Lifting cosmic degeneracy within a single quasar survey

¹ 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

Received: 8 September 2000
Accepted: 19 October 2000

Abstract

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.