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Galaxies 2015, 3(3), 129-155; doi:10.3390/galaxies3030129

On the Number of Galaxies at High Redshift

Dipartimento di Fisica, Università degli Studi di Torino, via P.Giuria 1, Turin I-10125, Italy
Academic Editor: Emilio Elizalde
Received: 6 March 2015 / Revised: 27 August 2015 / Accepted: 28 August 2015 / Published: 3 September 2015
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Abstract

The number of galaxies at a given flux as a function of the redshift, z, is derived when the z-distance relation is non-standard. In order to compare different models, the same formalism is also applied to the standard cosmology. The observed luminosity function for galaxies of the zCOSMOS catalog at different redshifts is modeled by a new luminosity function for galaxies, which is derived by the truncated beta probability density function. Three astronomical tests, which are the photometric maximum as a function of the redshift for a fixed flux, the mean value of the redshift for a fixed flux, and the luminosity function for galaxies as a function of the redshift, compare the theoretical values of the standard and non-standard model with the observed value. The tests are performed on the FORS Deep Field (FDF) catalog up to redshift z = 1.5 and on the zCOSMOS catalog extending beyond z = 4. These three tests show minimal differences between the standard and the non-standard models. View Full-Text
Keywords: cosmology; observational cosmology; distances, redshifts, radial velocities, spatial distribution of galaxies; magnitudes and colors, luminosities cosmology; observational cosmology; distances, redshifts, radial velocities, spatial distribution of galaxies; magnitudes and colors, luminosities
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zaninetti, L. On the Number of Galaxies at High Redshift. Galaxies 2015, 3, 129-155.

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