On the Number of Galaxies at High Redshift

Galaxies

Lorenzo Zaninetti¹ 

[1] Dipartimento di Fisica, Università degli Studi di Torino, via P.Giuria 1, Turin I-10125, Italy; E-Mail

关键词: cosmology;    observational cosmology;    distances;    redshifts;    radial velocities;    spatial distribution of galaxies;    magnitudes and colors;    luminosities;   

DOI  :  10.3390/galaxies3030129

来源: mdpi

【 摘 要 】

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 . These three tests show minimal differences between the standard and the non-standard models.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.