EDP Sciences
Free access
Issue A&A
Volume 448, Number 2, March III 2006
Page(s) 439 - 446
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20053526

A&A 448, 439-446 (2006)
DOI: 10.1051/0004-6361:20053526

The excursion set approach, and an improved model for the multiplicity function

A. Del Popolo1, 2, 3

1  Dipartimento di Matematica, Università Statale di Bergamo, via dei Caniana 2, 24127 Bergamo, Italy
2  Bo $\rm {\breve{g}azi}$çi University, Physics Department, 80815 Bebek, Istanbul, Turkey
    e-mail: antonino.delpopolo@boun.edu.tr
3  Istanbul Technical University, Ayazaga Campus, Faculty of Science and Letters, 34469 Maslak/Istanbul, Turkey

(Received 27 May 2005 / Accepted 18 October 2005 )

Abstract
I compare numerical multiplicity function with the theoretical multiplicity function obtained by means of the excursion set model and an improved version of the barrier shape which implicitly takes account of total angular momentum acquired by the proto-structure during evolution and of a non-zero cosmological constant. I describe the better agreement of the multiplicity function obtained in this paper with simulations of other previous models. While the theoretical multiplicity function of the present paper is in agreement with high resolution N-body simulations, the comparison of the theoretical multiplicity function of the present paper with the theoretical multiplicity function of several authors shows some discrepancies: e.g., the maximum value of the multiplicity function from simulations at $\nu \sim 1$ is smaller, and its low mass tail is shallower when compared with the ST multiplicity function.

The multiplicity function of the present paper gives a good fit to simulations results and was obtained from a sound theoretical background.


Key words: cosmology: theory -- large-scale structure of Universe -- galaxies: formation





© ESO 2006

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.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)