Two Degree Field Galaxy Redshift Survey and Sloan Digital Sky Survey Galaxy Group Density Profiles

2005 ◽  
Vol 629 (1) ◽  
pp. 158-171 ◽  
Author(s):  
Eugenia Diaz ◽  
Ariel Zandivarez ◽  
Manuel E. Merchan ◽  
Hernan Muriel
Keyword(s):  
Sloan Digital Sky Survey ◽  
Density Profiles ◽  
Sky Survey ◽  
Redshift Survey ◽  
Galaxy Redshift ◽  
Group Density ◽  
Field Galaxy

CONSTRAINT ON THE KINEMATICAL AND DYNAMICAL MODEL FROM THE LATEST OBSERVATIONAL DATA

2010 ◽  
Vol 25 (36) ◽  
pp. 3033-3046 ◽  
Author(s):  
JIANBO LU ◽  
YABO WU ◽  
LIXIN XU
Keyword(s):  
Observational Data ◽  
Acoustic Oscillation ◽  
Sloan Digital Sky Survey ◽  
Dynamical Model ◽  
Sky Survey ◽  
Type Ia ◽  
Redshift Survey ◽  
Galaxy Redshift ◽  
Ia Supernovae ◽  
Field Galaxy

The kinematical model j(z) = j0and dynamical model wde(z) = w0, are constrained from the latest observational data: Union2 data including 557 type Ia supernovae (SNIa), 15 observational Hubble data (OHD), baryon acoustic oscillation (BAO) data from Sloan Digital Sky Survey (SDSS) and Two-degree Field Galaxy Redshift Survey (2dFGRS) and CMB data from seven-year WMAP. We get the current values of deceleration parameter q0, jerk parameter j0, dimensionless matter density Ωm, equation of state for dark energy w0and transition redshift zT. Furthermore, it is shown that for both kinematical and dynamical models, the constraint results support for the cosmic concordance model, ΛCDM.

scholarly journals Measuring the Baryon Acoustic Oscillation scale using the Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey

2007 ◽  
Vol 381 (3) ◽  
pp. 1053-1066 ◽  
Author(s):  
Will J. Percival ◽  
Shaun Cole ◽  
Daniel J. Eisenstein ◽  
Robert C. Nichol ◽  
John A. Peacock ◽  
...  
Keyword(s):  
Acoustic Oscillation ◽  
Sloan Digital Sky Survey ◽  
Baryon Acoustic Oscillation ◽  
Sky Survey ◽  
Redshift Survey ◽  
Galaxy Redshift

scholarly journals The CNOC2 field galaxy redshift survey

1999 ◽  
Vol 357 (1750) ◽  
pp. 167-183 ◽  
Author(s):  
R. G Carlberg ◽  
H. K. C. Yee ◽  
S. L. Morris ◽  
H. Lin ◽  
M. Sawicki ◽  
...  
Keyword(s):  
Redshift Survey ◽  
Galaxy Redshift ◽  
Field Galaxy

scholarly journals Void Dynamics

2014 ◽  
Vol 11 (S308) ◽  
pp. 530-537
Author(s):  
Nelson D. Padilla ◽  
Dante Paz ◽  
Marcelo Lares ◽  
Laura Ceccarelli ◽  
Diego Garcí a Lambas ◽  
...  
Keyword(s):  
Dark Matter ◽  
Correlation Functions ◽  
Cross Correlation ◽  
Cosmological Parameters ◽  
Matter Field ◽  
Sloan Digital Sky Survey ◽  
Density Profiles ◽  
Peculiar Velocities ◽  
Sky Survey ◽  
Space Data

AbstractCosmic voids are becoming key players in testing the physics of our Universe. Here we concentrate on the abundances and the dynamics of voids as these are among the best candidates to provide information on cosmological parameters. Cai, Padilla & Li (2014) use the abundance of voids to tell apart Hu & Sawicki f(R) models from General Relativity. An interesting result is that even though, as expected, voids in the dark matter field are emptier in f(R) gravity due to the fifth force expelling away from the void centres, this result is reversed when haloes are used to find voids. The abundance of voids in this case becomes even lower in f(R) compared to GR for large voids. Still, the differences are significant and this provides a way to tell apart these models. The velocity field differences between f(R) and GR, on the other hand, are the same for halo voids and for dark matter voids. Paz et al. (2013), concentrate on the velocity profiles around voids. First they show the necessity of four parameters to describe the density profiles around voids given two distinct void populations, voids-in-voids and voids-in-clouds. This profile is used to predict peculiar velocities around voids, and the combination of the latter with void density profiles allows the construction of model void-galaxy cross-correlation functions with redshift space distortions. When these models are tuned to fit the measured correlation functions for voids and galaxies in the Sloan Digital Sky Survey, small voids are found to be of the void-in-cloud type, whereas larger ones are consistent with being void-in-void. This is a novel result that is obtained directly from redshift space data around voids. These profiles can be used to remove systematics on void-galaxy Alcock-Pacinsky tests coming from redshift-space distortions.

scholarly journals Real-space density profile reconstruction of stacked voids

2014 ◽  
Vol 11 (S308) ◽  
pp. 546-550
Author(s):  
Alice Pisani ◽  
P. Sutter ◽  
G. Lavaux ◽  
B. Wandelt
Keyword(s):  
Large Scale ◽  
New Physics ◽  
Real Space ◽  
Sloan Digital Sky Survey ◽  
High Quality ◽  
Density Profiles ◽  
Peculiar Velocities ◽  
Sky Survey ◽  
Cosmic Voids ◽  
Profile Reconstruction

AbstractModern surveys allow us to access to high quality large scale structure measurements. In this framework, cosmic voids appear as a new potential probe of Cosmology. We discuss the use of cosmic voids as standard spheres and their capacity to constrain new physics, dark energy and cosmological models. We introduce the Alcock-Paczyński test and its use with voids. We discuss the main difficulties in treating with cosmic voids: redshift-space distortions, the sparsity of data, and peculiar velocities. We present a method to reconstruct the spherical density profiles of void stacks in real space, without redshift-space distortions. We show its application to a toy model and a dark matter simulation; as well as a first application to reconstruct real cosmic void stacks density profiles in real space from the Sloan Digital Sky Survey.

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