A method to search for topological signatures in the angular distribution of cosmic objects

Free access article

Issue		A&A Volume 445, Number 3, January III 2006


Page(s)		795 - 804
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:20041950

A&A 445, 795-804 (2006)
DOI: 10.1051/0004-6361:20041950

A method to search for topological signatures in the angular distribution of cosmic objects

A. Bernui and T. Villela

Instituto Nacional de Pesquisas Espaciais, Divisão de Astrofísica, Av. dos Astronautas 1758, 12227-010, São José dos Campos, SP, Brazil
e-mail: [bernui;thyrso]@das.inpe.br

(Received 5 September 2004 / Accepted 30 September 2004 )

Abstract
We present a method to search for large angular-scale correlations, termed topological signatures, in the angular distribution of cosmic objects, which does not depend on cosmological models or parameters and is based only on the angular coordinates of the objects. In order to explore Cosmic Microwave Background temperature fluctuations data, we applied this method to simulated distributions of objects in thin spherical shells located in three dif ferent multiply-connected Euclidean 3-spaces (T³, $T_{\pi}$ , and G₆), and found that the topological signatures due to these topologies can be revealed even if their intensities are small. We show how to detect such signatures for the cases of full-sky and partial-sky distributions of objects. This method can also be applied to other ensembles of cosmic objects, like galaxies or quasars, in order to reveal possible angular-scale correlations in their distributions.

Key words: cosmology -- cosmology: large-scale structure of Universe -- cosmology: cosmic microwave background -- methods: data analysis

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.