Redshift-space limits of bound structures

Details Redshift-space limits of bound structures Redshift-space limits of bound structures

2006-11-14

arxiv.org/abs/astro-ph/0611435v2

Mon.Not.Roy.Astron.Soc.376:1577-1587,2007

Astronomy and Astrophysics

Astrophysics

Contains 12 pages, 12 figures and 8 tables

Scientific paper

10.1111/j.1365-2966.2007.11550.x

An exponentially expanding Universe, possibly governed by a cosmological constant, forces gravitationally bound structures to become more and more isolated, eventually becoming causally disconnected from each other and forming so-called "island universes". This new scenario reformulates the question about which will be the largest structures that will remain gravitationally bound, together with requiring a systematic tool that can be used to recognize the limits and mass of these structures from observational data, namely redshift surveys of galaxies. Here we present a method, based on the spherical collapse model and N-body simulations, by which we can estimate the limits of bound structures as observed in redshift space. The method is based on a theoretical criterion presented in a previous paper that determines the mean density contrast that a spherical shell must have in order to be marginally bound to the massive structure within it. Understanding the kinematics of the system, we translated the real-space limiting conditions of this "critical" shell to redshift space, producing a projected velocity envelope that only depends on the density profile of the structure. From it we created a redshift-space version of the density contrast that we called "density estimator", which can be calibrated from N-body simulations for a reasonable projected velocity envelope template, and used to estimate the limits and mass of a structure only from its redshift-space coordinates.

Affiliated with

Also associated with

No associations

Rating

Redshift-space limits of bound structures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Redshift-space limits of bound structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Redshift-space limits of bound structures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-487520