EDP Sciences
Free access
Volume 404, Number 1, June II 2003
Page(s) 47 - 55
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20030487

A&A 404, 47-55 (2003)
DOI: 10.1051/0004-6361:20030487

Cosmology at low redshifts

E. F. Borra

Département de Physique, de Génie Physique et d'Optique, Université Laval, Canada G1K 7P4
(Received 4 November 2002 / Accepted 13 February 2003)

It is argued that it is far more cost effective to carry out some projects with medium-sized dedicated zenith telescopes rather than large steerable telescopes, freeing the later to carry out projects that truly need them. I show that the large number of objects observed with a surveying 4-m zenith telescope allows one to carry out cosmological projects at low redshifts. Examining two case studies, I show first that a variability survey would obtain light curves for several thousands of type Ia supernovae per year up to z=1 and easily discriminate among competing cosmological models. Finally, I discuss a second case study, consisting of a spectrophotometric survey carried out with interference filters, showing its power to discriminate among cosmological models and to study the large-scale distribution of galaxies in the Universe.

Key words: telescopes -- instrumentation: miscellaneous -- cosmology: observations

© ESO 2003