Constraints on the [Omega_Matter-Omega_Lambda]-plane from Elliptical\n Galaxy Counts ?

2002/01/23 by Simon P. Driver, Driver, Simon P.
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.48550/arxiv.astro-ph/0201396

Contributed article for "A New Era in Cosmology", Eds T. Shanks & N. Metcalfe, (Publ: ASP)

arxiv created 2002/01/23 · openalex publication_date 2002/01/23 · arxiv updated 2009/12/01 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28

Abstract

Here we present a pilot study into whether elliptical galaxy counts alone,\ncan place a useful constraint on the Omega_M - Omega_Lambda-plane. The\nelliptical galaxy counts are drawn from three surveys: The Millennium Galaxy\nCatalogue (16 > B_KPNO > 20), the B-band Parallel Survey (20 > B_AB >24) and\nthe Hubble Deep Fields (23 > B_AB > 28). The elliptical luminosity function\nused in the modeling was derived from a combination of the Millennium Galaxy\nCatalogue, the two-degree field galaxy redshift survey and the Sloan Digital\nSky Survey (M_*=-19.90, phi_*=0.0019/Mpc³ and alpha =-0.75 for\nH_o=75km/s/Mpc). We adopt a benchmark model and tweak the various input\nparameters by their uncertainties to determine the impact upon the counts. We\nfind that IF the faint-end slope of the elliptical galaxy luminosity function\nis known to better than 0.1, then over the magnitude range 16 < B < 23 the\ncounts depend most critically upon the cosmology, and can be used to place a\nweak constraint on the [Omega_Matter-Omega_Lambda]-plane.\n

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