Volume 366, Number 1, January IV 2001
|Page(s)||1 - 6|
|Published online||15 January 2001|
Lifting cosmic degeneracy within a single quasar survey
Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune, 411 007, India
2 Institut d'Astrophysique de Paris (CNRS UPR 341), 98bis Bd Arago, 75014 Paris, France
3 DAEC (CNRS UMR 8631), Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France
B. F. Roukema
Accepted: 19 October 2000
In the almost Friedmann-Lemaître model of the Universe, the density parameter, , and the cosmological constant, , measure curvature. Several linearly degenerate relations between these two parameters have recently been measured. Here, large scale structure correlations at h-1 Mpc are found in the comoving three-dimensional separations of redshift quasars. These function as a comoving standard rod of length h-1 Mpc. A local maximum in the correlation function at also appears to be significant. By combining separate radial and tangential standard ruler analyses, the lifting of the linear degeneracy within a single data set is demonstrated for the first time.
Key words: cosmology: observations / cosmology: theory / distance scale / quasars: general / large-scale structure of Universe / reference systems
© ESO, 2001
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