Rotation curve decompositions with Gaussian Processes: taking into account data correlations leads to unbiased results

Correlations between velocity measurements in disk galaxy rotation curves are usually neglected when fitting dynamical models. Here I show how data correlations can be taken into account in rotation curve decompositions using Gaussian Processes. I find that marginalizing over correlation parameters proves critical to obtain unbiased estimates of the luminous and dark matter distributions in galaxies.
Comment: 4 pages, 1 figure. Published in RNAAS. Associated jupyter notebook at https://lposti.github.io/MLPages/gaussian_processes/2022/11/02/gp_rotcurves.html