Distribution of galaxies at large redshift and cosmological parameters from the magnification bias in Cl0024+1654

Details Distribution of galaxies at large redshift and cosmological parameters from the magnification bias in Cl0024+1654 Distribution of galaxies at large redshift and cosmological parameters from the magnification bias in Cl0024+1654

1996-06-06

arxiv.org/abs/astro-ph/9606039v1

Astronomy and Astrophysics

Astrophysics

Latex, 11 pages, l-aa.sty and psfig.sty, 10 figures. 187K gzipped tar file. Submitted to Astronomy & Astrophysics Main Journal

Scientific paper

We analyse the surface density of very faint galaxies at the limit of the sky background noise in the field of the cluster of galaxies Cl0024+1654. The radial variation of their number density in the magnitude bins $B=26-28$ and $I=24-26.5$ displays an (anti)bias magnification effect for $I < 24$ which provides the redshift range of the populations seen in $B$ and $I$. The depletion curve can be reproduced with two redshift populations with $60\% \pm 10\%$ of the $B$ galaxies between $z=0.9$ and $z=1.1$ and the remaining at a redshift close to $z=3$. The $I$ selected population is similar but with a minimum extending from the $B$ inner critical line to $R_I=60"$. Whatever the cosmological model, the $I$-selected galaxies spread up to a larger redshift with about 20\% above $z > 4$. Using a model for the gravitational potential, the locations of the two extreme critical lines for the B and I galaxies favour $\Omega_{\Lambda}$-dominated flat universes with a cosmological constant ranging from 0.6 to 0.9. The result is confirmed by a preliminary investigation of A370. We discuss the method to search the "last critical line" and the various biases.

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