Removing Imaging Systematics from Galaxy Clustering Measurements with Obiwan : Application to the SDSS-IV extended Baryon Oscillation Spectroscopic Survey Emission Line Galaxy Sample

Understand

This work presents the application of a new tool, Obiwan , which uses image simulations to determine the selection function of a galaxy redshift survey and calculate 3-dimensional (3D) clustering statistics.

• This is a forward model of the process by which images of the night sky are transformed into a 3D large--scale structure catalog.
• The photometric pipeline automatically detects and models galaxies and then generates a catalog of such galaxies with detailed information for each one of them, including their location, redshift and so on.
• Systematic biases in the imaging data are therefore imparted into the catalogs and must be accounted for in any scientific analysis of their information content.