/UNAB) Pablo A. Araya (Groningen) Observations: Hernán Quintana (PUC) Dominique Proust (Meudon) E. Rodrigo Carrasco (Gemini)

Author: penelope-duncan

Post on 31-Dec-2015

16 views

Category:

Documents


0 download

Embed Size (px)

DESCRIPTION

Superclusters as future “island universes” – the case of Shapley. Andreas Reisenegger PUC / ESO. Theory/simulations: Rolando Dünner (PUC) Andrés Meza (UChile/UNAB) Pablo A. Araya (Groningen). Observations: Hernán Quintana (PUC) Dominique Proust (Meudon) E. Rodrigo Carrasco (Gemini) - PowerPoint PPT Presentation

TRANSCRIPT

  • Superclusters as future island universes the case of ShapleyAndreas ReiseneggerPUC / ESOTheory/simulations:Rolando Dnner (PUC)Andrs Meza (UChile/UNAB)Pablo A. Araya (Groningen)Observations:Hernn Quintana (PUC)Dominique Proust (Meudon)E. Rodrigo Carrasco (Gemini)+ several others

  • OutlineSuperclusters, ShapleySuperclusters?Future of structure in CDM cosmologySpherical collapse, gravitational bindingRedshift-space appearanceSupercluster boundaries & massesFuture plans

  • F2MASS Galactic chart

  • Shapley Supercluster:Redshift catalog ofProust et al. 2006

  • Shapley Supercluster:Redshift catalog ofProust et al. 2006

  • Superclusters?What is a supercluster?What are its boundaries?

    So far, definitions have beenVague: agglomeration of galaxies or clusters, orArbitrary: some overdensity, orVery technical: largest non-percolating structures.

    NOT physical

  • CDM CosmologyInitially matter-dominated: hierarchical growth of structure up to clusters of galaxies (so far)Now, is taking over: expansion accelerates! (supernovae)bound structures separate from each otherstructure formation stopsSome structures are dense enough to locally dominate over , but not yet virializedwill collapse within the next Hubble time or solargest bound structures in the Universephysical definition of superclusters

  • Pablo A. Araya,PhD Thesis(Groningen), in preparation

  • Pablo A. Araya, PhD Thesis (Groningen), in preparationPresent(a=1)Distant future(a=100)

  • Spherical modelEquation of motion for a mass shell:Analytical solution for the critical (marginally bound) shell: (Dnner et al. 2006, MNRAS, 366, 803)

  • Spherical overdensity criterion vs. simulations28%72%0.26%Dnner et al. 2006

  • Radial velocity profileDnner et al. 2006

  • Real space vs. redshift spaceDnner et al., submitted (astro-ph/0611435)

  • Bound structures in redshift spaceVelocity envelopes derived through spherical collapse from density profiles of simulated structuresDnner et al., submitted (astro-ph/0611435)Radial velocity from:true density profile (solid)NFW density profile (dashed)simulation (dots: bound=green, unbound=blue)

  • Redshift-space boundaryShape is velocity envelope from:True density profile (black, solid)NFW profile + spherical collapse (dashed, red & green)Calibrate redshift-space density through simulations to be able to fit to observed dataDnner et al., submitted (astro-ph/0611435)

  • The boundaries of ShapleyDnner et al., in preparation

  • Supercluster massesDnner et al., in preparationPablo A. Araya, PhD Thesis (Groningen), in preparation

  • Near futureVerify spherical collapse model through Dn- distances to individual clusters in Shapley (Magellan proposal: Quintana, Reisenegger, Melnick, Selman, ...).Claimed disagreement of predicted vs. observed supercluster mass function (Einasto et al. 2006): verify through redshift-space analysis of simulations vs. SDSS or 2dFGRS.Improve & compare mass determination methods in simulations & in Shapley.Center for the Exploration of Superclusters of Galaxies (CESGA): Milenio proposal, in 2nd round of evaluation.