Redshift-space limits of bound structures
| dc.creator | Dünner, Rolando | |
| dc.creator | Reisenegger, Andreas | |
| dc.creator | Meza, Andrés | |
| dc.creator | Araya, Pablo A. | |
| dc.creator | Quintana, Hernán | |
| dc.date | 2006-11-14 | |
| dc.date | 2007-02-26 | |
| dc.date.accessioned | 2026-07-07T10:20:49Z | |
| dc.date.available | 2026-07-07T10:20:49Z | |
| dc.description | 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. | |
| dc.description | Contains 12 pages, 12 figures and 8 tables | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0611435 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0611435 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.376:1577-1587,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2007.11550.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/174973 | |
| dc.subject | Astrophysics | |
| dc.title | Redshift-space limits of bound structures | |
| dc.type | text |