Quantify and constrain the evolution in the galaxy populations.Compare galaxies today with galaxies in the past.To investigate the evolution of galaxies.investigate optical mix of morphological types.To investigate the contribution of different galaxy populations to the Universe.low density / cosmological constant faster expansion larger volumes more galaxies.Faint source counts depend on the geometry of the Universe. To determine the Geometry of the Universe.Fainter and fainter galaxies at higher and higher redshift.To count the numbers of galaxies in the Universe.Insensibly one begins to twist facts to suit theories instead of theories to suit facts.” - Sherlock Holmes.Ĭhris Pearson : Observational Cosmology 6: Galaxy Number Counts - ISAS -2004 6.1: Why Study Source Counts Why Study Source Counts - How many galaxies are there in the Universe ? Why Study Galaxy Source Counts ? Galaxy Number Counts “It is a capital mistake to theorise before one has data. Chris Pearson : Observational Cosmology 6: Galaxy Number Counts - ISAS -2004 Observational Cosmology: 6.
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