Recently, it has been shown that it is possible to reconstruct the projected mass distribution of a cluster from weak lensing provided that both the geometry of the universe and the probability distribution of galaxy redshifts are known; actually, when additional photometric data are taken to be available, the galaxy redshift distribution could be determined jointly with the cluster mass from the weak lensing analysis. In this paper we develop, in the spirit of a ``thought experiment,'' a method to constrain the geometry of the universe from weak lensing, provided that the redshifts of the source galaxies are measured. The quantitative limits and merits of the method are discussed analytically and with a set of simulations, in relation to point estimation, interval estimation, and test of hypotheses for homogeneous Friedmann-Lema\^\i tre models. The constraints turn out to be significant when a few thousand source galaxies are used.

Weak lensing and cosmology / M. Lombardi, G. Bertin. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 342:2(1999 Feb), pp. 337-352.

Weak lensing and cosmology

M. Lombardi
Primo
;
G. Bertin
Ultimo
1999-02

Abstract

Recently, it has been shown that it is possible to reconstruct the projected mass distribution of a cluster from weak lensing provided that both the geometry of the universe and the probability distribution of galaxy redshifts are known; actually, when additional photometric data are taken to be available, the galaxy redshift distribution could be determined jointly with the cluster mass from the weak lensing analysis. In this paper we develop, in the spirit of a ``thought experiment,'' a method to constrain the geometry of the universe from weak lensing, provided that the redshifts of the source galaxies are measured. The quantitative limits and merits of the method are discussed analytically and with a set of simulations, in relation to point estimation, interval estimation, and test of hypotheses for homogeneous Friedmann-Lema\^\i tre models. The constraints turn out to be significant when a few thousand source galaxies are used.
Cosmology: dark matter; Cosmology: gravitational lensing; Cosmology: observations; Galaxies: clusters: general; Galaxies: distances and redshifts
Settore FIS/05 - Astronomia e Astrofisica
http://adsabs.harvard.edu/abs/1999A%26A...342..337L
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/188945
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? ND
social impact