Galaxy forecasting of current and upcoming galaxy surveys

In the analysis of cosmological probes, the shear and redshifts of galaxies are the essential quantities. However, in determining the redshifts of observed galaxies we are facing some problems. For current and upcoming surveys, it is too cost- and time-intensive to measure the redshifts using spectroscopy, which is the most accurate way. Another possibility is to use photometric redshift measurements. Here, the problem is that the precision is very low. Furthermore, the astrophysical community has access to a lot of public high-quality data and each set has different constraining power. This opens the question of how to combine these data to get better constraints. In my talk, I will show how we can simulate and recover observed galaxy catalogues of different surveys and how to use this to find the optimal combination of surveys to have small uncertainties in galaxy properties and redshifts. For this, we will take a look at sampling absolute magnitudes and redshifts from the Schechter Luminosity function. Also, we combine this with a simple spectrum model to obtain measured quantities like apparent magnitudes and colours. With these tools, we are able to investigate the sensitivity and constraining power of different galaxy surveys and can test what combination of data has the ability to get better constraints on galaxy properties and redshifts.