Galaxy formation in Lambda greater than 0 Friedmann models: Consequences for the number counts versus redshift test

Details Galaxy formation in Lambda greater than 0 Friedmann models: Consequences for the number counts versus redshift test Galaxy formation in Lambda greater than 0 Friedmann models: Consequences for the number counts versus redshift test

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421l..67m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 421, no. 2, p. L67-L70

Statistics

Applications

4

Applications Of Mathematics, Big Bang Cosmology, Large Space Structures, Perturbation, Star Formation, Cosmic Background Explorer Satellite, Hubble Constant, Luminosity, Red Shift, Space Density

Scientific paper

We study the effect of the cosmological constant Lambda on galaxy formation using a simple spherical top-hat overdensity model. We consider models with Omega0 = 0.2, lambda0 = 0, and Omega0 = 0.2, lambda0 = 0.8 (where Omega0 is the density parameter, and lambda0 identically equal Lambda/3 H0 exp 2 where H0 is the Hubble constant). We adjust the initial power spectrum amplitude so that both models reproduce the same large-scale structures. The galaxy formation era in the lambda0 = 0 model occurs early (z approximately 6) and is very short, whereas in the lambda0 = 0.8 model the galaxy formation era starts later (z approximately 4), and last much longer, possibly all the way to the present. Consequently, galaxies at low redshift (z less than 1) are significantly more evolved in the lambda0 = 0 model than in the lambda0 = 0.8 model. This result implies that previous attempts to determine Lambda using the number counts versus redshift test are probably unreliable.

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